Charge redistribution caused by sulfur doping of bimetal FeCo phosphides supported on heteroatoms-doped graphene for Zn-air batteries with stable cycling  

作　　者：Jin-Tao Ren Yi-Dai Ying Yu-Ping Liu Wei Li Zhong-Yong Yuan 

机构地区：[1]National Institute for Advanced Materials,School of Materials Science and Engineering,Nankai University,Tianjin 300350,China [2]Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),College of Chemistry,Nankai University,Tianjin 300071,China

出　　处：《Journal of Energy Chemistry》2022年第8期619-630,I0017,共13页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(21875118,22179065,and 22105108);the Natural Science Foundation of Tianjin(19JCZDJC37700);the 111 project(B12015);China Postdoctoral Science Foundation(2020M680860)。

摘　　要：Exploring feasible synthesis approaches to highly efficient and robust bifunctional electrocatalysts toward both oxygen evolution reaction(OER)and oxygen reduction reaction(ORR)is triggering researcher’s even-increasing interest in rechargeable Zn-air batteries.Herein,sulfur-doped bimetal FeCo phosphide nanoparticles dispersed on N,P,S-tri-doped graphene(donated as S-FeCo3P/NPSG)are rationally prepared through a controllable one-step carbothermal-phosphorization strategy.The modified charge distribution and electron-donor properties of S-FeCo3P/NPSG caused by S decoration render a significantly beneficial effect on the electrocatalytic activities.Consequently,the S-FeCo3P/NPSG electrode exhibits extraordinary bifunctional activities toward oxygen electrochemistry of the OER overpotential of 290 m V at 10 m A cm^(-2) and the ORR half-wave potential of 0.83 V,approaching to that of noblemetal IrO_(2)(289 m V)and Pt/C(0.84 V),respectively,but with more stronger operation stability in alkaline media.When S-FeCo3P/NPSG serves as the air cathode for liquid-state Zn-air battery,the large peak power density and energy density,as well as superb discharge-charge durability(cycling life>600 h)of this device are obtained.Furthermore,all-solid-state Zn-air battery with S-FeCo3P/NPSG as air electrode also displays excellent mechanical flexibility,high power density and stable cycling stability.The self-reconstruction behavior of the S-FeCo3P/NPSG cathode catalysts is also investigated during the electrocatalytic Zn-air battery operation.This work would provide some novel inspiration from aspects of bonding and charge distribution for the rational construction of active and cost-efficient bifucntional oxygen electrocatalysts for energy storage and conversion devices.

关 键 词：Charge redistribution Metal phosphides Bifunctional electrocatalyst Oxygen electrocatalysis Zinc-air batteries 

分 类 号：O643.36[理学—物理化学] TM911.41[理学—化学]