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Holey platinum nanotubes for ethanol electrochemical reforming in aqueous solution

Science Bulletin 2021年第20期66卷 2079-2089,M0003页

作者： Tian-Jiao Wang Hui-Ying Sun Qi Xue Ming-Jun Zhong Fu-Min Li Xinlong Tian Pei Chen Shi-Bin Yin Yu Chen key laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062China State key laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China MOE key laboratory of New processing Technology for non-ferrous metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

The catalytic/electrocatalytic performance of platinum(Pt)nanostructures highly relates to their ***,we propose a facile self-template pyrolysis strategy at high temperature to synthesize one-dimensionally holey Pt nanotubes(Pt-hNTs)using Pt^(Ⅱ)-dimethylglyoxime complex(Pt^(Ⅱ)-DMG)nanorods as the reaction *** coordination capability of DMG results in the generation of Pt^(Ⅱ)-DMG nanorods,whereas the reducibility of DMG at high temperature leads to the reduction of Pt^(Ⅱ)species in Pt^(Ⅱ)-DMG *** the reaction process,the inside-out Ostwald ripening phenomenon leads to the hollow morphology of *** from the physical characteristics of hollow and holey structure,Pt-hNTs with clean surface show superior electroactivity and durability for catalyzing ethanol electrooxidation as well as hydrogen evolution reaction in alkaline *** optimized experimental conditions,the constructed symmetric Pt-hNTs||Pt-hNTs ethanol electrolyzer only requires an electrolysis voltage of 0.40 V to achieve the electrochemical hydrogen production,demonstrating a highly energy saving strategy relative to traditional water electrolysis.

关键词： Holey platinum nanotubes High temperature pyrolysis Ethanol electrochemical reforming Ethanol oxidation reaction Hydrogen production

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Corrosion Mechanism and Corrosion Model of Mg-Y Alloy in NaCl Solution

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Journal of Wuhan University of Technology(Materials Science) 2016年第5期31卷 1048-1062页

作者：徐宏 WU Zhiquan WANG Xiaoru 张新 REN Jiping SHI Yang WANG Zepu WANG Liwei LIU Changhua School of Materials Science and Engineering North University of China Taiyuan 030051 China Institute of Thermal Power Generation Technology China Datang Coporation Science and Technology Research Institute Beijing 102206 China Century College Beijing University of Posts and Telecommunications Beijing 102101 China State key lab for Fabrication & processing of non-ferrous metals Beijing General Research Institute for Non-ferrous Metals Beijing 100088 China Shenyang Area Military Representative Office of Armored Military Representative Office Chinese PLA General Armament Department Shenyang 110016 China Center of Science and Technology Beijing North Vehicle Group Corporation Beijing 100072 China

Corrosion of Mg–Y alloy was studied using electrochemical evaluations, immersion tests and SEM observations. Corrosion mechanisms of Mg-（0.25 and 2.5） Y alloy and Mg-（5, 8, and 15） Y alloy were uniform corrosion and pitting corrosion respectively, and the content of Mg_（24）Y_5 phases determined its effect acting as cathode to accelerate the corrosion or corrosion barrier to inhibit the corrosion. Corrosion resistance of Mg-（0.25, 2.5, 5, 8, and 15） Y alloys was as follows： Rt（Mg-0.25Y）〈 Rt（Mg-8Y）〈 Rt（Mg-15Y）〈 Rt（Mg-5Y）〈 Rt（Mg-2.5Y）. Y could significantly improve the corrosion resistance of the Mg-Y alloy, but the excess of Y deteriorated the corrosion resistance of the Mg-Y alloy. The optimum content of Y in the studied alloys was 2.5%.

