Intermetallic IrGa-IrO_(x) core-shell electrocatalysts for oxygen evolution Hide Author's Information  

作　　者：Lin-Wei Chen Fuxiang He Ru-Yang Shao Qiang-Qiang Yan Peng Yin Wei-Jie Zeng Ming Zuo Lixin He Hai-Wei Liang 

机构地区：[1]Division of Nanomaterials&Chemistry,Hefei National Laboratory for Physical Sciences at the Microscale,Department of Chemistry,University of Science and Technology of China,Hefei 230026,China [2]School of Pharmacy,Anhui University of Chinese Medicine,Hefei 230012,China [3]Key Laboratory of Quantum Information,University of Science and Technology of China,Hefei 230026,China. [4]Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Nano Research》2022年第3期1853-1860,共8页纳米研究（英文版）

基　　金：the National Key Research and Development Program of China(No.2018YFA0702001);the National Natural Science Foundation of China(Nos.22071225 and 11774327);the Fundamental Research Funds for the Central Universities(No.WK2060190103);the Joint Funds from Hefei National Synchrotron Radiation Laboratory(No.KY2060000175);the support by“the Recruitment Program of Thousand Youth Talents”.

摘　　要：The development of high-performance Ir-based catalyst for electrocatalysis of oxygen evolution reaction(OER)in acidic media plays a critical role in realizing the commercialization of polymer electrolyte membrane-based water electrolyzer technology.Here we report a low-Ir core–shell OER electrocatalyst consisting of an intermetallic IrGa(IrGa-IMC)core and a partially oxidized Ir(IrOx)shell.In acidic electrolytes,the IrGa-IMC@IrOx core–shell catalysts exhibit a low overpotential of 272 mV at 10 mA·cm^(−2) with Ir loading of~20µg·cm^(−2) and a mass activity of 841 A·gIr^(−1) at 1.52 V,which is 3.6 times greater than that of commercial Ir/C(232 A·gIr^(−1))catalyst.We understand by the density functional theory(DFT)calculations that the enhanced OER activity of the IrGa-IMC@IrO_(x) catalysts is ascribed to the lifted degeneracy of Ir 5d electron of surface IrO_(x) sites induced by the intermetallic IrGa core,which increases the adsorption capacity of IrO_(x) layer for O and OH binding and eventually lowers the energy barrier of the OER rate-determining steps.

关 键 词：IrGa INTERMETALLICS ELECTROCATALYSTS oxygen evolution reaction core−shell 

分 类 号：O64[理学—物理化学]