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Carboxylated Carbon Nanotube-Supported Copper-Indium Bimetallic Catalysts for Electroreduction of CO2 to Dimethyl Carbonate via Membrane-Free Cascade Electrosynthesis 认领 引用
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作者 Youjia Wang Xin Ma +4 位作者 Yuxin Tian Wenchao Wang Bochen Tian Yansheng Liu Junwei Hou 《Carbon and Hydrogen》 SCIE CAS CSCD 2026年第2期226-243,共18页
Under the background of the dual carbon strategy,upgrading CO2 electroreduction from C1 products to high-value C3 esters is an important direction for realizing its resource utilization and valorization.In this wor... Under the background of the dual carbon strategy,upgrading CO2 electroreduction from C1 products to high-value C3 esters is an important direction for realizing its resource utilization and valorization.In this work,Cu100In50 bimetallic catalysts supported on carboxylated carbon nanotubes were prepared,and a membrane-free paired electrolytic cell cascade system was constructed to achieve the directional conversion of CO2→CO→dimethyl carbonate(DMC).The catalyst exhibits enhanced CO supply and interfacial mass transfer capability,with the number of CO adsorption sites increased by 1.8 times and the methanol contact angle reduced from 22°to 8°.Electrochemical measurements show that the catalyst achieves a CO Faraday efficiency(FECO)of 60.9%at−1.8 V versus Ag/AgCl,whereas the FEH2 remains as low as 2.1%.In the cascade reaction,the FEDMC reaches 52.3%at−2.2 V and remains at 49.6%after 5 cycles.The system can also be extended to the electrosynthesis of diethyl carbonate(DEC),giving a FEDEC of 27.8%.In situ Raman spectroscopy combined with DFT calculations reveals that In doping shifts the d-band center of Cu by 0.38 eV,regulates the adsorption behavior of key intermediates,and suppresses HER,whereas carboxyl groups optimize the interfacial electronic structure and mass transfer behavior.This work provides an efficient catalytic strategy and mechanistic insight for the cascade valorization of CO2 into high-value carbonates. 展开更多
关键词 carboxylated carbon nanotubes cascade reaction CO2electroreduction copper-indium bimetallic catalyst DFT dimethyl carbonate insitu Raman spectroscopy
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Size effect of carbon nanotubes confined CoP-Ni2P heterostructure via phosphorylation-induction strategy for efficient overall water splitting 认领 引用 被引量：1
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作者 Neng Chen Sai Che +3 位作者 Ye-Heng Zhang Hong-Qiang Li Yong-Feng Li Xiao-Jun He 《Rare Metals》 SCIE EI CAS CSCD 2025年第7期4740-4755,共16页
The size tuning of one-dimensional(1D)spatially confined electrocatalysts with abundant exposed active sites is still a huge challenge for electrocatalytic hydrogen/oxygen evolution reactions(HER/OER)and overall water... The size tuning of one-dimensional(1D)spatially confined electrocatalysts with abundant exposed active sites is still a huge challenge for electrocatalytic hydrogen/oxygen evolution reactions(HER/OER)and overall water splitting(OWS).Herein,we construct CoPNi2P heterostructure embedded ultrafine N-doped carbon nanotubes(CoP-Ni2P@U-NCNTs/NF)with a diameter size of about 50 nm from 2D cobalt-based zeolitic imidazolate framework(Co-ZIF-L/NF)via phosphorylation strategy,while Co-Ni embedded N-doped carbon nanotubes with a diameter of about 200 nm are constructed via carbonization.The size-tuned CoP-Ni2P@U-NCNTs/NF possesses abundant active sites and electron transport pathways,and the stability of CoP-Ni2P heterostructure is improved by carbon coating.Density functional theory(DFT)calculation results verify that the Ni2P and CoP heterojunction synergistic ally promotes the electron redistribution of the Co-Ni to optimize Gibbs free energy of H*(ΔGH*).Meanwhile,the NCNTs-confined CoP-Ni2P induced by phosphating accelerates the reconstruction of the CoOOH-NiOOH compared with Ni-Co,therebyboosting the reaction kinetics of efficient OWS due to the reduced reaction energy barrier of O-O coupling.As expected,the CoP-Ni2P@U-NCNTs/NF favors a low overpotential of 67/203 mV@10 mA cm-2for the HER/OER,realizing an ultralow cell voltage of 1.52V@10 mA cm-2for OWS and long-term durability at various current densities.This work provides a feasible approach to tuning the composition and structure of highefficiency electrocatalysts for the production of green hydrogen. 展开更多
关键词 In-situ growth Transition metal phosphide CoP-Ni2P heterostructure Ultrafine N-doped carbon nanotubes Water splitting
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A novel stack-HfO2top-gate structure for improving performance of network carbon nanotube transistor 认领 引用
