文献类型：期刊文献

英文题名：Unveiling high intrinsic activity of Co3Mo alloy and metallic Ni embedded in CoNiMo-O nanosheets arrays for hydrogen evolution reaction

作者：Zhou, Jiao-Jiao[1,2];Ding, Hualong[1];Hua, Zile[2];Xu, Le[1,2];Wang, Weiwei[1];Wang, Linping[1];Han, Lei[3];Chen, Luyang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai 200050, Peoples R China;[3]Ningbo Univ, Sch Mat Sci & Chem Engn, Ningbo 315211, Zhejiang, Peoples R China

年份：2022

卷号：450

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20220128167);WOS:【SCI-EXPANDED(收录号:WOS:000837006200001)】；

基金：Acknowledgements This work was supported by the National Natural Science Foundation of China (51502092, 21971131) , the Fundamental Research Funds for the Central Universities (JKD01211601, 222201718002) , the Thousand Talents Program Young Project in China, and the Program for Eastern Scholar at Shanghai Institutions of Higher Learning (TP2015028) .

语种：英文

外文关键词：Hydrogen evolution reaction; Co3Mo alloy; Metallic Ni; CoNi-MOF-74

摘要：Developing robust and efficient electrocatalysts to boost hydrogen evolution reaction (HER) in alkaline solution is a crucial issue for H-2 energy. One of the effective strategies is to fabricate excellent electrocatalysts by embedding carbon shell-encapsulated transition metals or alloys in metal oxides through metal-organic frameworks (MOFs) as precursor. Herein, three multiphase composite HER catalysts (NF/CoNiMo-500, 600, 700) are exploited by using NF/CoNi-MOF-74 as template. Specially, the NF/CoNiMo-500 shows optimal HER activity, which is constructed by nesting graphitized carbon wrapped Co3Mo alloy and metallic Ni nanoparticles into amorphous CoNiMo-oxide (CoNiMo-O) nanosheets. It requires the lowest overpotential of 34 mV to reach the current density of 10 mA/cm(2), demonstrating the smallest Tafel slope of 58 mV/dec. Importantly, the water-alkali electrolyzer applying NF/CoNiMo-500 as cathode and NF/IrO2 as anode exhibits a low voltage of 1.39 V at 10 mA/cm(2) and good stability. The density functional theory (DFT) calculations reveal the high intrinsic activity of Co3Mo alloy and metallic Ni contributes significantly to the optimal electrocatalytic performance of CoNiMo-500. This work opens up a new orientation to synthesize microscale MOF-74 arrays and develop efficient HER electrocatalysts by combining carbon shell-encapsulated metals and alloys with oxides.