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Fe3+掺杂TiO2的制备及其光催化玉米秸秆发酵产氢的研究 认领 引用
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作者 张靖楠 李甜甜 +4 位作者 李穆奇 周涵钰 杜晨 徐清萍 马戎 《食品与发酵工业》 EI CAS CSCD 北大核心 2026年第8期64-71,共8页
为了提高秸秆类生物质发酵产氢效率,该文采用溶胶-凝胶法制备了复合催化剂Fe3+掺杂二氧化钛(Fe3+/TiO2),利用透射电镜(transmission electron microscope,TEM)、X射线衍射(X-ray diffraction,XRD)、紫外-可见漫反射(ultraviole... 为了提高秸秆类生物质发酵产氢效率,该文采用溶胶-凝胶法制备了复合催化剂Fe3+掺杂二氧化钛(Fe3+/TiO2),利用透射电镜(transmission electron microscope,TEM)、X射线衍射(X-ray diffraction,XRD)、紫外-可见漫反射(ultraviolet-visible diffuse reflectance spectroscopy,UV-vis DRS)和荧光光谱(photoluminescence spectroscopy,PL)对其进行了表征,并对该复合催化剂的光催化玉米秸秆发酵产氢性能进行了研究。结果表明Fe3+掺杂降低了催化剂的颗粒度,拓宽了TiO2的光响应范围,抑制了电子-空穴对的复合。在催化体系pH值为8,辐照时间为2 h,复合催化剂质量浓度为0.3 g/L的情况下,玉米秸秆的最大累积产氢量可达(79.5±1.7)mL/g,较对照组提高了13.9%。高通量测序技术分析结果显示,光催化预处理秸秆后改变了微生物的群落结构,提高了发酵产氢菌的丰度,发酵体系内发酵产氢菌和协同代谢菌间的生长协同作用,有效提高了氢气的产量。利用扫描电镜(scanning electron microscope,SEM)分析、傅里叶红外光谱(Fourier transform infrared spectroscopy,FT-IR)分析、X射线衍射(X-ray diffraction,XRD)分析、热重(derivative thermogravimetry,DTG)分析对秸秆进行表征和测定,结果表明,光催化对秸秆表面形态和结构组分有明显的破坏作用,有利于发酵产氢。 展开更多
关键词 Fe3+掺杂TiO2 光催化 玉米秸秆 发酵产氢
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Insights into mechanisms of activity promotion and SO2tolerance over NbyFezMnCeOxcatalyst with optimized Nb/Fe molar ratio for low-temperature NH3-SCR reaction 认领 引用
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作者 Zhian Gong Lulu Long +3 位作者 Jun Cao Shihong Tian Yadi Yang Xiaojiang Yao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第4期1124-1134,I0005,共11页
SO2-induced MnCeOxcatalyst severe deactivation for low-temperature deNOxremains an intractable issue.In this study,the molar ratio of Nb/Fe was innovatively tuned to enhance the SO2tolerance of Nb and Fe c... SO2-induced MnCeOxcatalyst severe deactivation for low-temperature deNOxremains an intractable issue.In this study,the molar ratio of Nb/Fe was innovatively tuned to enhance the SO2tolerance of Nb and Fe co-doped MnCeOxcatalysts.The Nb7Fe3MnCeOxcatalyst shows optimal catalytic performance advantages,achieving over 90%nitrogen oxide conversion and outstanding N2selectivity within a broad activity temperature range(150-250℃),and also admirable SO2-tolerant performance at 250℃.Detailed experimental results indicate that the strong electron transfer among Fe,Ce and Mn species helps to induce the production of surface oxygen vacancy and accelerate redox cycling,and thus improves the catalytic performance at low temperatures.Moreover,in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)experiments unveil the potential SO2tolerance mechanism of the Nb7Fe3MnCeOxcatalyst.Although the Langmuir-Hinshelwood pathway is somewhat constrained after sample sulfation,the Eley-Rideal pathway greatly facilitates the strongly adsorbed ammonia and NO molecules to undergo the selective catalytic reduction(SCR)reaction.The NO molecules are not required to be weakly adsorbed on the Nb7Fe3MnCeOxcatalyst surface as reactive nitrates,thereby relieving the negative effect of sulfation for NOxremoval. 展开更多
关键词 Environmental catalysis NH3-SCR reaction Ce-based catalysts Nb and Fe co-doping SO2tolerance Rare earths
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Constructing highly efficient Z⁃scheme MIL⁃101(Fe)/Cu2O heterojunction photocatalysts by interface coupling and their mechanism for tetracycline degradation 认领 引用
