Encapsulating Dual-Phased Mo2c-Wc Nanocrystals Into Ultrathin Carbon Nanosheet Assemblies For Efficient Electrocatalytic Hydrogen Evolution
CHEMICAL ENGINEERING JOURNAL(2021)
摘要
Mo2C and WC are widely considered as promising electrocatalysts for hydrogen evolution reaction (HER) owing to their Pt-like electronic features. Herein, dual-phased Mo2C-WC nanocrystals, densely and uniformly confined in ultrathin carbon nanosheet assemblies (abbreviated as Mo2C-WC/NCAs), which are possible candidates for high-performance HER electrocatalysts, are fabricated through the in-situ pyrolysis of polymers containing Mo and W. When evaluated as HER electrocatalysts, Mo2C-WC/NCAs requires a small overpotential of similar to 126 mV to drive a current density of 10 mA cm(-2), and low Tafel slopes of 72 mV dec(-1) and 59 mV dec(-1) in acidic and alkaline media, respectively. In addition, the Mo2C-WC/NCAs exhibit robust catalytic stability up to 36 h. The introduction of dual-phased carbide heterostructures can modify the electronic structure and simultaneously facilitate the charge transfer of the catalysts, consistent with the density functional theory (DFT) calculations. This work highlights the in-situ construction of multi-phased hetero-metal carbide heterostructures for high-performance electrocatalysis.
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关键词
Dual-phased heterostructures, Ultrathin nanosheets, Mo2C-WC, Hydrogen evolution reaction, Hierarchical structures
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