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Ionic liquid functionalized resins for highly efficient separation and purification of rare earth elements and thorium 认领 引用 被引量：1
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作者 Jinming Du Hao Zhang +4 位作者 Xiaojing Li Qiyong Deng Hongye Wang Zhigang Zhao Fan Yang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第4期1244-1253,I0008,共10页
In this study,thiodiglycolamic acid-immobilized resin(SLCT-TDGA)and methyltri-n-octyl ammonium thiodiglycolamate ionic liquid functionalized resin([A336][SLCT-TDGA])were synthesized by chemical synthesis and ion excha... In this study,thiodiglycolamic acid-immobilized resin(SLCT-TDGA)and methyltri-n-octyl ammonium thiodiglycolamate ionic liquid functionalized resin([A336][SLCT-TDGA])were synthesized by chemical synthesis and ion exchange methods.The synthesized resins were used for the removal and enrichment of thorium in rare earths.The experimental findings demonstrate that the ionic liquefaction-modified resin[A336][SLCT-TDGA]exhibits a substantial enhancement in adsorption rate(2 h),adsorption capacity(23.66 mg/g),and selectivity in comparison to the grafted resin SLCT-TDGA.When separating thorium and rare earth by using[A336][SLCT-TDGA]resin,the separation factors areβTh/La=10942,βTh/Sm=6959,βTh/Gd=5255,βTh/Lu=3491,and are at the forefront of the resin field.Furthermore,the adsorption performance decreases by only 0.7%after five cycles.The[A336][SLCT-TDGA]resin was tested with a simulated leaching solution of southern ion-adsorbed rare earth elements,reducing the thorium concentration from 6.07 to 0.0086 mg/L,achieving a removal rate of 99.86%.Meanwhile,the loss rate of rare earth elements is only 1.08%. 展开更多
关键词 Rare earths Thorium Selective adsorption Ionic liquefaction resin Amide acid
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Fluorene chemistry as a design platform for polymeric HTLs:Substituent control and core linkages in perovskite photovoltaics 认领 引用
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作者 Yujin Li Paramaguru Ganesan +2 位作者 Abd Rashid bin Mohd Yusoff Simonetta Orlandi Peng Gao 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2026年第3期107-144,共38页
Polymeric hole transport layers(HTLs)are emerging as one of the most promising classes of hole transporting materials for inverted(p-i-n)perovskite solar cells,offering tunable molecular design,reliable film formation... Polymeric hole transport layers(HTLs)are emerging as one of the most promising classes of hole transporting materials for inverted(p-i-n)perovskite solar cells,offering tunable molecular design,reliable film formation,and potential for scalable processing.Within this class,fluorene-based polymers stand out due to their rigidπ-conjugated backbone,which imparts thermal stability and optical transparency,and the unique C9 substitution site,which enables precise control over solubility,morphology,interfacial chemistry,and energy alignment.By linking the fluorene core with alkyl,functionalized alkyl,vinylene,biphenyl/spiro,or in situ crosslinkable motifs,researchers have created a diverse family of HTLs that balance mobility,stability,and manufacturability.Recent studies show that well-engineered fluorene polymers can deliver power conversion efficiencies(PCEs)above 20%and retain over 90%of their initial performance after 1000 h of operational stress.Despite advances,challenges remain,as fabrication and stability inconsistencies hinder comparison,and few fluorene-based sys-tems combine efficiency,stability,and scalability.Bridging this gap will require systematic mapping of C9 substitution patterns to device metrics,hybrid designs that merge complementary traits,and ISOS-compliant benchmarking.This review provides a unifying framework to guide the development of next-generation fluo-rene-based polymeric HTLs for durable,commercially viable perovskite photovoltaics. 展开更多
关键词 Fluorene polymers Polymeric HTLs Inverted PSCs C9 substitution In situ polymerisation Anchoring groups
Rapid and Green Mechanochemical Synthesis of UTSA-16(Zn)for High-Performance CO2Capture 认领 引用
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作者 Wang Zhitao Lin Yuke +5 位作者 Wan Yan Huang Xinwei Li Yunbin Ji Dinghao Xiang Shengchang Zhang Zhangjing 《化学学报》 SCIE CAS CSCD 北大核心 2026年第5期631-637,共7页