关键词： Mg-Y corrosion electrochemical weight loss rate

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Design of high-performance molybdenum alloys via doping metal oxide and carbide strengthening:A review

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Journal of Materials Science & Technology 2023年第29期160卷 161-180页

作者： Hairui Xing Ping Hu Chaojun He Xiangyang Zhang Jiayu Han Fan Yang Run Bai Wen Zhang Kuaishe Wang Alex AVolinsky School of metallurgy Engineering Xi’an University of Architecture and TechnologyXi’an 710055China National and Local Joint Engineering Research Center for Functional Materials processing Xi’an University of Architecture and TechnologyXi’an 710055China Northwest Institute for non-ferrous metal Research Xi’an 710016China Department of Mechanical Engineering University of South Florid14202 E.Fowler Ave.ENG 030Tamp1FL 33620USA

metal oxide and carbide strengthening molybdenum(Mo)alloys have been designed as promising ad-vanced materials in refractory metals to solve some of the core engineering problems in superalloy ***,there is a need to summarize the results obtained and evaluate the opportunities for preparing high-performance Mo alloys by strengthening metal oxides and carbides to improve the per-formance characteristics of Mo metal *** paper reviews the results of the reported work con-cerning the structure and properties of Mo alloys with different metal oxide and carbide strengthening methods added to Mo *** influence of the doping of La 2 O 3 and Y 2 O 3 particles,ceramic Al 2 O 3 and ZrO 2 particles,and refractory TiC and ZrC carbides particles of Mo alloys are *** impacts of particle morphology,size,distribution and volume fractions of oxide and carbide are analyzed,as well as the specific features of different doping techniques for obtaining high-performance Mo alloys *** work will guide future research on the design of high-performance refractory Mo alloys by adding oxides and carbide particles,helping to solve the core issues in the field of superalloy application research.

关键词： Molybdenum alloy metal oxide and carbide addition Oxide dispersion-strengthened Carbide precipitation-strengthened Microstructure Mechanical properties

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MoC nanocrystals confined in N-doped carbon nanosheets toward highly selective electrocatalytic nitric oxide reduction to ammonia

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Nano Research 2022年第10期15卷 8890-8896页

作者： Ge Meng Mengmeng Jin Tianran Wei Qian Liu Shusheng Zhang Xianyun Peng Jun Luo Xijun Liu key laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Institute for New Energy Materials and Low-Carbon Technologies Tianjin Key Lab for Photoelectric Materials&DevicesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China MOE key laboratory of New processing Technology for non-ferrous metals and Materials and Guangxi Key Laboratory of Processing for NonFerrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China Institute for Advanced Study Chengdu UniversityChengdu 610106China College of Chemistry Zhengzhou UniversityZhengzhou 450000China Institute of Zhejiang University–Quzhou Quzhou 324000China

Electrochemical nitric oxide reduction reaction(NORR)to produce ammonia(NH3)under ambient conditions is a promising alternative to the energy and carbon-intensive Haber–Bosch approach,but its performance is still ***,molybdenum carbides(MoC)nanocrystals confined by nitrogen-doped carbon nanosheets are first designed as an efficient and durable electrocatalyst for catalyzing the reduction of NO to NH3 with maximal Faradaic efficiency of 89%±2%and a yield rate of 1,350±15μg·h^(−1)·cm^(−2) at the applied potential of−0.8 V *** hydrogen electrode(RHE)as well as high stable activity with negligible current density and NH3 yield rate decays over a 30 h continue the ***,as a proof-of-concept of Zn–NO battery,it achieves a peak power density of 1.8 mW·cm^(−2) and a large NH3 yield rate of 782±10μg·h^(−1)·cm^(−2),which are comparable to the best-reported *** calculations reveal that the MoC(111)has a strong electronic interaction with NO molecules and thus lowering the energy barrier of the potential-determining step and suppressing hydrogen evolution *** work suggests that Mo-based materials are a powerful platform providing great opportunities to explore highly selective and active catalysts for NH3 production.

关键词： ammonia electrosynthesis green route molybdenum carbides(MoC)nanocrystals nitric oxide reduction reaction high selectivity

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Effect of phosphate-based sealing treatment on the corrosion performance of a PEO coated AZ91D mg alloy

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Journal of Magnesium and alloys 2020年第4期8卷 1328-1340页

作者： Kun Qian Weizhou Li Xiaopeng Lu Xinxin Han Yong Jin Tao Zhang Fuhui Wang School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Guangxi key laboratory of processing non-ferrous metals and Features Materials Guangxi UniversityNanning 530004China Shenyang National laboratory for Materials Science Northeastern University3-11 Wenhua RoadShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

This study investigated the effect of sealing treatment on the corrosion performance of plasma electrolytic oxidation(PEO)coated AZ91D Mg alloy with and without addition of corrosion *** microstructure,phase composition and corrosion property of the sealed and unsealed coatings were evaluated by using scanning electron microscopy(SEM),energy dispersion spectroscopy(EDS),x-ray diffraction(XRD),x-ray photoelectron spectroscopy(XPS),polarization,and electrochemical impedance spectroscopy(EIS)*** experiments and salt spray tests showed that,after sealing in phosphate solution containing corrosion inhibitor,the corrosion current density of PEO-coated AZ91D decreased more than 10-fold and the anti-corrosion time in a salt spray environment increased more than *** corrosion rate of the PEO coating slowed down due to the releasing and adsorbing of the corrosion inhibitors in the pores and cracks of the coating during the corrosion process.

