Ru single atoms induce surface-mediated discharge in Na-O_(2)batteries  

作　　者：Xin Jin Yangyang Li Shuo Zhang Jiangwei Zhang Zihan Shen Chenlin Zhong Ziqiang Cai Chaoquan Hu Huigang Zhang 

机构地区：[1]National Laboratory of Solid State Microstructures,Collaborative Innovation Center of Advanced Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China [2]Dalian National Laboratory for Clean Energy&State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences(CAS),Dalian 116023,China [3]State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [4]Nanjing IPE Institute of Green Manufacturing Industry,Nanjing 211100,China

出　　处：《Chinese Chemical Letters》2022年第1期491-496,共6页中国化学快报（英文版）

基　　金：the financial support of the National Natural Science Foundation of China(Nos.22075131,21776121);National Key R&D Program of China(No.2020YFA0406104)。

摘　　要：Sodium(Na)O_(2)batteries have high energy density and low cost.However,high polarization,complex discharge products,and low Coulombic efficiency(CE)lead to poor cyclability.Here,we proposed an atomically dispersed Ru catalyst on nitrogen-doped graphene for Na-O_(2)batteries.The catalysts enable the discharge to proceed via a surface-mediated route,which leads to uniform deposition of Na_(2-x)O_(2)and low polarization during recharge.The first-principle calculation revealed that Ru-N_(4)complex in the catalyst has strong chemical adsorption to intermediate superoxides,facilitating uniform deposition and enhancing rapid kinetics.In contrast,Ru nanoparticles,despite the catalytic activity,induce bulk deposition via a solution-mediated route because the exposed graphene surface shows weak interaction to superoxides,thereby lowering CEs and cyclability.In brief,the atomically-dispersed Ru catalyst endows Na-O_(2)batteries with excellent electrochemical properties via a surface-mediated discharge.

关 键 词：Na-O_(2)batteries Ru single atoms Surface-mediated mechanism Adsorption energy CO-DEPOSITION 

分 类 号：TM911.41[电气工程—电力电子与电力传动] O643.36[理学—物理化学]