Addressing the pressing challenge of high energy consumption and solvent waste in the industrial-scale production of metal-organic frameworks(MOFs),we report a rapid,green,and scalable mechanochemical strategy for the... Addressing the pressing challenge of high energy consumption and solvent waste in the industrial-scale production of metal-organic frameworks(MOFs),we report a rapid,green,and scalable mechanochemical strategy for the mass preparation of the highly efficient CO2 adsorbent,UTSA-16(Zn).Unlike conventional solvothermal methods,this protocol using zinc acetate and potassium citrate dramatically shortens the synthesis time from 48 h to just 6 h.This achieves a re markable 48-fold enhancement in space-time yield while reducing solvent consumption by approximately 90%.Crucially,we identify that the in-situ accumulation of acidic byproducts during grinding inhibits framework assembly.Precise pH modula tion using 0.2 equiv.of triethylamine(TEA)is essential to buffer the reaction environment,preventing defect formation and ensuring high product crystallinity.The resulting material is structurally isomorphous to its hydrothermally synthesized counterpart,possessing a consistent pore environment with a high BET surface area of 817 m2/g.In terms of performance,the mechanochemically derived UTSA-16(Zn)exhibits exceptional CO2 uptake(3.68 mmol/g at 296 K and 0.1 MPa)and an ultra-high ideal adsorbed solution theory(IAST)selectivity of 388 for CO2/N2 mixtures,driven by a significant difference in isosteric heats of adsorption.Dynamic breakthrough experiments further validate a robust dynamic CO2 capacity of 1.94 mmol/g and stable recyclability under simulated flue gas conditions.This work not only provides a practical manufacturing route for UTSA-16(Zn)but also underscores the pivotal role of pH regulation in the green synthesis of advanced porous ma terials. 展开更多
关键词 UTSA-16 metal-organic frameworks(MOFs) separation mechanochemical synthesis carbon dioxide capture
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Tailoring the morphology and charge transfer pathways of ultrathin Cd0.8Zn0.2S nanosheets via ionic liquid-modified Ti3C2MXenes towards remarkable photocatalytic hydrogen evolution 认领 引用 被引量：4
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作者 Qianqian Hu Haiyan Yin +5 位作者 Yifan Liu Abdusalam Ablez Zhuangzhuang Wang Yue Zhan Chengfeng Du Xiaoying Huang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第1期47-59,共13页
Small-sized Cdx Zn1-x S solid solution nanomaterial is an important candidate for efficient photocatalytic hydrogen evolution(PHE),but it still suffers from easy agglomeration,severe photo corrosion,and fast pho... Small-sized Cdx Zn1-x S solid solution nanomaterial is an important candidate for efficient photocatalytic hydrogen evolution(PHE),but it still suffers from easy agglomeration,severe photo corrosion,and fast photogenerated electron-hole recombination.To tackle these issues,herein,we propose a new strategy to modify Cdx Zn1-x S nanoreactors by the simultaneous utilization of ionic-liquid-assisted morphology engineering and MXene-incorporating method.That is,we designed and synthesized a novel hierarchi-cal Cd0.8 Zn0.2 S/Ti3 C2 Schottky junction composite through the in-situ deposition of ultrathin Cd0.8 Zn0.2 S nanosheets on unique IL-modified Ti3 C2 MXenes by a one-pot solvothermal method for efficiently PHE.The unique construction strategy tailors the thickness of ultrathin Cd0.8 Zn0.2 S nanosheets and prevents them from stacking and agglomeration,and especially,optimizes their charge transfer pathways during the photocatalytic process.Compared with pristine Cd0.8 Zn0.2 S nanosheets,Cd0.8 Zn0.2 S/Ti3 C2 has abun-dant photogenerated electrons available on the Ti3 C2 surface for proton reduction reaction,owing to the absence of deep-trapped electrons,suppression of electron-hole recombination in Cd0.8 Zn0.2 S and high-efficiency charge separation at the Cd0.8 Zn0.2 S/Ti3 C2 Schottky junction interface.Moreover,the hy-drophilicity,electrical conductivity,visible-light absorption capacity,and surficial hydrogen desorption of Cd0.8 Zn0.2 S/Ti3 C2 heterostructure are significantly improved.As a result,the heterostructure exhibits out-standing photocatalytic stability and super high apparent quantum efficiency,being rendered as one of the best noble-metal-free Cd-Zn-S-based photocatalysts.This work illustrates the mechanisms of mor-phology control and heterojunction construction in controlling the catalytic behavior of photocatalysts and highlights the great potential of the IL-assisted route in the synthesis of high-performance MXene-based heterostructures for photocatalytic hydrogen evolution. 展开更多
关键词 Ionic liquid Ultrathin Cd0.8Zn0.2S nanosheets MXene Schottky junction Photoexcited charge separation Photocatalytic H2evolution
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Selective Lithium Deposition Through 3D Copper Collector With Lithiophilic Alloy“Skins”and Curvature Boundaries for Dendrite-Free Lithium-Metal Anodes 认领 引用
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作者 Meng-Qi Zhu Dong-Xu Ye +5 位作者 Xiao-Yi Teng Yi-Xin Wei Jin-Hao Zhu Xiao-Man Liao Jin-Yan Zhong Jin-Dan Zhang 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期792-800,共9页