关键词： AZ91D magnesium alloy:Plasma electrolyte oxidation Sealing treatment Corrosion inhibitor

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Electrochemical deposition of Mg(OH)_(2)/GO composite films for corrosion protection of magnesium alloys

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Journal of Magnesium and alloys 2015年第3期3卷 231-236页

作者： Fengxia Wu Jun Liang Weixue Li State key laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China State key laboratory of Advanced processing and Recycling of non-ferrous metals Lanzhou University of TechnologyLanzhou 730050China School of Science Lanzhou University of TechnologyLanzhou 730050China

Mg(OH)_(2)/graphene oxide(GO)composite film was electrochemical deposited on AZ91D magnesium alloys at constant *** characteristics of the Mg(OH)_(2)/GO composite film were investigated by scanning electron microscope(SEM),energy-dispersive X-ray spectrometry(EDS),X-ray diffractometer(XRD)and Raman *** was shown that the flaky GO randomly distributed in the composite *** with the Mg(OH)_(2)film,the Mg(OH)_(2)/GO composite film exhibited more uniform and compact *** polarization tests revealed that the Mg(OH)_(2)/GO composite film could significantly improve the corrosion resistance of Mg(OH)_(2)film with an obvious positive shift of corrosion potential by 0.19 V and a dramatic reduction of corrosion current density by more than one order of magnitude.

关键词： Thin films Coating Electrochemical techniques Corrosion

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Emerging strategies and developments in oxygen reduction reaction using high-performance platinum-based electrocatalysts

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Nano Research 2024年第5期17卷 3516-3532页

作者： Asad Ali Aatto Laaksonen Guo Huang Shahid Hussain Shuiping Luo Wen Chen Pei Kang Shen Jinliang Zhu Xiaoyan Ji Energy Engineering Division of Energy ScienceLuleåUniversity of Technology97187 LuleåSweden Department of Materials and Environmental Chemistry Arrhenius LaboratoryStockholm UniversitySE-10691 StockholmSweden Center of Advanced Research in Bionanoconjugates and Biopolymers “Petru Poni”Institute of Macromolecular ChemistryIasi 700469Romania State key laboratory of Materials-Oriented and Chemical Engineering Nanjing Tech UniversityNanjing 211816China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China School of Resources Environment and MaterialsState Key Laboratory of Processing for Non-ferrous Metal and Featured MaterialsGuangxi UniversityNanning 530004China

The global practical implementation of proton exchange membrane fuel cells(PEMFCs)heavily relies on the advancement of highly effective platinum(Pt)-based electrocatalysts for the oxygen reduction reaction(ORR).To achieve high ORR performance,electrocatalysts with highly accessible reactive surfaces are needed to promote the uncovering of active positions for easy mass *** this critical review,we introduce different approaches for the emerging development of effective ORR electrocatalysts,which offer high activity and *** strategies,including morphological engineering,geometric configuration modification via supporting materials,alloys regulation,core-shell,and confinement engineering of single atom electrocatalysts(SAEs),are discussed in line with the goals and requirements of ORR performance *** review the ongoing development of Pt electrocatalysts based on the syntheses,nanoarchitecture,electrochemical performances,and *** eventually explore the obstacles and research directions on further developing more effective electrocatalysts.

关键词： oxygen reduction reaction(ORR) Pt-based electrocatalysts proton exchange membrane fuel cells(PEMFCs) morphology and alloys strategies single atom electrocatalysts(SAEs)

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Corrosion and Electrochemical Behaviors of As-cast Mg-8Y and Mg-5Y-7Gd-1Nd-0.5Zr Magnesium alloys in NaCl Aqueous Solution

Corrosion and Electrochemical Behaviors of As-cast Mg-8Y and...