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作者 Bowen Zhang Yimin Lei +8 位作者 Jiejie Zhu Weiwei Wang Yuxiang Wei Lingjie Qin Mingchen Zhang Jiaxiang Xu Hong Wang Xiaohua Ma Yue Hao 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期511-516,共6页
Carbon nanotubes(CNTs)are regarded as a powerful contender to replace Si transistors after Moore's law due to their advantages such as quasi-ballistic transport,high carrier mobility,and low power consumption.In t... Carbon nanotubes(CNTs)are regarded as a powerful contender to replace Si transistors after Moore's law due to their advantages such as quasi-ballistic transport,high carrier mobility,and low power consumption.In the traditional CNT preparation process,CNTs are deposited on SiO2substrate and then the gate dielectric is deposited.In this structure,pinholes will appear between CNTs and dielectric layer,which will affect the gate-control and increase the gate leakage current.Therefore,in this paper,we designed a new stack-HfO2top-gate(STG)network CNTFET.By filling the pinholes between CNTs and dielectric layer,the contact interface condition is improved,reducing the subthreshold swing and improving Ion/Ioffof the device.Meanwhile,through first-principles calculations,compared with the conventional structure,the interface charge transfer value of the CNT/HfO2interface for STG is about 5 times smaller than that of CNT/SiO2interface.Specifically,the mobility and SS,and Ion/Ioffof the STG structure are 130 cm2/V·s,156 mV/dec,and 107,respectively.Taking into account the above advantages,the proposed STG structure has reference value for improving the performance of CNTFET. 展开更多
关键词 carbon nanotube HfO2 gate dielectric interface
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In-situ Z-scheme hetero-phase homojunction significantly enhances the carrier separation efficiency of TiO2 nanotube arrays:Key role of crystal phase engineering 认领 引用
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作者 Bicheng Ji Xicheng Li +6 位作者 Shuai Gao Pengyuan Liu Jiajie Bao Lv Qian Changzheng Wang Qiang Wang Chong-Chen Wang 《Chinese Chemical Letters》 SCIE CAS CSCD 2026年第2期721-727,共7页
Light-energy-driven semiconductor catalysis offers attractive ways to address environmental and energy crises.TiO2 is the most promising catalyst for photocatalysis,but the lack of charge-carrier separation efficie... Light-energy-driven semiconductor catalysis offers attractive ways to address environmental and energy crises.TiO2 is the most promising catalyst for photocatalysis,but the lack of charge-carrier separation efficiency severely limits its catalytic performance.In this study,we carried out crystal phase engineering to prepare in situ Z-scheme hetero-phase homojunction of anatase-rutile and clarified the structure-performance relationship.The efficiency of sulfamerazine removal by hetero-phase homojunction TiO2 nanotube arrays in a single-compartment photocatalytic fuel cell system was improved by 1.93 times compared to conventional anatase TiO2 nanotube arrays and the degradation pathways were revealed by the Fukui function combined with HP-LCMS.The successful construction of Z-scheme hetero-phase homojunction was confirmed by Raman,X-ray diffraction(XRD),and electron spin resonance(ESR),which combined with density functional theory(DFT)calculations revealed the key role of crystal phase engineering in the construction of hetero-phase homojunction.This work provides a novel strategy for the scientific design of titanium dioxide photocatalysts. 展开更多
关键词 Crystal phase engineering Z-scheme hetero-phase homojunction TiO2nanotube arrays Photocatalytic fuel cells Emerging pollutants
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Direct Greenhouse Gases Conversion to Few-Walled Carbon Nanotubes:Optimization of Dual-Step Process Overcoming Single-Step Limitations 认领 引用
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作者 Jaewon Jang Eunchae Oh +3 位作者 Byung-Joo Kim Young-Hoon Kim Junghoon Yang Jungpil Kim 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第1期223-237,共15页
