Double active sites promoting hydrogen evolution activity and stability of CoRuOH/Co_(2)P by rapid hydrolysis  

作　　者：Bin Dong Ning Yu Qiu-Yue Wang Jing-Ke Ren Xin-Yu Zhang Zhi-Jie Zhang Ruo-Yao Fan Da-Peng Liu Yong-Ming Chai 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,College of Chemistry and Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China

出　　处：《Chinese Chemical Letters》2024年第7期206-211,共6页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52174283 and 52274308)。

摘　　要：Cobalt-based phosphides show excellent hydrogen evolution reaction(HER)performance,however,improving the intrinsic activity and stability of it in alkaline electrolyte still remains a challenge.Herein,CoRuOH/Co_(2)P/CF with heterojunction structure was developed by means of molten salt and rapid hydrolysis(30 s).The OH-from rapid surface hydrolysis of Co_(2)P as a hydrogen adsorption site can facilitate the formation of thin CoRuOH layer as a water dissociation site,which may bring out better synergistic effect for alkaline HER.Moreover,the covering of CoRuOH can improve the stability of Co_(2)P for HER.When drives at 100 mA/cm^(2),it only requires overpotential of 81 mV in 1.0 mol/L KOH(25℃).Even at higher current density(1000 mA/cm^(2)),CoRuOH/Co_(2)P/CF can also operate stability for at least 100 h.When coupling with NiFe-LDH/IF in a two-electrode system,the voltage of NiFe-LDH/IF(+)||CoRuOH/Co_(2)P/CF(-)at 1000 mA/cm^(2)is merely 1.77 V with 100 h,demonstrating great potential for water splitting.The implementation of this work provides a new strategy and reference for the further improvement of transition metal phosphides as HER electrocatalysts.

关 键 词：CoRuOH/Co_(2)P/CF Enhanced activity and stability Double active site Large current density Hydrogen evolution reaction 

分 类 号：TQ116.2[化学工程—无机化工] TQ426