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作者 WANG Junli JING Miaomiao +4 位作者 LIU Danyang DAI Yurun ZHAO Qiang LI Zuopeng GUO Yong 《无机化学学报》 SCIE CAS CSCD 北大核心 2026年第7期1555-1565,共11页
A series of MIL-101(Fe)/Cu2O heterojunction photocatalysts was successfully constructed by coupling highly active dodecahedral Cu2O with MIL-101(Fe)through a co-precipitation method.The catalytic performance of ... A series of MIL-101(Fe)/Cu2O heterojunction photocatalysts was successfully constructed by coupling highly active dodecahedral Cu2O with MIL-101(Fe)through a co-precipitation method.The catalytic performance of these materials was systematically evaluated under visible light using tetracycline as the target pollutant.The results indicated that when the mass fraction of MIL-101(Fe)was 20%,the composite material exhibited the best catalytic performance,with a tetracycline degradation rate of up to 87.37%after 100 min of illumination,significantly enhancing the photocatalytic degradation efficiency.The significant improvement in photocatalytic performance was mainly attributed to the tight interface coupling between the two components.Transient photocurrent response and electrochemical impedance spectroscopy(EIS)demonstrated that the introduction of MIL-101(Fe)greatly enhanced the electron conduction ability of the composite system and accelerated charge migration.On the other hand,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),UV-Visible diffuse reflectance spectra(UV-Vis DRS),and Mott-Schottky characterizations,combined with electron paramagnetic resonance(EPR)tests,confirmed the formation of an effective Z-scheme heterojunction between the two components.This Z-scheme heterojunction photocatalyst not only promotes the spatial separation of photogenerated electron-hole pairs but also retains the stronger redox ability of the composite material,thereby synergistically achieving efficient degradation of pollutants. 展开更多
关键词 photocatalysis interface coupling MIL-101(Fe)/Cu2O heterojunction Z-type mechanism antibiotic degradation
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Interfacial engineering-mediated S-Scheme heterojunction with dual-ion cycling for enhanced photo-Fenton degradation of levofloxacin using a magnetically recyclable MnFe2O4@MIL-101(Fe)catalyst 认领 引用
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作者 Xichen Mi Tingting Zhan +2 位作者 Xiaojing Zhou Na Ma Wei Dai 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第8期96-108,共13页
The uniform pore size distribution and inherent particle inseparability of iron-based metal-organic frameworks(Fe-MOFs)have been shown to significantly hinder their light-harvesting capabilities and charge carrier sep... The uniform pore size distribution and inherent particle inseparability of iron-based metal-organic frameworks(Fe-MOFs)have been shown to significantly hinder their light-harvesting capabilities and charge carrier separation efficiency.These intrinsic limitations compromise catalyst recyclability and reaction kinetics in practical scenarios,thereby impeding their applicability in the degradation of antibiotic pollutants such as levofloxacin(LEV)in aquatic environments.Here,we report an S-type heterojunction photocatalyst,MnFe2O4@MIL-101(Fe),prepared via hydrothermal coupling of magnetic MnFe2O4 nanoparticles with MIL-101(Fe).The synergistic effect of Fe3+/Fe2+and Mn3+/Mn2+redox pairs,combined with the heterojunction interface and built-in electric field,significantly enhances visible-light-driven photo-Fenton activity.The catalyst degraded over 95%of LEV with a rate constant of 0.05056 min-1 and retained 87%activity after five cycles.LC-MS analysis revealed defluorination and demethylation pathways,while toxicity assessments confirmed lower LC50,mutagenicity,and developmental toxicity of intermediates,validating the environmental viability of the photo-Fenton process. 展开更多
