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In-situ optimizing the valence configuration of vanadium sites in NiV-LDH nanosheet arrays for enhanced hydrogen evolution reaction

查看全文 作　　者：Danyang [1]He;Liyun [1]Cao;Jianfeng [1]Huang;Koji [2]Kajiyoshi;Jianpeng [1]Wu;Changcong [3]Wang;Qianqian [1]Liu;Dan [1]Yang;Liangliang [1,2]Feng 高影响力作者 机构地区：[1]School of Materials Science&Engineering,Xi'an Key Laboratory of Green Processing for Ceramic Materials,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Shaanxi University of Science and Technology,Xi'an 710021,Shaanxi,China;[2]Research Laboratory of Hydrothermal Chemistry,Faculty of Science and Technology,Kochi University,Kochi 780-8520,Japan;[3]State Key Laboratory of Solidification Processing,Carbon/carbon Composites Research Center,Northwestern Polytechnical University,Xi'an 710072,Shaanxi,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2020年第29卷第8期,共10页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos.21701107, 51672165);Natural Science Foundation of Shaanxi Province (2019JQ-018);Doctoral Scientific Research Startup Foundation of Shaanxi University of Science and Technology (2016QNBT-07);Platform construction Fund for Imported talent of Shaanxi University of Science and Technology (134080038);National Key R&D Program of China (2017YFB0308300);Xi’an Key Laboratory of Green Manufacture of Ceramic materials Foundation (2019220214SYS017CG039)。 摘　　要：Developing the highly active, cost-effective, environmental-friendly, and ultra-stable nonprecious electrocatalysts for hydrogen evolution reaction(HER) is distinctly indispensable for the large-scale practical applications of hydrolytic hydrogen production. Herein, we report the synthesis of well-integrated electrode, NiV layered double hydroxide nanosheet array grown in-situ on porous nickel foam(abbreviated as in-NiV-LDH/NF) via the facile one-step hydrothermal route. Interestingly, the valence configuration of vanadium(V) sites in such NiV-LDH are well dominated by the innovative use of NF as the reducing regulator, achieving the reassembled in-NiV-LDH/NF with a high proportion of trivalent V ions(V3+), and then an enhanced intrinsic electrocatalytic HER activity. The HER testing results show that the in-NiVLDH/NF drives the current densities of 10 and 100 mA cm-2 at extremely low overpotentials of 114 and 245 mV without iR-compensation respectively, even outperforms commercial 20 wt% Pt/C at the large current density of over 80 mA cm-2 in alkaline media, as well as gives robust catalytic durability of at least 100 h in both alkaline and neutral media. More importantly, this work provides a fresh perspective for designing bimetal(oxy) hydroxides electrocatalysts with efficient hydrogen generation. 关 键 词：NiV-LDH V sites Valence configuration Stability Hydrogen evolution reaction
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