This study investigated the efficient conversion of greenhouse gases(GHGs),CO2and CH4mixtures,into few-walled carbon nanotubes(FWCNTs)through an optimized single-step and dual-step chemical vapor deposition(CVD)... This study investigated the efficient conversion of greenhouse gases(GHGs),CO2and CH4mixtures,into few-walled carbon nanotubes(FWCNTs)through an optimized single-step and dual-step chemical vapor deposition(CVD)process.In the single-step process for directly synthesizing FWCNTs from greenhouse gases,CO2concentration,gas flowrates,and H2addition were identified as factors influencing the growth of FWCNTs.It was demonstrated that minimizing the amounts of CO2and H2was essential for achieving complete CO2conversion because CO2acts as an oxidizing agent that hinders CNT growth,while an excess of H2disrupts the chemical equilibrium of the CO2conversion reaction,leading to side reactions that suppress FWCNTs formation.To overcome these limitations,a dual-step approach incorporating sequential catalytic reactions was developed.In the first step,the Ni/SiO2catalyst was utilized to facilitate CO2methanation,reducing CO2amounts while generating CH4-rich gas.In the second step,CH4pyrolysis was performed over the FeMo/MgO catalyst,enabling the growth of high-quality FWCNTs.This sequential configuration successfully synthesized FWCNTs under conditions previously unattainable in the single-step process,validating the effectiveness of the dual-step design.The strategic optimization of process parameters and sequential catalytic reactions established a viable route for converting GHGs into valuable FWCNTs. 展开更多
关键词 carbon dioxide CH4pyrolysis CO2methanation few-walled carbon nanotubes greenhouse gases
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Engineering Cl vacancies in lead-free halide double perovskites decorated on TiO2nanotubes for highly sensitive NO2sensing at room temperature 认领 引用 被引量：1
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作者 Keke Li Haiquan Wang +3 位作者 Zhen-Kun He Yan-Yan Song Zhida Gao Chenxi Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第8期618-623,共6页
The sensitive and selective monitoring of nitrogen dioxide(NO2)can have a significant impact on environmental monitoring and health protection.Unfortunately,commercial NO2sensors largely suffer from poor detecti... The sensitive and selective monitoring of nitrogen dioxide(NO2)can have a significant impact on environmental monitoring and health protection.Unfortunately,commercial NO2sensors largely suffer from poor detection sensitivity and high operating temperatures.In this study,we developed a sensitive roomtemperature NO2sensor based on an n-n heterojunction comprised of a Cs2AgInCl6perovskite with chlorine vacancies(VCl)and TiO2nanotube arrays(VCl-Cs2AgInCl6/TiO2NTs).In this design,the large number of chlorine vacancies in the Cs2AgInCl6perovskite act as active sites for oxygen adsorption and the subsequent sensing reaction.Benefitting from the formation of the n-n type heterojunction and the onedimensional structure of the TiO2nanotubes,the Fermi levels are aligned,thereby facilitating the efficient transport of charge carriers between the target gas and the sensing interface.The resulting VClCs2Ag In Cl6/TiO2NTs demonstrate a high response of 7.26 toward 1 ppm of NO2at room temperature,possess a detection limit as low as 20 ppb,and have outstanding performance stability.This work widens the application of perovskite materials and indicates their potential application in medical diagnostics,environmental monitoring,and smart sensing systems. 展开更多
关键词 TiO2nanotube arrays n-n Type heterojunction Roomtemperature Cl vacancy NO2detection
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Corrosion resistance of self-healing three-dimensional Ti/Al-doped TiO2nanotubes Ti3AlC2coating deposited by magnetron sputtered on copper 认领 引用
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作者 WANG Guo-qing WANG Ning +5 位作者 HU Yi-teng WANG Jing GAO Chuan-hui WANG Jie XUE Jun-jie YAN Ke-xin 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第3期867-881,共15页
Copper is a versatile material,commonly utilized in power transmission and electronic devices,but its relative high reactivity necessitates a long-lasting protective technique.Here,we report a method that combines pla... Copper is a versatile material,commonly utilized in power transmission and electronic devices,but its relative high reactivity necessitates a long-lasting protective technique.Here,we report a method that combines plasma-enhanced non-equilibrium magnetron sputtering physical vapor deposition(PEUMS-PVD)and anodization to construct a self-healing three-dimensional Ti/Al-doped TiO2nanotubes/Ti3AlC2coating on the surface of Cu substrates.This novel strategy enhances the corrosion resistance of copper substrates in marine environments,with corrosion current densities of up to 4.5643×10−8A/cm2.Among them,the doping of nano-aluminum particles makes the coating self-healing.The mechanistic analysis of the corrosion behaviors during early immersion experiments was conducted using electrochemical noise,and revealed that during the initial stages of coating immersion,uniform corrosion predominates,with a minor occurrence of localized corrosion. 展开更多
关键词 magnetron sputtering TiO2nanotubes Ti3AlC2coating corrosion resistance performance
