Abstract
Hydrogen produced by electrochemical water splitting depends on the development of highly efficient electrocatalysts. In this study, we report the design and synthesis of a robust hydrogen evolution reaction (HER) electrocatalyst Mo2C-Ru@CNBs, which is consisted of heterostructured Mo2C-Ru nanoparticles that dispersed on three-dimensional interconnected carbon nanobelts (CNBs). Benefiting from the high intrinsic catalytic activity of Mo2C-Ru heterostructure, abundant catalytic active sites and facilitated mass transfer, the Mo2C-Ru@CNBs catalyst shows high HER catalytic activity with ultralow overpotentials of 17 and 18 mV at 10 mA cm−2 in acidic and alkaline media, respectively, which are superior to the individual components of Mo2C@CNBs and Ru@CNBs catalysts, commercial 20% Pt/C and the recently reported Mo- and Ru-based electrocatalysts. Density functional theory calculations reveal the extensive electronic interaction between Mo2C and Ru at the heterointerfaces, leading to well-modulated electronic structure for optimized intrinsic catalytic activity and enhanced electrical conductivity.
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