关键词 MnFe 2 O 4 MIL-101(Fe) Levofloxacin Photo-Fenton S-scheme Electric field
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V2O5/TiO2和Cs/Co3O4催化剂联合催化脱除NOx和N2O 认领 引用
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作者 苗静文 樊星 +1 位作者 刘若雯 张雅坤 《环境工程》 CAS CSCD 2026年第2期103-111,共9页
针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础... 针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础上,重点考察了在V2O5/TiO2催化剂之后串接2.0Cs/Co3O4催化剂的联合催化脱除NOx和N2O的性能,并采用N2吸脱附、XRD、XPS和O2-TPD等手段对催化剂理化特性进行表征。结果表明:V2O5/TiO2催化还原NOx时,进气中含2%H2O有利于拓宽活性温度窗口和提高N2选择性,以及抑制N2O形成。在Co3O4表面负载2.0%Cs显著提高了催化剂催化N2O分解性能,这可能与Cs的引入导致部分Co3+还原为Co2+以及催化剂表面形成了更多氧空位有关。高温(400℃)下通入2%H2O对2.0Cs/Co3O4催化N2O分解的抑制作用较弱,但同时通入2%H2O和50×10-6 NO显著抑制了2.0Cs/Co3O4催化剂的活性。采用先V2O5/TiO2后2.0Cs/Co3O4的两段式催化剂联合脱除NOx和N2O时,前端的V2O5/TiO2催化剂主要催化NOx的还原反应,N2O对脱硝过程的影响有限;在V2O5/TiO2催化剂高效脱除NOx(和NH3)的温度范围内,后端的2.0Cs/Co3O4催化剂可较为稳定地催化N2O分解;在温度400℃,进气中含2%H2O时,NOx和NH3转化率均接近100%,N2O转化率为61.3%。 展开更多
关键词 NOx还原 N2O分解 V2O5/TiO2 Cs/Co3O4 联合催化
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High-efficiency Photocatalytic Performance of Bi/Bi2Fe4O9Nanocomposites Synthesized by Hydrothermal Method for Degradation of Bisphenol A 认领 引用
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作者 WANG Junjie LI Yijie +1 位作者 LI Xinyi GUO Dongyun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期364-370,共7页
Bi/Bi2Fe4O9nanocomposites consisting of Bi2Fe4O9nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi2Fe4O9nanosheet surfaces... Bi/Bi2Fe4O9nanocomposites consisting of Bi2Fe4O9nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi2Fe4O9nanosheet surfaces was attributed to the reducibility of 2-methoxyethanol in the precursor solution.Comparative photocatalytic evaluation reveals that the Bi/Bi2Fe4O9nanocomposites significantly enhance the degradation efficiency(99.0%)of bisphenol A compared with Bi2Fe4O9nanosheets(64.2%)under 120 min simulated solar irradiation.This remarkable enhancement can be attributed to the established Bi/Bi2Fe4O9heterojunction structure,which effectively facilitates the separation of photogenerated electron-hole pairs and accelerates interfacial charge transfer between the metallic Bi nanodots and semiconductor Bi2Fe4O9nanosheets.The synergistic effects arising from this unique architecture ultimately lead to superior photocatalytic performance. 展开更多
关键词 Bi2Fe4O9 nanosheets Bi nanodots nanocomposite hydrothermal method photocatalytic performance
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Fe3+掺杂TiO2的制备及可见光催化降解亚甲基蓝 认领 引用
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作者 曾言 张涛 李政 《辽宁化工》 CAS 2026年第2期270-272,共3页
本文以钛酸四丁酯为钛源、Fe(NO3)3·9H2O为铁元素添加剂,制备了Fe3+掺杂TiO2光催化材料,用于可见光降解亚甲基蓝。通过XRD和SEM对光催化材料进行表征分析,进一步考察光催化剂投加量、亚甲基蓝初始质量浓度及初始pH... 本文以钛酸四丁酯为钛源、Fe(NO3)3·9H2O为铁元素添加剂,制备了Fe3+掺杂TiO2光催化材料,用于可见光降解亚甲基蓝。通过XRD和SEM对光催化材料进行表征分析,进一步考察光催化剂投加量、亚甲基蓝初始质量浓度及初始pH对光催化效果的影响。结果表明:Fe3+掺杂TiO2光催化材料由锐钛矿型TiO2粒子和金红石型TiO2粒子组成,为表面光滑的片状结构,粒径大多在50μm左右。当Fe3+掺杂TiO2光催化材料投加量为0.15 g、亚甲基蓝初始质量浓度为10 mg·L-1、初始pH为8时,亚甲基蓝的降解率达到98.02%。 展开更多
关键词 Fe3+掺杂TiO2 光催化 亚甲基蓝