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Enhancing Alkaline Hydrogen Evolution Reaction on Ru- Decorated TiO2 Nanotube Layers: Synergistic Role of Ti3+, Ru Single Atoms, and Ru Nanoparticles 认领 引用 被引量：2
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作者 Sitaramanjaneya Mouli Thalluri Jhonatan Rodriguez-Pereira +7 位作者 Jan Michalicka Eva Kolíbalová Ludek Hromadko Stanislav Slang Miloslav Pouzar Hanna Sopha Raul Zazpe Jan M.Macak 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2025年第3期191-198,共8页
Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolu... Synergistic interplays involving multiple active centers originating from TiO2 nanotube layers(TNT)and ruthenium(Ru)species comprising of both single atoms(SAs)and nanoparticles(NPs)augment the alkaline hydrogen evolution reaction(HER)by enhancing Volmer kinetics from rapid water dissociation and improving Tafel kinetics from efficient H*desorption.Atomic layer deposition of Ru with 50 process cycles results in a mixture of Ru SAs and 2.8-0.4 nm NPs present on TNT layers,and it emerges with the highest HER activity among all the electrodes synthesized.A detailed study of the Ti and Ru species using different high-resolution techniques confirmed the presence of Ti3+states and the coexistence of Ru SAs and NPs.With insights from literature,the role of Ti3+,appropriate work functions of TNT layers and Ru,and the synergistic effect of Ru SAs and Ru NPs in improving the performance of alkaline HER were elaborated and justified.The aforementioned characteristics led to a remarkable performance by having 9mV onset potentials and 33 mV dec-1 of Tafel slopes and a higher turnover frequency of 1.72 H2 s-1 at 30 mV.Besides,a notable stability from 28 h staircase chronopotentiometric measurements for TNT@Ru surpasses TNT@Pt in comparison. 展开更多
关键词 alkaline hydrogen evolution reaction ruthenium nanoparticles ruthenium single atoms TiO2 nanotube layers water dissociation
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Three-dimensional Porous Networks of Ultra-long Electrospun SnO_2 Nanotubes with High Photocatalytic Performance 认领 引用 被引量：12
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作者 Peng Zhang Lijie Wang +2 位作者 Xi Zhang Junhua Hu Guosheng Shao 《Nano-Micro Letters》 SCIE EI CAS 2015年第1期86-95,共10页
Recent progress in nanoscience and nanotechnology creates new opportunities in the design of novel SnO2 nanomaterials for photocatalysis and photoelectrochemical. Herein, we firstly highlight a facile method to prepar... Recent progress in nanoscience and nanotechnology creates new opportunities in the design of novel SnO2 nanomaterials for photocatalysis and photoelectrochemical. Herein, we firstly highlight a facile method to prepare threedimensional porous networks of ultra-long SnO2 nanotubes through the single capillary electrospinning technique.Compared with the traditional SnO2 nanofibers, the as-obtained three-dimensional porous networks show enhancement of photocurrent and photocatalytic activity, which could be ascribed to its improved light-harvesting efficiency and high separation efficiency of photogenerated electron–hole pairs. Besides, the synthesis route delivered three-dimensional sheets on the basis of interwoven nanofibrous networks, which can be readily recycled for the desirable circular application of a potent photocatalyst system. 展开更多
关键词 Electrospinning SnO2 nanotube Photocurrent Photocatalytic Recyclability
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Fabrication and photodegradation properties of TiO_2 nanotubes on porous Ti by anodization 认领 引用 被引量：10
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作者 曹国剑 崔博 +3 位作者 王文奇 唐光泽 冯义成 王丽萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2581-2587,共7页
Both Ti foil and porous Ti were anodized in 0.5%HF and in ethylene glycol electrolyte containing 0.5%NH4F(mass fraction) separately. The results show that TiO2 nanotubes can be formed on Ti foil by both processes, whe... Both Ti foil and porous Ti were anodized in 0.5%HF and in ethylene glycol electrolyte containing 0.5%NH4F(mass fraction) separately. The results show that TiO2 nanotubes can be formed on Ti foil by both processes, whereas TiO2 nanotubes can be formed on porous Ti only in the second process. The overhigh current density led to the failure of the formation nanotubes on porous Ti in 0.5%HF electrolyte. TiO2 nanotubes were characterized by SEM and XRD. TiO2 nanotubes on porous Ti were thinner than those on Ti foil. Anatase was formed when TiO2 nanotubes were annealed at 400 °C and fully turned into rutile at 700 °C. To obtain good photodegradation, the optimal heat treatment temperature of TiO2 nanotubes was 450 °C. The porosity of the substrates influenced photodegradation properties. TiO2 nanotubes on porous Ti with 60% porosity had the best photodegradation. 展开更多
