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In-situ transformation of Co(OH)_(2) into NH_(4)CoPO_(4)·H_(2)O on Co foil: 3D self-supported electrocatalyst with asymmetric local atomic and electronic structure for enhanced oxygen evolution reaction

查看全文 作　　者：Quande [1]Che;Xiaobin [2]Xie;Qian [1]Ma;Junpeng [1]Wang;Yuanna [1]Zhu;Ruixia [1]Shi;Ping [1]Yang 高影响力作者 机构地区：[1]School of Materials Science and Engineering,University of Jinan,Jinan 250022,Shandong,China;[2]School of Materials Science and Engineering.Wuhan University of Technology,Wuhan 430070,Hubei,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2020年第29卷第12期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (51602128);the Research Foundation from University of Jinan (XKY1401, XBS1508, XBH1504)。 摘　　要：Development of high efficient and stable water oxidation catalysts is essential for the realization of industrial water-splitting systems. Herein, a novel approach involving an in-situ transformation of Co(OH)2 nanosheets into NH4 CoPO4·H2 O nanoplates on Co foil is reported. As a 3 D self-supported oxygen revolution reaction(OER) electrocatalyst, the as-prepared NH4 CoPO4·H2 O/Co exhibits remarkable catalytic activity and exceptional stability. Specifically, it can deliver a current density of 10 m A cm^(-2) at a quite low overpotential of 254 m V with a small Tafel slope of 64.4 m V dec-1 in alkaline electrolyte. Through experimental study and theoretical analysis, the excellent OER performance can be attributed to enriched exposed active sites, favorable electron/proton transfer and mass transport, and its unique asymmetric local atomic and electronic structure. Thus, this present research not only provides a practicable in-situ transformation strategy to design 3 D self-supported electrocatalysts, but also enlightens a new way of developing transition-metal phosphates for efficient and stable water oxidation at atomic level. 关 键 词：Electrocatalysis Oxygen evolution reaction Transition-metal phosphate NH_(4)CoPO_(4)·H_(2)O
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