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Fe-Co/Al(2)O3多孔介质催化剂催化低浓度瓦斯燃烧特性 认领 引用
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作者 韩家章 曹运齐 +4 位作者 肜浩楠 翟成 李点尚 童校长 刘方 《煤炭科学技术》 EI CAS CSCD 北大核心 2026年第6期183-195,共13页
针对8%以下煤矿低浓度瓦斯利用率低与大量排空造成能源浪费和温室效应问题,采用超声辅助浸渍法制备了负载Fe2O3与Co3O4双活性组分的Fe-Co/Al(2)O3双金属多孔介质催化剂,在渐变孔密度燃烧器中开展低浓度甲烷催化燃烧性能研究,... 针对8%以下煤矿低浓度瓦斯利用率低与大量排空造成能源浪费和温室效应问题,采用超声辅助浸渍法制备了负载Fe2O3与Co3O4双活性组分的Fe-Co/Al(2)O3双金属多孔介质催化剂,在渐变孔密度燃烧器中开展低浓度甲烷催化燃烧性能研究,重点考察了过量空气系数φa和流量f对燃烧特性的影响,并测试了长期燃烧稳定性。结果表明:Fe-Co/Al(2)O3中的Fe、Co双金属协同参与了CH4催化反应,Fe3+和Co3+在反应中被部分还原为Fe2+和Co2+物种,CoFe2O4尖晶石结构的形成提高了催化剂的热稳定性和抗烧结能力,使其在高温贫燃过程中保持良好的催化活性。CH4氧化反应遵循MvK机制,晶格氧参与CH4中C—H键断裂与活化,其消耗形成氧空位;吸附氧动态补充晶格氧,在维持氧物种迁移与循环的同时进一步促进中间产物氧化。过量空气系数和流量显著影响温度分布与火焰迁移,低过量空气系数或低流量易引发燃烧回火,高过量空气系数或高流量则会导致脱火风险;多孔介质渐变孔结构的热缓冲作用与催化反应的持续放热减缓了温度波动并提高了火焰稳定性。在φa=2.44~2.56与f=50~65 L/min,火焰锚定于燃烧器中游,燃烧温度维持在800℃以上,且NOx排放极低。在φa=2.56下,燃烧持续72 h预热区温度仍保持在220℃左右,CH4转化率接近100%,表明渐变多孔介质与催化反应的耦合显著提高了贫燃特性和稳定性。本研究为煤矿低浓度瓦斯的清洁高效利用提供了新的思路和技术支撑。 展开更多
关键词 低浓度甲烷 多孔介质催化燃烧 Fe-Co/Al(2)O3 燃烧特性 稳定性
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铁基混合磷酸盐材料Na3Fe2PO4P2O7的制备及其电化学储钠性能研究 认领 引用
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作者 安浩平 张伟 +1 位作者 刘国强 陈梁 《化工新型材料》 CAS CSCD 北大核心 2026年第8期181-184,191,共4页
聚阴离子类铁基混合磷酸盐Na3Fe2PO4P2O7正极材料具有较高的理论比容量、合适的工作电压和循环过程中较小的体积变化率等优点,但是合成条件较为苛刻,对原料的选择和煅烧温度的控制非常严格,较难得到纯相结构。此外,该材... 聚阴离子类铁基混合磷酸盐Na3Fe2PO4P2O7正极材料具有较高的理论比容量、合适的工作电压和循环过程中较小的体积变化率等优点,但是合成条件较为苛刻,对原料的选择和煅烧温度的控制非常严格,较难得到纯相结构。此外,该材料本征电子电导率低,影响电化学储钠性能的发挥。采用喷雾干燥法制备的铁基混合磷酸盐Na3Fe2PO4P2O7材料具有良好的电化学性能,在0.5C倍率下初次放电比容量为80.8mAh/g,在20C高倍率下比容量仍保持44.3mAh/g,在1C倍率下循环500圈后容量保持率为84.3%。此外,该材料还展现出良好的抗空气敏感性能。 展开更多
关键词 钠离子电池 喷雾干燥法 电化学性能 Na 3Fe 2PO_( 4)P 2O_( 7)
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Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2 认领 引用 被引量：1
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作者 Zexuan Yang Zhendong Ma +4 位作者 Yongjin Zou Cuili Xiang Lixian Sun Yongpeng Xia Yong Shen Chua 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期579-591,共13页
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic... Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions. 展开更多
关键词 MGH2 Dual heterojunction Ni/Ti3O5@graphene oxide
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Air-reactive cladding assisted brazing of Y2O3-MgO nanocomposite ceramic to TC4 alloy:Interfacial reaction mechanism and mechanical property 认领 引用
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作者 Ming Gao Bo Zhang +4 位作者 Lixia Zhang Zhan Sun Qing Chang Degang Li Jun Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第8期407-418,共12页
Y2O3-MgO nanocomposite ceramic,as a novel infrared window material,exhibits superior properties compared to traditional infrared window materials.To realize its engineering application in high-speed aircraft suc... Y2O3-MgO nanocomposite ceramic,as a novel infrared window material,exhibits superior properties compared to traditional infrared window materials.To realize its engineering application in high-speed aircraft such as unmanned aerial vehicles,the reliable joining between Y2O3-MgO nanocomposite ceramic and TC4 alloy is a key challenge.In this study,the surface of Y2O3-MgO nanocomposite ceramic was first clad in air using an Ag-CuO-Al2O3 filler,which achieved uniform spreading on the ceramic.Subsequently,vacuum brazing was successfully performed between the clad Y2O3-MgO nanocomposite ceramic and TC4 alloy using AgCu filler.The microstructure and mechanical properties