关键词 TiO_2 nanotubes anodization photodegradation porous Ti
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The gas sensing properties of TiO2nanotubes synthesized by hydrothermal method 认领 引用 被引量：11
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作者 Yan Li Wang Shun Tan +4 位作者 Jia Wang Zhi Jin Tan Qiu Xia Wu Zheng Jiao Ming Hong Wu 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第5期603-606,共4页
In this paper,the TiO2nanotubes were synthesized by hydrothermal method using a 10 mol/L NaOH aqueous solution at 150℃.The structure of prepared materials was characterized by X-ray diffraction(XRD),transmission e... In this paper,the TiO2nanotubes were synthesized by hydrothermal method using a 10 mol/L NaOH aqueous solution at 150℃.The structure of prepared materials was characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM).scanning electron microscope(SEM)and Brunauer-Emmett-Teller(BET).The prepared TiO2nanotubes were used to prepare thick film gas sensors and the gas sensing properties to various gases were tested.Results show the prepared TiO2nanotube gas sensors responses to ethanol under dry condition at 450℃.This could be attributed to the fact that it had high porous morphology and a higher pore volume,which can promote the diffusion of ethanol deep inside the films and improve the sensor response.Moreover,the gas sensor made with nanotubes exhibit high selective response towards ethanol gas compared with H_2,CO,acetone. 展开更多
关键词 TiO2nanotubes Hydrothermal method Gas sensing
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TiO_2 composite nanotubes embedded with CdS and upconversion nanoparticles for near infrared light driven photocatalysis 认领 引用 被引量：6
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作者 Wanni Wang Fu Zhang +4 位作者 Chuanling Zhang Yang Wang Wei Tao Sheng Cheng Haisheng Qian 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第11期1851-1859,共9页
We report a colloidal process to coat a layer of TiO2onto SiO2composite nanofibers containing embedded CdS and upconversion nanoparticles(UCNPs).The SiO2composite nanofibers were fabricated by electrospinning.To impro... We report a colloidal process to coat a layer of TiO2onto SiO2composite nanofibers containing embedded CdS and upconversion nanoparticles(UCNPs).The SiO2composite nanofibers were fabricated by electrospinning.To improve the energy transfer efficiency,UCNPs and CdS nanoparticles were bound in close proximity to each other within the SiO2matrix.β‐NaYF4:Yb(30%),Tm(0.5%)@NaYF4:Yb(20%),Er(2%)core–shell nanoparticles were used as nanotransducers for near infrared light.These nanoparticles exhibited enhanced upconversion fluorescence compared withβ‐NaYF4:Yb(30%),Tm(0.5%)orβ–NaYF4:Yb(30%),Tm(0.5%)@NaYF4nanoparticles.The morphologies,size and chemical compositions have been extensively investigated using field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM),X‐ray diffraction(XRD)and X‐ray photoelectron spectra(XPS),respectively.The TEM images showed that the TiO2composite nanotubes were embedded with a large amount of UCNPs and CdS nanoparticles.The composite TiO2nanotubes degraded more than90%of rhodamine B(RhB)dye during20min of irradiation by simulated solar light.In particular,more than50%of RhB was decomposed in70min,under irradiation of near infrared light(NIR).This high degradation was attributed to the full spectrum absorption of solar light,and the enhanced transfer efficiency for near infrared light.The as‐prepared nanostructures can harness solar energy,and provide an alternative to overcome energy shortages and environmental protection. 展开更多
关键词 TiO2 nanotubes Upconversion nanoparticles Energy transfer Photocatalysis Nanotransducer
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TEM Study on the Formation Process of TiO_2 Nanotubes 认领 引用 被引量：7
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作者 Jing Wei ZHANG Xin Yong GUO +3 位作者 Zhen Sheng JIN Shun Li ZHANG Jing Fang ZHOU Zhi Jun ZHANG 《Chinese Chemical Letters》 SCIE CAS 2003年第4期419-422,共4页
The process, that the polycrystalline TiO2 powders were converted into TiO2 nanotubes, was observed with transmission electron microscope. The results obtained indicated that in concentrated NaOH aqueous solution, ani... The process, that the polycrystalline TiO2 powders were converted into TiO2 nanotubes, was observed with transmission electron microscope. The results obtained indicated that in concentrated NaOH aqueous solution, anisotropic swelling appears on the polycrystalline TiO2 granula at first, and then the nanotubes are formed. 展开更多
关键词 TiO2 nanotubes anisotropic swelling TEM.
