首页|Surface engineering on MnO2 nanorods by La single atoms to accelerate oxygen reduction kinetics
Surface engineering on MnO2 nanorods by La single atoms to accelerate oxygen reduction kinetics
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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 MnO2 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 α-MnO2 nanor-ods.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 cur-rent 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 MnO2,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.
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