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Highly selective photocatalytic CO_(2) reduction to ethylene in pure water by Nb_(2)O_(5) nanoparticles with enriched surface –OH groups under simulated solar illumination

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Journal of advanced Ceramics 2023年第8期12卷 1641-1654页

作者： Haoyu Zhang Shuang Gao Haitao Guan Weiyi Yang Qi Li Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Photocatalytic CO_(2) reduction to valuable chemical compounds could be a promising approach for carbon-neutral *** this work,a simple and robust thermal decomposition process was developed with ammonium carbonate((NH4)2CO3)as both precipitation agent and sacrificial template to produce fine Nb_(2)O_(5) nanoparticles with the rich existence of surface hydroxyl(–OH)*** was found by density functional theory(DFT)calculations and experiments that the rich existence of the surface–OH groups enhanced the adsorption of both reactants(CO_(2) and H_(2)O molecules)for the photocatalytic CO_(2) reduction on these fine Nb_(2)O_(5) nanoparticles,and the highly selective conversion of CO_(2) to the high-value chemical compound of ethylene(C_(2)H_(4),~68μmol·g^(−1)·h^(−1) with~100%product selectivity)was achieved under simulated solar illumination without usage of any sacrificial agents or noble metal *** synthesis process may also be readily applied as a surface engineering method to enrich the existence of the surface–OH groups on various metal oxide-based photocatalysts for a broad range of technical applications.

关键词： photocatalytic CO_(2)reduction niobium oxide nanoparticles thermal decomposition surface hydroxyl(-OH)groups simulated solar illumination

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Effect of oxygen addition and annealing time on microstructure and mechanical properties of Ti-34Nb alloy

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Journal of Iron and Steel Research International 2023年第1期30卷 158-164页

作者： Jun-shuai Wang Wen-long Xiao Lei Ren Yu Fu Chao-li Ma Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

The effect of oxygen addition and annealing time on microstructure and mechanical properties of Ti-34Nb and Ti-34Nb-0.2O alloys was *** addition of O suppresses the martensitic *** phase composition changes from singleα''phase toα''+βphases with oxygen *** addition of oxygen increases strength significantly at as-received,cold-rolled,and annealed alloys through solid solution *** accumulation of abundance of defects and grain refinement introduced by cold rolling have a significant strengthening effect but also damage *** addition of oxygen increasesα/βtransformation temperature and promotes the precipitation ofαphase during annealing in Ti-34Nb-0.2O alloy.αprecipitates can inhibit grain growth during *** strength decreases with annealing time increased due to the increase in grain size in Ti-34Nb alloy,while the strength increases in Ti-34Nb-0.2O alloy mainly due to the precipitation ofα*** cold rolling followed by annealing and addition of oxygen can improve the properties of alloys.

关键词： Titanium alloy Oxygen addition Annealing time αprecipitate

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Recent Advances in High‑Efficiency Electrocatalytic Water Splitting Systems

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Electrochemical Energy Reviews 2023年第1期6卷 1-38页

作者： Xian‑Wei Lv Wen‑Wen Tian Zhong‑Yong Yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) School of Materials Science and EngineeringNankai UniversityTianjin 300350China

Electrocatalytic water splitting driven by renewable energy input to produce clean hydrogen(H_(2))has been widely considered a prospective approach for a future hydrogen-based ***,the development of industrial alkaline water electrolyzers is hindered due to their unfavorable thermodynamics with high overpotential for delivering the whole process,caused by sluggish kinetics involving four-electron *** exploration of water electrolysis with low energy consumption and high efficiency is urgently required to meet the ever-growing energy storage and portfolio *** review emphasizes the strategies proposed thus far to pursue high-efficiency water electrolysis systems,including from the aspects of electro-catalysts(from monofunctional to bifunctional),electrode engineering(from powdery to self-supported),energy sources(from nonrenewable to renewable),electrolytes(from pure to hybrid),and cell configurations(from integrated to decoupled).Critical appraisals of the pivotal electrochemistry are highlighted to address the challenges in elevating the overall efficiency of water ***,valuable insights for the future development directions and bottlenecks of advanced,sustainable,and high-efficiency water splitting systems are outlined.