of the brazed joints were studied in detail.The air-reactive cladding technique significantly improved wettability,reducing the wetting angle of the filler metal on Y2O3-MgO nanocomposite ceramic from 104°to 27°.The brazed joint interface treated with the Ag-CuO-Al2O3 cladding exhibited sound metallurgical bonding without defects.The main phases identified in the Y2O3-MgO ceramic-side reaction layer were Cu2Y2O5,Mg0.78Cu0.22O,and Y4Al2O9.Analysis and calculations reveal that Cu2Y2O5 and Mg0.78Cu0.22O are respectively formed by the reaction of CuO with Y2O3and MgO,while Y4Al2O9 results from the reaction between Al2O3 and Y2O3.The typical interfacial microstructure was:Y2O3-MgO/Cu2Y2O5+Mg0.78Cu0.22O+Y4Al2O9/CuxTi6-xO+Ag(s,s.)/Ti(s,s.)+Ti2Cu/TC4.The joint achieved a maximum shear strength of 66 MPa under optimal parameters of 24 mol%CuO in the cladding layer and a brazing parameters of 860°C for 20 min. 展开更多
关键词 Y2O3-MgO nanocomposite ceramic Ag-CuO-Al2O3 Air-reactive cladding Brazing Interfacial reaction
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尺寸控制的FeF3·0.33H2O多孔微球正极材料的制备及电化学性能研究 认领 引用
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作者 李继 李怡暄 +5 位作者 况知凡 甘振鉴 刘红英 王石泉 曾造 李琳 《湖北大学学报（自然科学版）》 CAS 2026年第1期1-10,共10页
以Fe(NO3)3·9H2O为铁源,氢氟酸(40%,质量分数)为氟源,通过调控溶剂中乙醇与聚乙二醇(PEG)的体积比,利用溶剂热及退火处理制备了3种不同粒径的FeF3·0.33H2O微球。探究了3种样品的结构、形貌以及电化学性能等方... 以Fe(NO3)3·9H2O为铁源,氢氟酸(40%,质量分数)为氟源,通过调控溶剂中乙醇与聚乙二醇(PEG)的体积比,利用溶剂热及退火处理制备了3种不同粒径的FeF3·0.33H2O微球。探究了3种样品的结构、形貌以及电化学性能等方面的不同。结果表明:聚乙二醇∶乙醇的体积比为1∶1时,所得产物(A-3)的尺寸最小,微球直径约为0.5μm。作为锂离子电池(LIBs)正极材料,在1.5~4.0 V的电压范围下,和A-1,A-2样品相比,A-3样品有更高的放电比容量和较好的循环性能与倍率性能。在0.1 C的电流密度下,循环50圈后仍有近200 mAh·g-1的可逆放电比容量。在1C电流密度下,循环300圈仍保持135 mAh·g-1。作为SIBs正极材料时,0.1 C下循环50圈可以保持145 mAh·g-1,在1C电流密度下循环300圈仍保持105 mAh·g-1。A-3良好的储锂储钠性能可以归因于制备的FeF3·0.33H2O晶体具有较小的尺寸和较大的比表面积,可以加快锂离子、钠离子的传输速度。制备的A-3样品可以作为较有潜力的锂/钠离子电池正极材料。 展开更多
关键词 锂离子电池 钠离子电池 正极材料 FeF3·0.33H2O 电化学性能
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Extrinsic Er2O3-inspired H2O adsorption and dissociation on surface of industrial fly ash-derived SiO2 aerogel in electrocatalytic CO2 reduction 认领 引用
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作者 Lifeng Han Haorun Li +10 位作者 Kunming Hou Yan Guo Hao Wu Mengbo Zou Yulu Wang Zhihua Guo Huangdong Wang Guixiang Ma Shangpeng Liu Xiaojun Gu Shanghong Zeng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期714-724,I0017,共11页
Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO_(2... Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO2RR).However,how to select and arrange active sites on its surface poses significant challenges due to its non-conductive nature.Here,we subtly designed and synthesized multi-component architectures to achieve the high efficiency of CO2RR to CO.The embedding of active and amorphous nitrogen-doped carbon(NC)nanosheets on the surface and inside of SiO2aerogel ensures the charge transport on the catalyst surface,and Er2O3improves dissociation of H2O,enabling the supply of protons for CO2RR.Simultaneously,Er2O3-induced defects/vacancies,nanoclusters coordinated with N on amorphous NC and single Ni in NC play crucial role in enhancing adsorption and activation of CO2.Consequently,the Ni-Er2O3/NC-SiO2catalyst exhibits the maintenance of FECOhigher than 95%over a wide potential window(-0.22 to-1.12 V vs.RHE)in a flow cell with gas-liquid-solid electrode.This work not only provides an atomistic understanding of nature of active sites in CO2RR but also contributes to the secondary utilization of industrial fly ash for a carbon-neutral future. 展开更多
