【摘 要】
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It has been of interest in seeking electrocatalysts that could exercise equally high-efficient and durable hydrogen evolution upon nonselective electrolytes in both acidic and alkaline environments.Herein,we report a facile strategy to fabricate cobalt tu
【机 构】
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Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing
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It has been of interest in seeking electrocatalysts that could exercise equally high-efficient and durable hydrogen evolution upon nonselective electrolytes in both acidic and alkaline environments.Herein,we report a facile strategy to fabricate cobalt tungsten phosphides (CoxW2-xP2/C) hollow polyhedrons with tunable composition based on metal-organic frameworks (MOFs) template method.By the deliberate control of W doping,the synthesized catalyst with the composition of Co0.9W1.1P2/C is found to be able to achieve a current density of 10 mA·cm-2 at overpotentials of 35 and 54 mV in acidic and alkaline media,respectively.This combined electrochemical property stands atop the state-of-the-art electrocatalyst counterparts.To unveil the peculiar behavior of the structure,density functional theory (DFT) calculation was implemented and reveals that the surface W-doping facilitates the optimization of hydrogen absorption free energy (ΔGH·) as well as the thermodynamic and kinetics barriers for water dissociation,which is coupled with the hollow structure of Co-W phosphides,leading to the prominent HER catalytic performance.
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