Surface engineering on MnO_(2)nanorods by La single atoms to accelerate oxygen reduction kinetics  

作　　者：Zhang-Long He Liu-Qi Wang Min Jiang Jia-Nan Xie Shan Liu Jin-Can Ren Rui Sun Wen-Bin Lv Wei-Bin Guo Yu-Ling Liu Bing Li Qi Liu Hao He 

机构地区：[1]School of Materials Science and Engineering,Changsha University of Science and Technology,Changsha 410000,China [2]School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [3]School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [4]Department of Physics,City University of Hong Kong,Hong Kong 999077,China

出　　处：《Rare Metals》2024年第9期4302-4311,共10页稀有金属（英文版）

基　　金：financially supported by the Scientific Research Fund of Hunan Provincial Education Department(No.21B0289);Changsha Municipal Science and Technology Projects(No.2022cskj006)。

摘　　要：Surface engineering,which modulates the electronic structure and adsorption/desorption properties of electrocatalysts,is one of the key strategies for improving the catalytic performance.Herein,we demonstrate a facile solid-phase reaction for surface engineering of MnO_(2)to boost the oxygen reduction kinetics.Via reaction with surface hydroxy groups,La single atoms with loading amount up to 2.7 wt%are anchored onto a-MnO_(2)nanorods.After surface engineering,the oxygen reduction reaction(ORR)kinetics is significantly improved with the half-wave potential from 0.70 to 0.84 V,the number of transferred electrons from 2.5 to 3.9 and the limiting current density from 4.8 to 6.0 mA·cm^(-2).In addition,the catalyst delivers superior discharge performance in both alkaline and neutral metal–air batteries.Density functional theory(DFT)calculations reveal that atomic La modulates the surface electronic configuration of MnO_(2),reduces its d-band center and thus lowers the OOH*and O*reaction energy barrier.This work provides a new route for rational design of highly active electrocatalyst and holds great potential for application in various catalytic reactions.

关 键 词：Surface engineering Single atoms Electron injection Oxygen reduction reaction Metal-air batteries 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]