Promotion of the oxygen evolution performance of Ni-Fe layered hydroxides via the introduction of a proton-transfer mediator anion

• 作者: Wenlong Li Fusheng Li Yilong Zhao Chang Liu Yingzheng Li Hao Yang Ke Fan Peili Zhang Yu Shan Licheng Sun
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 382-390
• 页数: 9页
• 语种: 英文

摘要

Developing efficient catalysts with high durability and activity for the oxygen evolution reaction(OER)is imperative for sustainable energy conversion technologies,including hydrogen generation and CO2 reduction,as well as other electrochemical energy storage systems.To this end,a comprehensive understanding of the mechanism for the water oxidation reaction is vital.Herein,a surfactant,nonafluoro-1-butanesulfonate(FBS),was introduced into Ni-Fe layered double hydroxide(NiFe-FBS/CFP)via electrochemical deposition on the surface of a carbon fiber paper(CFP)substrate.The as-prepared NiFe-FBS/CFP electrode exhibited excellent catalytic activities for OER compared to the Ni-Fe layered double hydroxide based electrode(NiFe-LDH/CFP),an excellent stability of 15 h,and an ultralow Tafel slope of 25.8 mV dec-1.Furthermore,by combining the results of pH-dependent kinetics investigations,chemical probing,proton inventory studies,and isotopic and atom-proton-transfer measurements,it was observed that a proton-transfer process controls the reaction rates of both the NiFe-LDH and NiFe-FBS catalysts,and the residual sulfonate groups serve as proton transfer mediator to accelerate the proton transfer rate.