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中国材料大会2012

作者： Xin Zhang Xia Deng Kui Zhang Xinggang Li Yang Shi Yulong Zhang Min Peng Lingying Kong State key lab for Fabrication & processing of non-ferrous metals Military Representative Office of People's Liberation Army Stationed in 618 factory

ISBN: (纸本)9783037856086

The corrosion mechanisms of as-cast Mg-8Y and Mg-5Y-7Gd-1Nd-0.5Zr Mg alloys in 5% NaCl aqueous solution were investigated by electrochemical testing and SEM observation. The electrochemical results indicated that the corrosion resistance of Mg-8Y and Mg-5Y-7Gd-1Nd-0.5Zr alloys in 5% NaCl aqueous solution gradually deteriorated with increasing of immersion time expect for 2h and 24h immersion. The Cl- anion led to the initiation and development of the corrosion pits. The cathodic reaction was driven by hydrogen evolution reaction. The presence of filiform corrosion also proved a resistant oxide film naturally formed on the surface of Mg-8Y and Mg-5Y-7Gd-1Nd-0.5Zr alloys. The corrosion resistance of Mg-5Y-7Gd-1Nd-0.5Zr was better than Mg-8Y.

关键词： Mg-5Y-7Gd-1Nd-0.5Zr Mg-8Y Corrosion behavior Electrochemical

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Double-Shelled L1_(2) Nano-structures in Quaternary Al–Er–Sc–Zr alloys: Origin and Critical Significance

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Acta metallurgica Sinica(English Letters) 2021年第9期34卷 1277-1284页

作者： Chao-Min Zhang Pan Xie Yong Jiang Sheng Zhan Wen-Quan Ming Jiang-Hua Chen Ke-Xing Song Hao Zhang School of Materials Science and Engineering Henan Key Laboratory of Non-Ferrous Materials Science&Processing TechnologyHenan University of Science and TechnologyLuoyang 471023China School of Materials Science and Engineering Central South UniversityChangsha 410083China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Jiangsu Haoran Spray Forming Alloy Co. LtdZhenjiang 212132China

The formation of highly coherent double-shelled L1_(2) nano-precipitates in dilute Al–Er–Sc–Zr alloys was investigated with the combined use of Cs-corrected transmission electron microscopy characterization and first-principles energetics calculations. The double-shelled nano-precipitates are primarily featured with an Er-rich core surrounded by a Sc-rich inner shell and a Zr-rich outer shell. First-principles energetics analyses based on the classic homogenous nucleation theory suggested that once forms, this double-shell structure can be thermally stable. The predominant formation of this double-shell structure has thus both profound kinetic and thermodynamic origins. Its formation and stability preference to all other possible L1_(2) nano-structures would become more pronounced as its size increases, no matter what the solute ratio and aging temperature of interest.

关键词： Al alloys Core–shell L12 nano-phase First-principles

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Constitutive modeling of flow behavior and processing maps of Mg-8.1 Gd-4.5Y-0.3Zr alloy

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Journal of Magnesium and alloys 2020年第3期8卷 917-928页

作者： Xiangsheng Xia Kui Zhang Minglong Ma Ting Li State key laboratory of non-ferrous metals and Processes GRINM Co.Ltd.Beijing 100088China GRIM AT Engineering Institute Co. LtdBeijing 101400China General Research Institute for non-ferrous metals Beijing 100088China Southwest Technology and Engineering Research Institute Chongqing 400039China National Center of Analysis and Testing for nonferrous metals and Electronic Materials China United Test&Certification Co.Ltd.GRINM Group Co.LtdBeijing 100088China

High temperature deformation behavior and workability of Mg-8.1 Gd-4.5Y-0.3Zr alloy were studied by compression *** equation with strain compensation and processing maps were *** results show that the activation energy Q,structure factor a,n and In A varies with the strain,its relationship fit well by fifth order *** flow stresses predicted by the extracted model are in good agreement with the experimental *** are five typical domains in the processing map,and the deformation mechanisms in different domains were determined by microstructure *** feasible processing window of the alloy is in the areas of 400-500℃/0.001-0.1 s^(-1).

关键词： Mg-Gd-Y-Zr alloy Workability Strain compensation processing map

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