关键词： Electrocatalytic water splitting Hydrogen-based society Electrode engineering Cell configurations Challenges and perspectives

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A room-temperature magnetic semiconductor from a Co-Fe-Nb-B metallic glass

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science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 94-99页

作者： Yu-Zhang Jiao Dmitry VLouzguine-Luzgin Ke-Fu Yao Zheng-Jun Zhang Na Chen Laboratory for Advanced Materials Processing Technology(MOE) State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials(MOE) Schoolof Materials Science and EngineeringTsinghua UniversityBeijing 100084China Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan Mathematics for Advanced Materials-OIL National Institute of Advanced Industrial Science and Technology(AIST)Sendai 980-8577Japan

Magnetic semiconductors with Curie temperatures higher than room temperature show potential for developing spintronic devices with combined data processing and storage functions for next-generation computing *** this study,we present an n-type Co_(19.8)Fe_(8.6)Nb_(4.3)B_(6.0)O_(61.3) magnetic semiconductor with a high Curie temperature of~559 *** magnetic semiconductor has a room-temperature resistivity of~2.10×10^(4)Ωcm and a saturation magnetization of~76 emu/cm^(3).The n-type Co_(19.8)Fe_(8.6)Nb_(4.3)B_(6.0)O_(61.3)magnetic semiconductor was deposited on p-type silicon to form a heterojunction,exhibiting a rectifying *** results provide the design principles for discovering high Curie temperature magnetic semiconductors with determined conduction types,which would play an essential role in realizing nonvolatile spin-based transistors that break free from the confines of currently established Si-based information technology.

关键词： magnetic semiconductor ferromagnetic metallic glass high Curie temperature

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Alkyl-linked TiO_(2)@COF heterostructure facilitating photocatalytic CO_(2)reduction by targeted electron transport

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Chinese Journal of Structural Chemistry 2024年第12期43卷 13-19页

作者： Jiangqi Ning Junhan Huang Yuhang Liu Yanlei Chen Qing Niu Qingqing Lin Yajun He Zheyuan Liu Yan Yu Liuyi Li Key Laboratory of Eco-materials Advanced Technology College of Materials Science and EngineeringFuzhou UniversityFuzhou350108PR China

Targeted electron transfer to catalytically active site for CO_(2)reduction is promising for enhancing the efficiency of artificial ***,we demonstrate a design of an alkyl-linked heterostructure composing of TiO_(2)and a Cu-porphyrin-based covalent organic framework(TiO_(2)@CuPorTT-COF)for the photoreduction of CO_(2)with H_(2)*** specific coordination effect,the alkyl chain bridges TiO_(2)and Cu moiety in *** light illu-mination,the photoinduced electrons in TiO2 can be directionally transported across the interface along the alkyl chain to the Cu active sites to reduce adsorbed CO_(2),while the left holes are consumed by the H_(2)O oxidation,enhancing the spatial separation and utilization of electron-hole ***,the TiO_(2)@CuPorTT-COF enables remarkably superior catalytic activities over the counterpart without the alkyl bridge for electron transfer with 5 times of CO production *** apparent quantum efficiency of 0.455%at 380 nm is ***,a dynamic evolution of Cu active site for CO_(2)reduction is revealed,which can be promoted by the targeting electron transport *** work provides a targeted electron transport strategy for constructing photocatalysts.