Although lithium metal has been regarded as an ideal anode material for high-energy-density batteries,its practical applications remain hindered by many serious challenges.Three-dimensional(3D)porous Cu current collec... Although lithium metal has been regarded as an ideal anode material for high-energy-density batteries,its practical applications remain hindered by many serious challenges.Three-dimensional(3D)porous Cu current collectors demonstrate potential in ensuring uniform Li deposition.However,notable drawbacks of 3D Cu collectors—such as poor lithophilic properties,unordered interface microstructure,and insufficient surface area—still hamper their effectiveness.Herein,a 3D porous Cu skeleton with lithiophilic Cu0.64Zn0.36 alloy“skins”and curvature boundaries(CuZn@Cu)is developed.In CuZn@Cu,the Cu0.64Zn0.36 alloy layer endows the collector with good lithium affinity and low surface reaction activation energy,thereby promoting uniform lithium deposition.In addition,the abundant curvature boundaries in CuZn@Cu regulate the distributions of the electric field and lithium ion flux,guiding the selective nucleation and growth of lithium.Consequently,compact and dendrite-free lithium deposition is achieved on CuZn@Cu,and the CuZn@Cu collector enables a high average Coulombic efficiency of 98.15%in 1000 cycles.The lithium symmetric cells with the CuZn@Cu exhibit a long cycle life of more than 1400 h at1 m A cm-2. 展开更多
关键词 Cu collector curvature boundaries lithiophilic lithium anodes selective deposition
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Structure Characterization and Dephosphorization Effect Analysis of Oyster Shell-silica Micropowder Waste Water Dephosphorization Materials 认领 引用 被引量：2
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作者 赖寿莲 《Chinese Journal of Structural Chemistry》 SCIE CAS 2010年第1期33-38,共6页
In this work,the effects of pH value of waste water and initial concentration of phosphorus on dephosphorization materials were investigated.The materials were prepared by shaping,sintering and hydrothermal reshaping ... In this work,the effects of pH value of waste water and initial concentration of phosphorus on dephosphorization materials were investigated.The materials were prepared by shaping,sintering and hydrothermal reshaping oyster shell and silica micro-powder.Different concentrations of phosphorus-contained waste water were simulated with potassium dihydrogen phosphate solution,the effect of dephosphorization was tested with phosphomolybdenum blue spectrophotometer method,and the crystal phase and microstructure of materials were characterized by XRD and SEM methods. It was indicated that dephosphorization was completed in 6 h when the initial phosphorus concentration in waste water was lower than 15 mg/L, and the dephosphorization time prolonged as the increase of phosphorus concentration. It was observed that the pH value of waste water influenced dephosphorization significantly, and neutral subalkalic environment favored dephosphorization. When the pH value was 11, the efficiency of dephosphozation was the greatest. For waste water with an initial concentration of 20 mg/L, the dephosphozation rate is close to 100% in8 h. 展开更多
关键词 oyster shell silica micro-powder hydrothermal reaction waste water dephosphorization materials environmental-friendly material
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Surface hybrid engineering of nanodiamonds for boosting electrocatalytic hydrogen peroxide production with high efficiency and stability 认领 引用 被引量：1
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作者 Jinli Liu Mo Zhang +4 位作者 Ling Tang Simin Zhang Jiayong Lu Xu Yang Yangming Lin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第10期15-23,共9页
Hydrogen peroxide(H2O2)is an important chemical that can be sustainably produced through a twoelectron pathway in the electrocatalytic oxygen reduction reaction(ORR).However,the high cost and low reaction effici... Hydrogen peroxide(H2O2)is an important chemical that can be sustainably produced through a twoelectron pathway in the electrocatalytic oxygen reduction reaction(ORR).However,the high cost and low reaction efficiency of catalysts currently limit the widespread application of this technology.Developing high-selectivity and scalable catalysts and accurately identifying the reaction active sites remain challenges.In this work,we have developed a promising nanodiamond(ND)catalyst to achieve high-selectivity H2O2production by oxygen reduction.Through surface carbon hybridization regulation to identify specific oxygen-containing functional groups combined with titration,model catalysis and DFT methods,it is found that the presence of carbonyl groups inducing the surrounding carbon atoms exhibit an optimal*OOH adsorption strength,thus promoting the two-electron pathway in ORR.Specifically,dynamic evolution processes of carbonyl groups and key adsorbed intermediate products including O2(ads),superoxide anion*O2-,and *OOH are monitored in situ spectroscopy.In the flowcell device,ND catalyst realizes the high H2O2Faradaic efficiency around 92% with a rate activity up to 105 mol gC=O-1h-1,surpassing among reported non-metallic catalysts.The total H2O2yield reaches to 23.79 m M after a ten-hour test,which is 2.56 times higher than that of carbonyl-passivated ND,demonstrating its potential in scale-up application.Both titration and model catalytic processes proposed in this study further offer methods of designing efficient electrocatalysts for H2O2production. 展开更多