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BiVO4/TiO2(N2) Nanotubes Heterojunction Photoanode for Highly Efficient Photoelectrocatalytic Applications 认领 引用 被引量：8
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作者 Rui Wang Jing Bai +3 位作者 Yunpo Li Qingyi Zeng Jinhua Li Baoxue Zhou 《Nano-Micro Letters》 SCIE EI CAS 2017年第2期14-22,共9页
We report the development of a novel visible response BiVO_4/TiO_2(N_2) nanotubes photoanode for photoelectrocatalytic applications. The nitrogen-treated TiO_2 nanotube shows a high carrier concentration rate, thus re... We report the development of a novel visible response BiVO_4/TiO_2(N_2) nanotubes photoanode for photoelectrocatalytic applications. The nitrogen-treated TiO_2 nanotube shows a high carrier concentration rate, thus resulting in a high efficient charge transportation and low electron–hole recombination in the TiO_2–BiVO_4. Therefore, the BiVO_4/TiO_2(N_2) NTs photoanode enabled with a significantly enhanced photocurrent of 2.73 mA cm-2(at 1 V vs. Ag/Ag Cl) and a degradation efficiency in the oxidation of dyes under visible light. Field emission scanning electron microscopy, X-ray diffractometry, energy-dispersive X-ray spectrometer, and UV–Vis absorption spectrum were conducted to characterize the photoanode and demonstrated the presence of both metal oxides as a junction composite. 展开更多
关键词 BiVO4 TiO2(N2) nanotube Heterojunction Photoelectrocatalytic Degradation of dyes
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Reactive MnO2 template-assisted synthesis of double-shelled PPy hollow nanotubes to boost microwave absorption 认领 引用 被引量：9
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作者 Huiling Gu Ji Huang +5 位作者 Na Li Hua Yang Gang Chen Chengjun Dong Chunhong Gong Hongtao Guan 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第15期145-153,共9页
Microwave absorbing materials(MAMs)with wide effective absorption bandwidth(EAB)and low filling ratio are highly desirable for practical applications.Rational design in components and structures is one of the effectiv... Microwave absorbing materials(MAMs)with wide effective absorption bandwidth(EAB)and low filling ratio are highly desirable for practical applications.Rational design in components and structures is one of the effective strategies to achieve MAMs with high performance.Herein,double-shelled hollow(DSH)polypyrrole(PPy)nanotubes were synthesized with hydrochloric acid(HCl)and sodium pstyrene sulfonate(SS)co-doping polymerization process using manganese dioxide(MnO2)nanorods as a self-sacrifice template.With the increase of HCl concentration,the 1D MnO2 core diminishes gradually to form the MnO2@PPy coaxial nanostructures and finally the DSH PPy nanotube,which tunes the microwave absorption performance.Importantly,the DSH PPy nanotubes exhibit excellent microwave absorption of an optimal reflection loss of–50.4 dB and a wide EAB of 7.7 GHz with a low filling ratio of 5 wt%in a paraffin wax matrix.The excellent microwave absorption is believed to be mainly attributed to the enhanced synergistic effects of interfacial polarization and conduction loss arising from the unique DSH structure and the co-doping polymerization. 展开更多
关键词 PPy nanotube MnO2template Double-shelled hollow structure Microwave absorption
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Preparation of Polyaniline/TiO_2 Composite Nanotubes for Photodegradation of AZO Dyes 认领 引用 被引量：4
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作者 程杨 AN Liang +1 位作者 ZHAO Zongshan WANG Guanghui 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第3期468-472,共5页
