High-valence Co deposition based on selfcatalysis of lattice Mn doping for robust acid water oxidation  

作　　者：Ning Yu Fu-Li Wang Xin-Yin Jiang Jin-Long Tan Mirabbos Hojamberdiev Han Hu Yong-Ming Chai Bin Dong 

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,Shandong,China [2]Institut für Chemie,Technische Universität Berlin,Straße des 17.Juni 135,10623 Berlin,Germany

出　　处：《Journal of Energy Chemistry》2025年第3期208-217,共10页能源化学(英文版)

基　　金：financially supported by the Shandong Provincial Natural Science Foundation(ZR2023LFG005);the National Natural Science Foundation of China(Nos.22479161,52274308 and U22B20144);the Fundamental Research Funds for the Central Universities(No.24CX03012A)。

摘　　要：Non-precious metal cobalt-based oxide inevitably dissolves for acid oxygen evolution reaction(OER).Designing an efficient deposition channel for leaching cobalt species is a promising approach.The dissolution-deposition equilibrium of Co is achieved by doping Mn in the lattice of LaCo_(1-x)Mn_(x)O_(3),prolonging the lifespan in acidic conditions by 14 times.The lattice doping of Mn produces a strain that enhances the adsorption capacity of OH^(-).The self-catalysis of Mn causes the leaching Co to be deposited in the form of CoO_(2),which ensures that the long-term stability of LaCo_(1-x)Mn_(x)O_(3)is 70 h instead of 5 h for LaCoO_(3).Mn doping enhances the deprotonation of^(*)OOH→O_(2)in acidic environments.Notably,the over-potential of optimized LaCo_(1-x)Mn_(x)O_(3)is 345 mV at 10 mA cm^(-2)for acidic OER.This work presents a promising method for developing noble metal-free catalysts that enhance the acidic OER activity and stability.

关 键 词：LaCoO_(3) Mn doping Acidic environment Dissolution-deposition equilibrium 

分 类 号：O643.36[理学—物理化学]