Abstract
Cobalt-based phosphides show excellent hydrogen evolution reaction(HER)performance,however,im-proving the intrinsic activity and stability of it in alkaline electrolyte still remains a challenge.Herein,CoRuOH/Co2P/CF with heterojunction structure was developed by means of molten salt and rapid hydrol-ysis(30 s).The OH- from rapid surface hydrolysis of Co2P as a hydrogen adsorption site can facilitate the formation of thin CoRuOH layer as a water dissociation site,which may bring out better synergistic ef-fect for alkaline HER.Moreover,the covering of CoRuOH can improve the stability of Co2P for HER.When drives at 100 mA/cm2,it only requires overpotential of 81 mV in 1.0 mol/L KOH(25 ℃).Even at higher current density(1000 mA/cm2),CoRuOH/Co2P/CF can also operate stability for at least 100 h.When cou-pling with NiFe-LDH/IF in a two-electrode system,the voltage of NiFe-LDH/IF(+)||CoRuOH/Co2P/CF(-)at 1000 mA/cm2 is merely 1.77 V with 100 h,demonstrating great potential for water splitting.The imple-mentation of this work provides a new strategy and reference for the further improvement of transition metal phosphides as HER electrocatalysts.
基金项目
National Natural science Foundation of China(52174283)
National Natural science Foundation of China(52274308)
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