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Enhanced hydrogen evolution reaction over molybdenum carbide nanoparticles confined inside single-walled carbon nanotubes

查看全文 作　　者：Tingting [1,2]Cui;Jinhu [1,2]Dong;Xiulian [1]Pan;Tie [1]Yu;Qiang [1]Fu;Xinhe [1]Bao 高影响力作者 机构地区：[1]State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences高影响力机构 出　　处：《Journal of Energy Chemistry》索引2019年第28卷第1期,共5页高影响力期刊 基　　金：financially supported by the National Natural Science Foundation of China (No. 21425312, 21688102, 21621063, and 21573224) 摘　　要：Carbon nanotubes(CNTs) have shown as unique nanoreactors to tune the catalytic activity of confined nano-catalysts. Here we report that the catalytic performance of molybdenum carbide nanoparticles(MoC_x NPs) for the hydrogen evolution reaction(HER) process can be enhanced by encapsulation within single-walled carbon nanotubes(SWNTs) with a diameter of 1–2 nm. The catalyst with MoC_x NPs located on the interior surface of SWNTs(MoCx@SWNTs) exhibits a lower onset over-potential and a smaller Tafel slope than the one with MoC_x NPs attached on the exterior surface(MoCx/SWNTs). This is likely attributed to the much smaller particle size and the more reduced states of the confined MoC_x NPs, as well as the larger specific surface area of MoCx@SWNTs compared with Mo Cx/SWNTs. In addition, the electronic structure of the confined MoC_x NPs might be modified by the confinement effects of SWNTs, and hence the adsorption free energy of H atoms on the confined MoC_x NPs, which could also contribute to their higher performance. These results suggest that the SWNTs can be further explored for constructing novel catalysts with beneficial catalytic performance. 关 键 词：SINGLE-WALLED carbon NANOTUBES CONFINED catalysis Molybdenum CARBIDE NANOPARTICLES Hydrogen evolution reaction
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