关键词 Metal-free catalysis H2O2electrosynthesis Nanodiamond ORR Active sites Carbonyl groups
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Preparation and Application of Chitosan-based Polyelectrolyte Complex Materials: An Overview 认领 引用
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作者 Yukai Lin Xinyue Wang +1 位作者 Qinghai Liu Yan Fang 《Paper And Biomaterials》 CAS 2022年第4期1-19,共19页
Chitosan,a renewable,non-toxic,and natural cationic polyelectrolyte,can be combined with many anionic polyelectrolytes(such as sodium alginate,hyaluronic acid,xylan,and gelatin)via electrostatic forces to form chitosa... Chitosan,a renewable,non-toxic,and natural cationic polyelectrolyte,can be combined with many anionic polyelectrolytes(such as sodium alginate,hyaluronic acid,xylan,and gelatin)via electrostatic forces to form chitosan-based polyelectrolyte composites under certain conditions.This review summarizes various methods of preparing chitosan-based polyelectrolyte composites and analyzes their applications in clinical medicine and agriculture,as well as pharmaceutical,tissue,food,environmental,and textile engineering fields.The future development direction and potential of chitosan-based polyelectrolytes are also discussed. 展开更多
关键词 natural polymer chitosan polyelectrolyte complex electrostatic action preparation method application research
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Theoretical Study of Energy Transfer between CO and CO2Based on FullDimensional Potential Energy Surface 认领 引用
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作者 Yuquan Feng Yihuang Jiang +1 位作者 Zhengyan Jiang Jun Chen 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2025年第6期875-883,I0239,共9页
We present a comprehensive study of the CO2-CO interaction potential using a 9-dimensional(9D)potential energy surface(PES)constructed with the fundamental invariant-neural networks(FINN)method.The PES was generate... We present a comprehensive study of the CO2-CO interaction potential using a 9-dimensional(9D)potential energy surface(PES)constructed with the fundamental invariant-neural networks(FINN)method.The PES was generated from 65330 CCSD(T)-F12a/aug-cc-pVTZ ab initio data points,with counterpoise correction,applied to eliminate basis set superposition error(BSSE).We performed quasi-classical trajectory simulations using this PES to investigate the rotational energy transfer dynamics.Our results reveal complex energy transfer mechanisms,with significant rotational excitation and relaxation dependent on collision energy and initial rotational states.The 9D PES provides a more accurate representation of the CO2-CO system,offering new insights into molecular dynamics and interaction mechanisms. 展开更多
关键词 CO CO2 Potential energy surface Reaction dynamics Energy transfer
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Ultrafast Joule heating technology for functional nanomaterials synthesis:Recent progress,challenges,and perspectives 认领 引用
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作者 Yuyu Liu Ruting Lin +6 位作者 Baoyi Guo Chen Chen Qiujin Wu Xiaofeng Zhang Qiufeng Huang Ibrahim Saana Amiinu Tingting Liu 《Materials Reports(Energy)》 EI 2025年第4期11-34,共24页
Ultrafast Joule heating(JH)has emerged as a powerful and scalable platform for rapid thermal processing of advanced nanomaterials.By delivering transient,high-intensity electrical pulses,JH induces ultrafast heating a... Ultrafast Joule heating(JH)has emerged as a powerful and scalable platform for rapid thermal processing of advanced nanomaterials.By delivering transient,high-intensity electrical pulses,JH induces ultrafast heating and cooling rates on the order of milliseconds,facilitating nonequilibrium phase transitions,defect modulation,and tailored nanostructural evolution.This technique offers unprecedented control over material synthesis and has been successfully applied to a broad spectrum of functional property-driven materials,including graphene,single-atom catalysts,transition metal carbides,oxides,nitrides,phosphides,and chalcogenides,as well as complex multicomponent frameworks such as high-entropy alloys.This review systematically explores the principles governing JH,highlights recent advances in its application to diverse materials systems,and critically assesses current limitations related to process uniformity,scalability,and mechanistic understanding.Particular attention is given to its intrinsic advantages,including energy efficiency,fast rate,environmental sustainability,and compatibility with sustainable manufacturing.Finally,we propose guidance for expanding the utility of JH for new materials discovery,including integration with in-situ diagnostics,theoretical compatibility and data-driven optimization of synthesis to effectively correlate structure-property relationships. 展开更多