关键词 Fly ash utilization SiO2aerogel Er2O3 H2O dissociation CO2electrochemical reduction
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Ionic potential mediated compositional-structural dual gradient engineering in P2/O3 cathodes for high-energy sodium storage 认领 引用
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作者 Zongyu Guan Meng Li +8 位作者 Ao Chen Jihuan Xie Aoci Yang Yang Gu Guoyao Pang Kuan Wang Weidong Zhuang Jiangtao Hu Biwei Xiao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期791-800,I0019,共10页
Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by rel... Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by relatively low energy density.Here,we report a scalable Mn-Fe-Ni layered oxide with a compositional-structural dual-gradient(DG)architecture synthesized via a three-step co-precipitation method.By exploiting the opposite roles of high-ionic-potential Mn and low-ionic-potential Fe in stabilizing the P2 and O3 frameworks,respectively,a pure compositional Mn/Fe gradient is translated into a structural P2/O3 gradient with precisely guided synthesis conditions.The Fe-deficient surface effectively suppressed Fe4+-induced side reactions,while the stable P2-type shell and the enlarged R value of the O3 core further enhanced cycling stability during structural evolution.The optimized cathode delivered an energy density of 478 Wh kg-1at 4.2 V,with 82%capacity retention after 200 cycles in half cells and 91%retention after 1600 cycles in full cells.This study demonstrates a viable pathway for developing high-energy-density and long-lifetime cathodes for sodium-ion batteries. 展开更多
关键词 Sodium-ion battery Cathode Double-gradient materials O3/P2 materials
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In2S3/HOF S-scheme heterojunction for enhanced photocatalytic H2O2 production 认领 引用
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作者 Yong Zhang Wenjun Zhu +1 位作者 Yanyan Zhao Shumin Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第5期261-273,共13页
As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their ... As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their practical application in photocatalytic H2O2production.To address the above challenges,this work employs a wet chemical method to grow In2S3nanosheets in situ on the surface of highly stable HOF nanorods(PFC-1),resulting in a novel inorganic/organic In2S3/PFC-1(IP)S-scheme heterojunction.The optimal IP composite achieves a significantly improved photocatalytic H2O2evolution rate of 3.78 mmol g-1h-1,which is 2.9-and 3.7-fold than that of In2S3and PFC-1,respectively.The elevated visible-light absorption,abundant active sites,and effective charge separation of IP S-scheme heterojunction result in the improvement in photocatalytic performance.Additionally,photocatalytic H2O2production of IP goes through a two-electron O2 reduction reaction pathway.This work offers a novel strategy for the fabrication of efficient HOF-based S-scheme heterostructures and their application in photocatalytic field. 展开更多
关键词 Hydrogen-bonded organic frameworks In2S3 S-scheme photocatalyst O2 reduction Photocatalytic H2O2production
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愈创木酚在Ni-Fe团簇/Al2O3界面上加氢脱氧的密度泛函理论研究 认领 引用
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作者 赵豪 代博文 +3 位作者 程崇博 卞凤杰 沈德魁 姜小祥 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2026年第7期128-136,共9页
