Ternary alloy and metal oxides embedded in yolk–shell polyhedrons as bifunctional oxygen electrocatalyst  

作　　者：Yi Zhang Jia-Dan Lu Guang-Xun Zhang Rong-Mei Zhu Huan Pang 

机构地区：[1]Institute for Innovative Materials and Energy,School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou,225009,China

出　　处：《Rare Metals》2024年第2期478-488,共11页稀有金属（英文版）

基　　金：This study was financially supported by the Program for the National Natural Science Foundation of China(Nos.NSFC-21901221,21671170,21673203 and U1904215);the Natural Science Foundation of Jiangsu Province(No.BK20190870);Changjiang Scholars Program of the Ministry of Education(No.Q2018270);the Top Talent Project of Yangzhou University.

摘　　要：To improve the efficiency of oxygen electrolysis,exploiting bifunctional electrocatalysts with excellent activity and stability is extremely important due to the four-electron transfer dynamics of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).Herein,a series of yolk-shell hollow polyhedrons(YHPs)embedded with NiCoFe ternary alloy and metal oxides,which are named YHP-x(x=1,2,3,4),were reported.By controlled etching multi-layered zeolitic imidazolate frameworks and following pyrolytic integration,YHPs are endowed with mass transfer tunnels,accessible inner active sites,and good electrical conductivity.Due to the synergetic effect of the alloy,metal oxides and the yolk-shell structure,YHP-1 exhibits excellent ORR performance with a half-wave potential of 0.79 V and YHP-2 displays superior OER performance with a low overpotential of 257 mV at 10 mA cm−2.The strategy described in this work can be extended to a number of hollow/yolk-shell electrocatalysts for water splitting and metal–air batteries.

关 键 词：Metal oxides and alloy Oxygen evolution Oxygen reduction Yolk-shell polyhedron 

分 类 号：TQ426[化学工程]