关键词 Electrocatalysis Energy storage and conversion Joule heating Materials synthesis Nanomaterials and ultrafast synthesis
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Molecular tweezers in thiolate-protected Cu(Ⅰ)clusters:A framework platform for investigating ligand effects in cluster catalysis 认领 引用
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作者 Jiaojiao Zhang Yifan Wu +4 位作者 Yifei Li Fuxing Lin Shengchang Xiang Xi Fan Zhangjing Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第6期657-661,共5页
Scarce investigations have focused on coinage metal clusters possessing fixed cores but varying binding ligands in the context of catalysis.Here in this work,we successfully employed two types of carboxylic acid-based... Scarce investigations have focused on coinage metal clusters possessing fixed cores but varying binding ligands in the context of catalysis.Here in this work,we successfully employed two types of carboxylic acid-based molecular tweezers to selectively capture two Cu6clusters(Cu6-a and Cu6-b).Cu6-a and Cu6-b have identical cluster cores but different protected ligands,therefore provide accurate platform for investigating ligand effects in cluster catalysis.Notably,Cu6-b represents a rare example of a two-directional rod framework,marking the first instance of such a structure in coinage metal cluster-based MOFs.The integration of oxygen within OBB significantly enhances local spatial polarization,facilitating the charge separation and ROS generation efficiency of Cu6-b under visible-light irradiation.Consequently,the oxygen-containing Cu6-b exhibits superior photocatalytic performance in the aerobic oxidation of sulfide,achieving both high yield and selectivity.This work provides a valuable approach for precisely control the Cu clusters structures to regulate their properties. 展开更多
关键词 Coinage metal clusters Cu nanoclusters Framework Molecular tweezers Ligand effects
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Rational design of a high-efficiency lead halide organic-inorganic hybrid nonlinear optical switch via molecular engineering 认领 引用
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作者 Xiantan Lin Yicong Lv +6 位作者 Xiaoqi Li Zengshan Yue Kai Li Qingyin Wei Qianxi Wang Junhua Luo Xitao Liu 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第7期702-706,共5页
As an indispensable subset of functional materials,quadratic nonlinear optical(NLO)switches have garnered increasing attention owing to their vast potential in next-generation intelligent optoelectronic devices.Despit... As an indispensable subset of functional materials,quadratic nonlinear optical(NLO)switches have garnered increasing attention owing to their vast potential in next-generation intelligent optoelectronic devices.Despite considerable progress in NLO switches based on solid-state phase transitions,identifying an effective strategy to design high-efficiency NLO switches remains a huge challenge.Herein,we present a molecular engineering approach to develop a high-efficiency lead halide organic-inorganic hybrid NLO switch,(C8H12N)2Pb2Cl6·H2O(NMPTPC).Through the substitution of hydrogen with a methyl group(-CH3)in protonated N-methylaniline,the initial compound(C7H10N)2Pb2Cl6·H2O(NMAPC)transformed into NMPTPC retaining the original space group,which gives rise to a dramatic enhancement of second harmonic generation(SHG)and phase transition temperature.As expected,NMPTPC exhibits highefficiency modulation of the SHG property(2.6 times that of KH2PO4)and a high phase transition temperature of 372 K.Notably,NMPTPC exhibits a remarkable temperature-dependent SHG behavior,with an impressive“ON/OFF”ratio of approximately 70,underscoring its significant potential as a high-efficient solid-state NLO switch.Based on in-depth crystal structure analysis and theoretical calculations,the modulation of the NLO property is attributed to the asymmetric distortion of the[PbCl6]4-octahedra coupled withπ-conjugated aromatic amines with a large dipole moment.This research highlights a promising strategy for advancing the development of high-efficiency NLO switches and provides insights into their applications in next-generation intelligent optoelectronic devices. 展开更多
关键词 Nonlinear optical switch Perovskite Phase transition Second harmonic generation High-efficiency
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Fabrication of Graphene-reinforced Alumina Ceramic Composites via Adsorption-precipitation Self-assembly Combined with Spark Plasma Sintering 认领 引用
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作者 CHENG Aopeng WANG Yuewen +3 位作者 XU Wentao LIU Quanwei ZHANG Haitao ZHOU Youfu 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2026年第4期536-544,I0013-I0015,共9页