Polyaniline （PANI） composite nanotubes （90-130 nm in diameter） containing titanium dioxide （TiO2） nanoparticles （about 10 nm in diameter） were synthesized through a self-assembly process in the presence of a-n... Polyaniline （PANI） composite nanotubes （90-130 nm in diameter） containing titanium dioxide （TiO2） nanoparticles （about 10 nm in diameter） were synthesized through a self-assembly process in the presence of a-naphthalenesulfonic acid （a-NSA） as the dopant. It was found that PANI-TiO2 composites and PANI nanotubes both behaved with significant photocatalytic activities towards AZO dyes, during 2 h photocatalytic processes under natural light, the degradation ratio was 94.2% and 97.2% respectively （methyl orange and orange II）. The morphology of such products was characterized by SEM. The specific surface area of such composite nanotubes was 14.7 m2/g compared to normal polyaniline which was 0.27 m2/g. IR and X-ray diffraction characterizations showed that the chemical chain of the composite nanotubes was identical to that of the doped PANI. It may provide a new way for photodegradation of organic contaminants by using conjugated polymer with dimensional structure. 展开更多
关键词 polyaniline TiO2 nanotube photocatalysis
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Review of Water-Assisted Crystallization for TiO_2 Nanotubes 认领 引用 被引量：4
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作者 Xiaoyi Wang Dainan Zhang +2 位作者 Quanjun Xiang Zhiyong Zhong Yulong Liao 《Nano-Micro Letters》 SCIE EI CAS 2018年第4期366-393,共28页
TiO_2 nanotubes(TNTs) have drawn tremendous attention owing to their unique architectural and physical properties. Anodizing of titanium foil has proven to be the most efficient method to fabricate well-aligned TNTs,w... TiO_2 nanotubes(TNTs) have drawn tremendous attention owing to their unique architectural and physical properties. Anodizing of titanium foil has proven to be the most efficient method to fabricate well-aligned TNTs,which, however, usually produces amorphous TNTs and needs further thermal annealing. Recently, a water-assisted crystallization strategy has been proposed and investigated by both science and engineering communities. This method is very efficient and energy saving, and it circumvents the drawbacks of thermal sintering approach. In this paper, we review the recent research progress in this kind of lowtemperature crystallization approach. Here, various synthetic methods are summarized, and the mechanisms of the amorphous–crystalline transformation are analyzed. The fundamental properties and applications of the low-temperature products are also discussed. Furthermore, it is proved that the water-assisted crystallization approach is not only applicable to TNTs but also to crystallizing other metal oxides. 展开更多
关键词 TiO2nanotube Crystallization Waterassisted Low-temperature
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Supporting IrO2 and IrRuOx nanoparticles on TiO2 and Nb-doped TiO2 nanotubes as electrocatalysts for the oxygen evolution reaction 认领 引用 被引量：3
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作者 Radostina V.Genova-Koleva Francisco Alcaide +4 位作者 Garbine Alvarez Pere L.Cabot Hans-Jürgen Grande María V.Martínez-Huerta Oscar Miguel 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第7期227-239,共13页
IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and character... IrO2 and IrRuOx(Ir:Ru 60:40 at%),supported by 50 wt%onto titania nanotubes(TNTs)and(3 at%Nb)Nb-doped titania nanotubes(Nb-TNTs),as electrocatalysts for the oxygen evolution reaction(OER),were synthesized and characterized by means of structural,surface analytical and electrochemical techniques.Nb doping of titania significantly increased the surface area of the support from 145(TNTs)to 260 m2g-1(Nb-TNTs),which was significantly higher than those of the Nb-doped titania supports previously reported in the literature.The surface analytical techniques showed good dispersion of the catalysts onto the supports.The X-ray photoelectron spectroscopy analyses showed that Nb was mainly in the form of Nb(IV)species,the suitable form to behave as a donor introducing free electrons to the conduction band of titania.The redox transitions of the cyclic voltammograms,in agreement with the XPS results,were found to be reversible.Despite the supported materials presented bigger crystallite sizes than the unsupported ones,the total number of active sites of the former was also higher due to their better catalyst dispersion.Considering the outer and the total charges of the cyclic voltammograms in the range 0.1–1.4 V,stability and electrode potentials at given current densities,the preferred catalyst was Ir O2 supported on the Nb-TNTs.The electrode potentials corresponding to given current densities were between the smallest ones given in the literature despite the small oxide loading used in this work and its Nb doping,thus making the Nb-TNTs-supported IrO2 catalyst a promising candidate for the OER.The good dispersion of IrO2,high specific surface area of the Nb-doped supports,accessibility of the electroactive centers,increased stability due to Nb doping and electron donor properties of the Nb(IV)oxide species were considered the main reasons for its good performance. 展开更多
