摘要
Development of earth-abundant electrocatalysts, particularly for high-efficiency hydrogen evolution reaction （HER） under benign conditions, is highly desired, but still remains a serious challenge. Herein, we report a high-performance amorphous CoMoS4 nanosheet array on carbon cloth （CoMoS4 NS/CC）, prepared by hydrothermal treatment of a Co（OH）F nanosheet array on a carbon cloth （Co（OH）F NS/CC） in （NH4）2MoS4 solution. As a three-dimensional HER electrode, CoMoS4 NS/CC exhibits remarkable activity in 1.0 M phosphate buffer saline （pH 7）, only requiring an overpotential of 183 mV to drive a geometrical current density of 10 mA·cm-2. This overpotential is 140 mV lower than that for Co（OH）F NS/CC. Notably, this electrode also shows outstanding electrochemical durability and nearly 100% Faradaic efficiency. Density functional theory calculations suggest that CoMoS4 has a more favorable hydrogen adsorption free energy than Co（OH）F.
Development of earth-abundant electrocatalysts, particularly for high-efficiency hydrogen evolution reaction （HER） under benign conditions, is highly desired, but still remains a serious challenge. Herein, we report a high-performance amorphous CoMoS4 nanosheet array on carbon cloth （CoMoS4 NS/CC）, prepared by hydrothermal treatment of a Co（OH）F nanosheet array on a carbon cloth （Co（OH）F NS/CC） in （NH4）2MoS4 solution. As a three-dimensional HER electrode, CoMoS4 NS/CC exhibits remarkable activity in 1.0 M phosphate buffer saline （pH 7）, only requiring an overpotential of 183 mV to drive a geometrical current density of 10 mA·cm-2. This overpotential is 140 mV lower than that for Co（OH）F NS/CC. Notably, this electrode also shows outstanding electrochemical durability and nearly 100% Faradaic efficiency. Density functional theory calculations suggest that CoMoS4 has a more favorable hydrogen adsorption free energy than Co（OH）F.
基金
This work was supported by the National Key Sdentific Instrument and Equipment Development Project of China （No. 21627809）, the National Natural Science Foundation of China （Nos. 21375047, 21377046, 21405059, 21575137, 21575050, and 21601064）, Natural Science Foundation of Shandong Province （Nos. ZR2016JL013 and ZR2016BQ10）, Graduate Innovation Foundation of University of Jinan （No. YCXB15004）, and the Special Foundation for Taishan Scholar Professorship of Shandong Province （No. ts20130937）.
