Boosting alkaline hydrogen electrooxidation on an unconventional fcc-Ru polycrystal

查看全文 作　　者：Tonghui [1]Zhao;Dongdong [2]Xiao;Yi [1]Chen;Xi [3]Tang;Mingxing [1]Gong;Shaofeng [1]Deng;Xupo [1]Liu;Jianmin [3,4]Ma;Xu [1]Zhao;Deli [1]Wang

机构地区：[1]Key Laboratory of Material Chemistry for Energy Conversion and Storage(Huazhong University of Science and Technology),Ministry of Education,Hubei Key Laboratory of Material Chemistry and Service Failure,School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;[2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;[3]School of Physics and Electronics,Hunan University,Changsha 410082,Hunan,China;[4]Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou University,Zhengzhou 450002,Henan,China

出　　处：《Journal of Energy Chemistry》索引2021年第30卷第10期,共9页

基　　金：financially supported by the National Natural Science Foundation(91963109);the Fundamental Research Funds for the Central Universities(2019kfyRCPY100);supported by the Analytical and Testing Center of Huazhong University of Science&Technology。 摘　　要：Precisely controlling the crystalline phase structure and exposed facets at the atomic level opens up a new avenue for efficient catalyst design.Along this line,we report an unconventional face-centered cubic(fcc)Ru with twinned structure and stacking-fault defects as a competent electrocatalyst towards alkaline hydrogen oxidation reaction(HOR),which is now a major obstacle for the commercialization of anion exchange membrane fuel cells(AEMFC).With conventional hexagonal close packing(hcp)Ru as the counterpart,a novel scope from the phase-engineering is introduced to identify the activity origin and provide fundamental understanding of the sluggish HOR kinetics in alkaline medium.Systematic electrochemical analysis assisted by deconvoluting the hydrogen(H)desorption peaks indicates the superior performance of fcc Ru origins from the structure defects and higher proportion of the most active sites.DFT calculations,together with CO-stripping voltammograns further corroborate the stronger hydroxyl species(OH^(*))affinity lead to the higher activity on these sites.Meanwhile,it also demonstrates the H^(*)adsorption/desorption on polycrystalline Ru among the conventional'hydrogen region'is accompanied by the surface bound OH^(*)in alkaline medium,which is of great significance for subsequent alkaline HOR exploration and catalyst design. 关键词：Anion exchange membrane fuel cells Hydrogen oxidation reaction Phase-engineering Fcc Ru Surface bound OH^(*)

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Boosting alkaline hydrogen electrooxidation on an unconventional fcc-Ru polycrystal

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