为阐明双金属负载型催化剂在愈创木酚加氢脱氧反应中的协同机理,基于密度泛函理论构建了Ni/Al2O3和Ni-Fe/Al2O3模型,系统探究了愈创木酚的吸附活化及反应路径.结果表明,Fe的掺杂显著增强了金属-载体相互作用,从而提升了催... 为阐明双金属负载型催化剂在愈创木酚加氢脱氧反应中的协同机理,基于密度泛函理论构建了Ni/Al2O3和Ni-Fe/Al2O3模型,系统探究了愈创木酚的吸附活化及反应路径.结果表明,Fe的掺杂显著增强了金属-载体相互作用,从而提升了催化剂的结构稳定性.愈创木酚在两种催化剂上均优先发生脱甲基反应,Fe的引入特异性地活化了甲氧基C—O键,使其断裂能垒从1.20 eV降至0.84 eV,导致加氢脱氧反应的速率控制步骤由脱甲基反应转变为中间产物的加氢反应.对于中间体邻苯二酚的后续转化,Fe掺杂虽未改变优先脱羟基的主路径,但普遍升高了各基元步骤的能垒.电子结构分析揭示,Fe的高亲氧性驱动电子从金属团簇向载体迁移,导致金属团簇电子密度降低.这种电子重构效应在促进C—O键活化(脱氧)的同时,抑制了苯环加氢活性,为理解非贵金属催化剂的高选择性脱氧机理提供了理论依据. 展开更多
关键词 愈创木酚 Ni-Fe团簇 Al2O3载体 加氢脱氧 密度泛函理论
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Ni-O-Nd active structure over inverse Nd2O3/Ni catalyst enables efficient CO2 hydrogenation to methane 认领 引用
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作者 Mingxue Wang Junliang Xia +4 位作者 Yu Xie Jinyan Cao Jianjun Chen Qiulin Zhang Ping Ning 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期979-990,I0021,共12页
Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temper... Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temperatures.Herein,an inverse Nd2O3/Ni catalyst with Ni‑O‑Nd structures as catalytically active sites was facilely constructed.It achieved>80%CO2conversion with a CH4space‑time yield up to 143.4 mmol gcat-1h-1at 225℃and 1 bar,which far exceeded its counterpart(Nd2O3+Ni,27.8 mmol h-1),representing one of the state‑of‑the‑art CO2methanation catalysts.Systematic characterizations revealed that the well‑dispersed Nd species on Ni substrate over inverse Nd2O3/Ni enhanced Ni‑Nd2O3interaction and promoted the formation of Ni‑O‑Nd interface.Then,its surface basicity and local environment of Ni was greatly optimized,thus enhancing CO2adsorption and oxygenate hydrogenation abilities.In situ spectra and DFT calculations revealed that instead of the sole carbonyl pathway over Nd2O3+Ni,the Ni‑O‑Nd interface over the inverse Nd2O3/Ni brought a supplementary formate pathway with low energy barriers.Besides,it enabled lower energy barriers for CO2dissociation(0.30 vs 0.61 eV)and CO∗hydrogenation(0.70 vs 0.84 eV).Consequently,CO2activation and oxygenate hydrogenation ability over this inverse catalyst could be greatly enhanced,contributing to its excellent activity. 展开更多
关键词 CO2methanation Inverse Nd2O3/Ni catalyst Ni–O–Nd structure HCOO*and CO*pathway Oxygenate hydrogenation
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Formulation,stability,and synergistic characteristics of diesel-inwater Pickering emulsions stabilized by titanium carbide(Ti3C2Tx)MXene and Tween 40 认领 引用
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作者 Nansee S.K.Abu Zaid Aaminah Johar +2 位作者 Mustafa S.Nasser Khaled A.Mahmoud Sagheer A.Onaizi 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期393-421,共29页
Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems com... Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems combining nanoparticles and surfactants offer a promising route to achieving both interfacial stability and formulation efficiency.Among potential nanoparticle candidates,Ti3C2TxMXene exhibits high surface area and interfacial activity.However,its application in diesel-in-water Pickering emulsions under EOR-relevant conditions has not been explored.Challenges such as high hydrophilicity and strong electrostatic repulsion have limited the use of unmodified MXene as a standalone stabilizer in colloidal systems.To address