关键词： Covalent organic framework Photocatalysis Reduction of CO_(2) Heterostructure Targeted electron transport

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Oxidation behavior and microstructural evolution of FeCoNiTiCu five-element high-entropy alloy nanoparticles

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Journal of materials science & Technology 2024年第10期177卷 133-141页

作者： H.Bai R.Su R.Z.Zhao C.L.Hu L.Z.Ji Y.J.Liao Y.N.Zhang Y.X.Li X.F.Zhang Key Laboratory for Anisotropy and Texture of Materials(MOE) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Institute of Advanced Magnetic Materials College of Materials and Environmental EngineeringHangzhou Dianzi UniversityHangzhou310012China

High-entropy alloys(HEAs)have attracted extensive attention ascribed to their unique physical and chemical properties induced by the cocktail ***,their oxidation behaviors,in particular at nanoscale,are still lack because of multi-element complexity,which could also be completely differ-ent from the bulk *** this work,we synthesized FeCoNiTiCu five-element HEA nanopar-ticles(NPs)with uniform elemental distribution by arc-discharging approach,and further investigated their oxidation behaviors at 250 ℃,and 350 ℃.The morphology,structure and element distribution of NPs were analyzed by transmission electron microscopy(TEM),energy dispersive spectroscopy(EDS)and electron energy loss spectroscopy(EELS).The surface oxidation in FeCoNiTiCu NPs during the high-temperature process can induce nanoscale pores at core/shell interfaces by Kirkendall effect,and even the eventual coalescence into a single ***,the oxidation states of NPs with diameters(d)varying from 60 to 350 nm were analyzed in detail,revealing two typical configurations:hollow(d<150 nm)and yolk-shell structures(d>150 nm).The experimental results were complemented by first-principles calculations to investigate the diffusion behaviors of five elements,evidencing that the surface oxidation strongly alters the surface segregation preferences:(1)in the initial stage,Cu and Ni appear to prefer segregating on the surface,while Co,Ti and Fe tend to stay in the bulk;(2)in the oxidation process,Cu prefers to stay in the center,while Ti segregates to the surface ascribed to the reduced po-tential *** study gives new insights into oxidation of nanoscale HEA,and also provides a way for fabrication of high-entropy oxides with controllable architectures.

关键词： High-entropy alloy Nanoparticles Oxidation Kirkendall effect Exchange bias effect

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Ultrasonic-assisted Hydrothermal Synthesis Autoclaved Bricks from Municipal Solid Waste Incineration Fly Ash and Coal Fly Ash(MSWI-FA)

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Journal of Wuhan University of Technology(materials science) 2025年第2期40卷 439-448页

作者： GUO Xiaolu HU Jiajun WANG Cheng Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Materials Science and Technology Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China

Municipal solid waste incineration fly ash(MSWI)is considered as one of the hazardous wastes and requires to be well disposed to reduce the contaminant to the *** to the production of coal fly ash(FA)bricks,MSWI and FA were utilized to prepare autoclaved MSWI-FA block ***-assisted hydrothermal synthesis technology was used for production to explore the effect of ultrasonic *** strength,dry density,and water absorption tests were conducted to determine the optimal ultrasonic *** pre-treating mechanisms were investigated by SEM,FT-IR,particle size analysis,and ***,the micro-analyses of block samples were *** heavy metal leaching concentration was studied to assess the environmental *** experimental results show that the ultrasonic pre-treating time,water bath temperature,and ultrasonic power of 3 h,30℃,and 840 W are the optimal,under which the compressive strength,dry density,and water absorption were 8.14 MPa,1417.48 kg/m^(3),and 0.38,*** is shown that ultrasound destroys the surface structure of raw materials and smaller FA particles embed into *** particle size distribution of pre-treated raw materials mixture is wider and total pore volume is decreased by 6.3%.During hydrothermal processing,more Al-substituted tobermorite crystals are generated,which is the main source of higher strength and smaller pore volume of prepared block *** solidification/stabilization rates of Cu,Pb,and Zn increased by 30.77%,4.76%,and 35.29%,*** study shows a feasible way to utilize MSWI as raw material for construction.

关键词： municipal solid waste incineration fly ash coal fly ash ultrasonic pre-treatment hydrothermal synthesis environmental safety

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Space environment adaptability of 2D semiconductor materials

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National science Review 2025年第4期12卷 91-93页

作者： Lingxiao Yu Shiran Sun Yi Jia Feiyu Kang Ruitao Lv State Key Laborotary of New Ceramic Materials School of Materials Science and EngineeringTsinghua University China Academy of Aerospace Science and Innovation Shenzhen Geim Graphene Center Institute of Materials Research Tsinghua Shenzhen International Graduate School Tsinghua University Key Laboratory of Advanced Materials MOE School of Materials Science and Engineering Tsinghua University

Space exploration plays a pivotal role in advancing human technological progress and deepening our understanding of the universe [1]. Satellites, as key instruments in space exploration, not only play an essential role in communication, navigation and meteorological monitoring,but also provide indispensable data for scientific research, environmental monitoring and national security.