关键词 Nb-doped TiO2 nanotubes IrO2 catalyst IrRuOx catalyst Oxygen evolution reaction PEMWE
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Binary molten salt in situ synthesis of sandwich-structure hybrids of hollowβ-Mo2C nanotubes and N-doped carbon nanosheets for hydrogen evolution reaction 认领 引用 被引量：8
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作者 Tianyu Gong Yang Liu +6 位作者 Kai Cui Jiali Xu Linrui Hou Haowen Xu Ruochen Liu Jianlin Deng Changzhou Yuan 《Carbon Energy》 SCIE EI CAS CSCD 2023年第12期111-124,共14页
Focused exploration of earth-abundant and cost-efficient non-noble metal electrocatalysts with superior hydrogen evolution reaction(HER)performance is very important for large-scale and efficient electrolysis of water... Focused exploration of earth-abundant and cost-efficient non-noble metal electrocatalysts with superior hydrogen evolution reaction(HER)performance is very important for large-scale and efficient electrolysis of water.Herein,a sandwich composite structure(designed as MS-Mo2C@NCNS)ofβ-Mo2C hollow nanotubes(HNT)and N-doped carbon nanosheets(NCNS)is designed and prepared using a binary NaCl–KCl molten salt(MS)strategy for HER.The temperature-dominant Kirkendall formation mechanism is tentatively proposed for such a three-dimensional hierarchical framework.Due to its attractive structure and componential synergism,MS-Mo2C@NCNS exposes more effective active sites,confers robust structural stability,and shows significant electrocatalytic activity/stability in HER,with a current density of 10 mA cm-2 and an overpotential of only 98 mV in 1 M KOH.Density functional theory calculations point to the synergistic effect of Mo2C HNT and NCNS,leading to enhanced electronic transport and suitable adsorption free energies of H*(ΔGH*)on the surface of electroactive Mo2C.More significantly,the MS-assisted synthetic methodology here provides an enormous perspective for the commercial development of highly active non-noble metal electrocatalysts toward efficient hydrogen evolution. 展开更多
关键词 binary molten-salt synthesis hydrogen evolution reaction Mo2C hollow nanotubes N-doped carbon nanosheets sandwich structure
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Site Selective Spectroscopy of Surfactant-Assembled Y_2O_3∶Eu Nanotubes 认领 引用 被引量：4
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作者 吴长锋 秦伟平 +2 位作者 张继森 秦冠仕 赵丹 《Journal of Rare Earths》 SCIE EI CAS 2003年第6期601-604,共4页
Y_2O_3∶Eu nanotubes were synthesized by a surfactant assembly mechanism. Under ultraviolet-light excitation, the nanotubes present luminescence properties different from that of Y_2O_3∶Eu nanoparticles. The peak pos... Y_2O_3∶Eu nanotubes were synthesized by a surfactant assembly mechanism. Under ultraviolet-light excitation, the nanotubes present luminescence properties different from that of Y_2O_3∶Eu nanoparticles. The peak position of the charge transfer band in excitation spectra varies with the monitoring emission peaks, while the emission spectra are dependent on the excitation wavelength. Laser selective spectroscopy was performed to distinguish the local symmetries of the Eu3+ ions in the nanotubes. The results of laser-selective excitation indicate that the emission centers near the surface of nanotube walls exhibit inhomogeneously broadened spectra without spectral structures while the two sites (site B and site C) inside the nanotube walls present resolved spectral structures. It is concluded by the number and peak positions of the spectral lines that the sites B and C possess different site symmetries. 展开更多
关键词 optics luminescence Y_2O_3∶Eu nanotube rare earths
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