Alumina ceramics are widely utilized as structural materials,yet their inherent brittleness and monofunctionality limit their application in high-stress scenarios.Strategic integration of two-dimensional graphene shee... Alumina ceramics are widely utilized as structural materials,yet their inherent brittleness and monofunctionality limit their application in high-stress scenarios.Strategic integration of two-dimensional graphene sheets,characterized by their excellent mechanical,thermal and electrical properties,into ceramic matrix can facilitate grain refinement through interface engineering,thereby achieving performance optimization.Conventional physical blending methods result in poor uniformity and integrity of 2D sheets,thereby impeding advancements in graphene-ceramic composites.Herein,a novel adsorption-precipitation self-assembly(APSA)method was proposed for the nondestructive integration of graphene oxide(GO)sheets with submicron Al2O3 particles.A homogeneous precursor is obtained by uniform deposition of Al3+ions adsorbed on GO surface,followed by low-temperature rapid densification via spark plasma sintering(SPS).For the resultant composites,the incorporated graphene is aligned parallel to the alumina grains,facilitating grain refinement and significantly enhancing the mechanical properties through synergistic effect of various toughening mechanisms,including pull-out,crack extension and bridging.In comparison to monolithic alumina ceramics,the ceramic composites exhibit a 43%enhancement in flexural strength((428±87)MPa)and a 34%improvement in fracture toughness((4.40±0.13)MPa·m1/2).Furthermore,the strength and toughness values also increase by 15%respectively,compared to specimens made from the conventional ball-milling mixing process,confirming the efficacy and advancement of such a manufacturing approach. 展开更多
关键词 graphene alumina ceramic composite reinforcement self-assembly
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Structural and optical properties of Dy3+:YAlO3 phosphors for yellow light-emitting diode applications 认领 引用 被引量：4
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作者 Yingshu Lian Yan Wang +5 位作者 Jianfu Li Zhaojie Zhu Zhenyu You Chaoyang Tu Yadong Xu Wanqi Jie 《Journal of Rare Earths》 SCIE EI CAS CSCD 2021年第8期889-896,共8页
The spectroscopic properties of a series of Dy3+single-doped and Dy3+/Nd3+,Dy3+/Tb3+,and Dy3+/Tm3+co-doped YAlO3(yttrium aluminum perovskite,YAP)phosphors were investigated and compared through... The spectroscopic properties of a series of Dy3+single-doped and Dy3+/Nd3+,Dy3+/Tb3+,and Dy3+/Tm3+co-doped YAlO3(yttrium aluminum perovskite,YAP)phosphors were investigated and compared through the measurements of optical absorption,emission spectra,and fluorescence decay curves.For the Dy3+ion single-doped samples,the intensity of each absorption band increases with an increment in Dy3+ion doping concentration,and the identified strong absorption peak at 447 nm indicates that Dy3+:YAP phosphors are suitable to be pumped by a blue laser diode(LD).For all co-doped samples,absorption peaks of Dy3+ion along with some of the absorption bands of Nd3+,Tb3+,and Tm3+ions are observed.Under 351 and 447 nm excitation,a prominent emission peak at 572 nm was obtained in all the samples,corresponding to Dy3+:4F9/2→6H13/2transition.Here,2 at%Dy3+:YAP phosphor exhibits the highest yellow emission intensity under 447 nm pumping.Among the three kinds of Dy3+co-doped phosphors,Dy3+/Tb3+:YAP phosphor possesses the dominant yellow emission.The fluorescence decay curves show exponential behaviour and are fitted well.The Commission International de L’Eclairage(CIE)chromaticity coordinates were calculated following the respective emission spectra,and it is found that all the coordinates locate in the yellow region.The energy transfer(ET)processes were investigated and the concentration quenching mechanism was discussed.The obtained results suggest that Dy3+-activated YAP phosphors are good candidates for yellow LED applications. 展开更多
关键词 Dy3+:YAP phosphors Optical properties Decay lifetime CIE Energy transfer process Rare earths
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Facile fabrication of ultrafine nickel-iridium alloy nanoparticles/graphene hybrid with enhanced mass activity and stability for overall water splitting 认领 引用 被引量：3
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作者 Shen Zhang Xing Zhang +3 位作者 Xuerong Shi Feng Zhou Ruihu Wang Xiaoju Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第10期166-173,共8页