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Effect of bipolar-plates design on corrosion,mass and heat transfer in proton-exchange membrane fuel cells and water electrolyzers:A review

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International Journal of Minerals,Metallurgy and materials 2024年第7期31卷 1599-1616页

作者： Jiuhong Zhang Xiejing Luo Yingyu Ding Luqi Chang Chaofang Dong Key Laboratory for Corrosion and Protection(MOE) Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing 100083China

Attaining a decarbonized and sustainable energy system,which is the core solution to global energy issues,is accessible through the development of hydrogen ***-exchange membrane water electrolyzers(PEMWEs)are promising devices for hydrogen production,given their high efficiency,rapid responsiveness,and *** plates account for a relatively high percentage of the total cost and weight compared with other components of ***,optimization of their design may accelerate the promotion of *** paper reviews the advances in materials and flow-field design for bipolar ***,the working conditions of proton-exchange membrane fuel cells(PEMFCs)and PEMWEs are compared,including reaction direction,operating temperature,pressure,input/output,and ***,the current research status of bipolar-plate substrates and surface coatings is summarized,and some typical channel-rib flow fields and porous flow fields are ***,the effects of materials on mass and heat transfer and the possibility of reducing corrosion by improving the flow field structure are ***,this review discusses the potential directions of the development of bipolar-plate design,including material fabrication,flow-field geometry optimization using threedimensional printing,and surface-coating composition optimization based on computational materials science.

关键词： bipolar-plates flow design mass and heat transfer corrosion water electrolyzers fuel cells

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An MOF-Based Single-Molecule Propylene Nanotrap for Benchmark Propylene Capture from Ethylene

Chem and Bio Engineering

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Chem and Bio engineering 2024年第11期1卷 952-959页

作者： Wang, Jia-Xin Zhang, Teng-Fei Pei, Jiyan Liu, Di Wang, Yu-Bo Gu, Xiao-Wen Qian, Guodong Li, Bin State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China

Highly selective capture and separation of propylene (C3H6) from ethylene (C2H4) presents one of the most crucial processes to obtain pure C2H4 in the petrochemical industry. The separation performance of current physisorbents is commonly limited by insufficient C3H6 binding affinity, resulting in poor low-pressure C3H6 uptakes or inadequate C3H6/C2H4 selectivities. Herein, we realize a unique single-molecule C3H6 nanotrap in an ultramicroporous MOF material (Co(pyz)[Pd(CN)4], ZJU-74a-Pd), exhibiting the benchmark C3H6 capture capacity at low-pressure regions. This MOF-based nanotrap features the sandwichlike strong multipoint binding sites and the perfect size match with C3H6 molecules, providing an ultrastrong C3H6 binding affinity with the maximal Qst value (55.8 kJ mol-1). This affords the nanotrap to exhibit one of the highest C3H6 uptakes at low pressures (60.5 and 103.8 cm3 cm-3 at 0.01 and 0.1 bar) and record-high C3H6/C2H4 selectivity (23.4). Theoretical calculations reveal that the perfectly size-matched pore cavities combined with sandwichlike multibinding sites enable this single-molecule C3H6 nanotrap to maximize the C3H6 binding affinity, mainly accounting for its record low-pressure C3H6 capture capacity and selectivity. Breakthrough experiments further confirm its excellent separation capacity for actual 1/99 and 50/50 C3H6/C2H4 mixtures, affording the remarkably high pure C2H4 productivities of 17.1 and 3.4 mol kg-1, respectively. © 2024 The Authors. Co-published by Zhejiang University and American Chemical Society.

关键词： Binding sites

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