【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) pr
【机 构】
：
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences
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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 (MoC x @SWNTs) exhibits a lower onset over-potential and a smaller Tafel slope than the one with MoC x NPs attached on the exterior surface (MoC x /SWNTs). This is likely at-tributed 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 MoC x @SWNTs compared with MoC x /SWNTs. In addition, the elec-tronic 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.
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