Developing active and durable electrocatalysts for overall water splitting is desirable but challenging to realize sustainable hydrogen production.Here,we report a facile and general method to prepare ultrafine nickel... Developing active and durable electrocatalysts for overall water splitting is desirable but challenging to realize sustainable hydrogen production.Here,we report a facile and general method to prepare ultrafine nickel(Ni)-iridium(Ir)alloy nanoparticles/graphene hybrids for overall water splitting.The optimized hybrid with 4.9 wt%Ir exhibits much higher catalytic activity and durability than commercial 20 wt%Ir/C for both oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).Theoretical simulations reveal that the incorporation of Ir in metallic Ni lattice regulates hydrogen adsorption free energy to the optimum level,thus improving HER activity,while in situ generated amorphous Ir-Ni hydr(oxy)oxides around metallic Ni-Ir core have been demonstrated to be the active species under OER conditions,which switches OER rate-determining step to energy-favorable pathway.The overall water splitting electrolyzer assembled by the optimized electrocatalyst shows a low cell voltage of only 1.52 V and excellent stability to deliver a current density of 10 m A cm-2.This work provides a powerful strategy toward general synthesis of ultrafine alloy nanoparticles for high-performance overall water splitting. 展开更多
关键词 Alloy nanoparticles Iridium Electrocatalysts Water splitting Mass activity
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Surface Oxidation of Single-walled-carbon-nanotubes with Enhanced Oxygen Electroreduction Activity and Selectivity 认领 引用 被引量：6
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作者 CUI Ya-Qi XU Jiao-Xing +1 位作者 WANG Mei-Lin GUAN Lun-Hui 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2021年第5期533-539,527,共7页
Electrochemical oxygen reduction reaction(ORR)with 2-electron process is an alternative for decentralized H2O2production,but it remains high challenging to develop highly active and selective catalysts for this ... Electrochemical oxygen reduction reaction(ORR)with 2-electron process is an alternative for decentralized H2O2production,but it remains high challenging to develop highly active and selective catalysts for this process.In this work,we present a selective and efficient nonprecious electrocatalyst,prepared through an easily scalable mild oxidation of single-walled carbon nanotubes(SWNTs)with different oxidative acids including sulfur acid,nitride acid and mixed sulfuricitric acids,respectively.The high-degree oxidized SWNTs treated by mixed acids exhibit the highest activity and selectivity of electroreduction of oxygen to synthesize H2O2at low overpotential in alkaline and neutral media.Spectroscopic characterizations suggested that the C–O is vital for catalyzing 2-electron ORR,providing an insightful understanding of defected carbon surface as the active catalytic sites for 2-electron ORR. 展开更多
关键词 electrocatalysts hydrogen peroxide production oxygen reduction reaction
Locating the cocktail and scaling-relation breaking effects of high-entropy alloy catalysts on the electrocatalytic volcano plot 认领 引用 被引量：7
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作者 Junxiang Chen Yaxin Ji 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第11期2889-2897,共9页
High entropy alloys(HEAs)have been the star materials in electrocatalysis research in recent years.One of their key features is the greatly increased multiplicity of active sites compared to conventional catalytic mat... High entropy alloys(HEAs)have been the star materials in electrocatalysis research in recent years.One of their key features is the greatly increased multiplicity of active sites compared to conventional catalytic materials.This increased multiplicity stimulates a cocktail effect and a scaling-relation breaking effect,and results in improved activity.However,the multiplicity of active sites in HEAs also poses new problems for mechanistic studies.One apparent problem is the inapplicability to HEA catalysts of the currently most popular mechanistic study method,which uses the electrocatalytic theoretical framework(ETF)based on the computational hydrogen electrode(CHE).The ETF uses a single adsorption energy to represent the catalyst,i.e.,a catalyst is represented by a'point'in the volcanic relationship.It naturally does not involve the multiplicity of active sites of a catalyst,and hence loses brevity in expressing the cocktail effect and scaling-relation breaking effect in HEA catalysis.This paper attempts to solve this inapplicability.Based on the fact that the adsorption energy distribution of HEAs is close to a normal distribution,the mean and variance of the adsorption energy distribution are introduced as descriptors of the ETF,replacing the original single adsorption energy.A quantitative relationship between the variance and the cocktail and scaling-relation braking effects is established.We believe the method described in this work will make the ETF more effective in mechanistic studies of HEA electrocatalysis. 展开更多
关键词 High-entropy alloy Electrocatalysis Volcano plot Cocktail effect Scaling-relation breaking effect Adsorption energy distribution
