Efficient electrocatalytic overall water splitting and structural evolution of cobalt iron selenide by one-step electrodeposition

• 作者: Haonan Ren Lingxiao Yu Leping Yang Zheng-Hong Huang Feiyu Kang Ruitao Lv
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 194-201
• 页数: 8页
• 语种: 英文

摘要

Developing bifunctional electrocatalysts with both high catalytic activity and high stability is crucial for efficient water splitting in alkaline media.Herein,a Fe-incorporated dual-metal selenide on nickel foam(Co0.9Fe0.1-Se/NF)is synthesized via a facile one-step electrodeposition method.As-synthesized materials could serve as self-supported bifunctional electrocatalysts with excellent catalytic activity towards oxy-gen evolution reaction(OER)and hydrogen evolution reaction(HER)in alkaline media.Experimental results show that delivering a 10 mA cm-2 water splitting current density only requires a cell voltage of 1.55 V.In addition,a very stable performance could be kept for about 36 hours,indicating their excel-lent working stability.Moreover,by means of phase analysis,we have identified that the evolution of the synthesized Co0.9Fe0.1-Se/NF experiences two entirely different processes in HER and OER,which hydrox-ide and oxyhydroxide are regarded as the real active sites,respectively.This work may pave the way to further understanding the relationships between the reactivity and stability of chalcogenide-based elec-trocatalysts and facilitating the rational design of efficient electrocatalysts for future renewable energy system applications.