this limitation,diesel-in-water Pickering emulsions were formulated using DL-Ti3C2TxMXene combined with Tween 40(0.5 wt%)and antifoam(0.15 wt%),aiming to investigate their synergistic stabilization behavior across MXene concentrations ranging from 0.1 to 1.5 wt%.The MXene-only system exhibited complete and immediate phase separation,whereas the hybrid emulsions demonstrated markedly enhanced stability,with no phase separation observed at 0.1 and 0.5 wt%after 24 h.A concentration-dependent trend was evident.At lower MXene contents,interfacial adsorption improved,and droplet sizes remained small and uniform.At higher concentrations(≥1.0 wt%),aggregation increased,and demulsification became more pronounced.Interfacial tension decreased steadily with increasing MXene content,reaching 0.86 mN/m at1.5 wt%,while zeta potential remained strongly negative(-47.7 mV at 0.5 wt%),indicating sufficient electrostatic repulsion.Rheological analysis revealed a transition to shear-thinning behavior at higher MXene contents,confirming the formation of internal network structures.Compared to other reported systems based on silica(SiO2),zinc oxide(ZnO),or functionalized MXenes,the MXene-Tween 40formulation achieved superior short-and long-term emulsion stability without requiring surface modification or external stimuli.To the best of our knowledge,this is the first study to report the successful stabilization of diesel-in-water Pickering emulsions using unmodified Ti3C2TxMXene.These findings highlight the synergistic interaction between MXene and Tween 40 and present a robust,surfactant-lean formulation suitable for oilfield applications. 展开更多
关键词 Titanium carbide(Ti3C2Tx)MXene nanosheets Oil-in-water(O/W)Pickering emulsions Tween 40 chemical surfactant Pickering emulsion characteristics Emulsion stability Emulsion rheology
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钠离子电池O3型NaNi1/3Fe1/3Mn1/3O2正极的研究进展与展望 认领 引用
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作者 李广贤 爱新觉罗·闿玉 +4 位作者 陈希至 邹之全 郭浩 孙凯 陈东风 《粉末冶金工业》 CAS 北大核心 2026年第2期193-202,共10页
O3型NaNi1/3Fe1/3Mn1/3O2(NFM111)层状氧化物作为钠离子电池正极材料的典型代表,具有高容量、低成本及合成工艺简单等优势,在钠离子电池领域具有广阔的应用前景。然而,其在充放电过程中的复杂相变、离子迁移、界面副反应等... O3型NaNi1/3Fe1/3Mn1/3O2(NFM111)层状氧化物作为钠离子电池正极材料的典型代表,具有高容量、低成本及合成工艺简单等优势,在钠离子电池领域具有广阔的应用前景。然而,其在充放电过程中的复杂相变、离子迁移、界面副反应等问题,严重制约了循环稳定性与快充性能。本文从元素掺杂、表面包覆、形貌与微结构调控3个方面介绍了NaNi1/3Fe1/3Mn1/3O2材料的研究进展,元素掺杂通过引入异质离子,稳定体相结构,抑制有害相变并拓宽钠离子扩散通道;表面包覆构建界面保护层,隔绝电解液侵蚀并提升空气稳定性;形貌与微结构调控通过单晶化、浓度梯度设计等方法增强材料的结构稳定性和循环稳定性。最后,从多策略协同改性、理论计算和人工智能辅助筛选等方面展望了O3型NaNi1/3Fe1/3Mn1/3O2的发展方向。 展开更多
关键词 钠离子电池 O3型NaNi1/3Fe1/3Mn1/3O2 元素掺杂 表面包覆 形貌与微结构调控
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乙醇溶剂体积对Ni-Fe/γ-Al2O3催化剂微波热解高密度聚乙烯制氢性能的影响 认领 引用
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作者 魏家荣 谢翔 +5 位作者 周志彬 雷丁懿 李嘉墀 卢林博 侯丽敏 张智羽 《塑料工业》 CAS CSCD 北大核心 2026年第6期159-166,共8页
微波热解因反应速率快、能效高,被认为是塑料废弃物资源化制氢的重要途径,其中催化剂制备工艺对制氢性能具有关键影响。以Ni-Fe/γ-Al2O3;为研究对象,系统考察乙醇体积(0、25、50、75mL)对催化剂结构及其在高密度聚乙烯(HDPE)微... 微波热解因反应速率快、能效高,被认为是塑料废弃物资源化制氢的重要途径,其中催化剂制备工艺对制氢性能具有关键影响。以Ni-Fe/γ-Al2O3;为研究对象,系统考察乙醇体积(0、25、50、75mL)对催化剂结构及其在高密度聚乙烯(HDPE)微波热解制氢过程中的性能影响。结果表明,不同体积的乙醇可调控活性组分在γ-Al2O3;载体上的分散状态及物相结构,显著影响催化剂制氢性能。当乙醇体积为25mL时,Ni、Fe活性组分分散均匀,形成稳定的FeAl2O3和NiFe2O4复合活性结构,HDPE热解的氢气产量、氢气效率及氢气体积分数分别达到49.7mmol/g、69.6%和82.7%。乙醇用量不足或过量均会导致活性组分分布不均或团聚脱落,从而削弱制氢性能。该研究表明,合理调控乙醇体积是优化Ni-Fe/γ-Al2O3,催化剂制备工艺、提升微波热解塑料制氢效率的有效途径。 展开更多
关键词 Ni-Fe/γ-Al2O3催化剂 乙醇溶剂 微波热解 高密度聚乙烯 制氢性能
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