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On the Martensitic Transformation Temperatures and Mechanical Properties of NiTi Alloy Manufactured by Selective Laser Melting: Effect of Remelting 认领 引用 被引量：4
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作者 Jian-Bin Zhan Yan-Jin Lu Jin-Xin Lin 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2021年第9期1223-1233,共11页
In this study, the infl uence of laser remelting on the relative density, martensitic transformation temperatures(MTTs), and mechanical properties of a NiTi alloy fabricated by selective laser melting(SLM) at a laser ... In this study, the infl uence of laser remelting on the relative density, martensitic transformation temperatures(MTTs), and mechanical properties of a NiTi alloy fabricated by selective laser melting(SLM) at a laser power between 15 and 75 W were investigated. A relative alloy density of approximately 99% was achieved in the power range of 45–60 W corresponding to the forming energy density range of 65.45–87.27 J/mm3. The MTTs increased with the increase in the energy density;thus, the initial contents of the B2 and B19′ phases of the SLM-produced NiTi alloy can be tailored by the utilized technique. However, the number of defects such as metallurgical pores and microcracks considerably increased at higher energy densities(> 87.27 J/mm3). Interestingly, the concentration of these defects was reduced by remelting in the energy density range of 21.82–65.45 J/mm3, while the alloy relative density increased to 99.7% ± 0.1% at a remelting energy density of 65.45 J/mm3. The results of tensile testing revealed that when the remelting energy was 75% or 100% of the forming energy input, the ultimate tensile strength and elongation of the alloy significantly increased. Therefore, the remelting strategy represents a promising route for manufacturing NiTi alloys with desired MTT ranges and mechanical properties. 展开更多
关键词 Selective laser melting NiTi alloy Laser remelting Martensitic transformation temperature
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Synthesis and application of rhodamine-based fluorescent probe dyes with spacer linker arm 认领 引用 被引量：4
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作者 Yong Gao Jian Li Li Zhen Shi 《Chinese Chemical Letters》 SCIE CAS 2007年第6期667-669,共3页
When rhodamine-based fluorescent probe dyes are used to track target molecules they always perturb the behavior of target molecules because of steric hindrance effect. In order to minimize potential steric problems, a... When rhodamine-based fluorescent probe dyes are used to track target molecules they always perturb the behavior of target molecules because of steric hindrance effect. In order to minimize potential steric problems, a kind of rhodamine-based fluorescent probe dye with spacer linker arm was designed and synthesized and its application in immunofluorescence histochemistry was investigated. 展开更多
关键词 Rhodamine Fluorescent probe dye Spacer linker arm Synthesis Immunofluorescence histochemistry
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Separation and recovery of rare earth from waste nickel-metal hydride batteries by phosphate based extraction-precipitation 认领 引用 被引量：3
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作者 Hailan Zhi Shuainan Ni +3 位作者 Xiang Su Wenqi Xie Hepeng Zhang Xiaoqi Sun 《Journal of Rare Earths》 SCIE EI CAS CSCD 2022年第6期974-980,I0005,共7页
A novel type of extraction-precipitation strategy based on phosphate was developed to recover rare earth(RE,i.e.,La,Ce,Nd,and Pr)from waste nickel-metal hydride(NiMH)batteries.This method does not require saponificati... A novel type of extraction-precipitation strategy based on phosphate was developed to recover rare earth(RE,i.e.,La,Ce,Nd,and Pr)from waste nickel-metal hydride(NiMH)batteries.This method does not require saponification and organic solvents.The novel phosphates,i.e.,dibenzyl phosphate(DBP),diphenyl phosphate(DPP),triphenyl phosphate(TPP)were studied as extraction-precipitants.DBP has high precipitation efficiencies for RE3+,which can reach 97.84%,100%,100%and 99.77%,respectively.In addition,the precipitation efficiencies of Mn2+,Co2+and Ni2+are less than 1.75%.DBP-RE has the largest particle size(D10=52.6μm,D50=135.35μm,D90=296.08μm),which is much larger than the precipitations formed by NH4HCO3,H2C2O4,CaO and MgO.The larger precipitation particle sizes contribute to improving the solid-liquid separation efficiency.With 3 mol/L hydrochloric acid,the stripping efficiency of DBP-RE reaches 98.60%,and the purity of recovered RE is 99.85%.The regenerated DBP can be directly used for the recycling extraction.Therefore,the novel extraction-precipitation strategy is a green and sustainable separation method. 展开更多
关键词 Waste nickel-metal hydride battery Rare earth Extraction-precipitation Phosphonic acid(ester)
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