文献类型：期刊文献

英文题名：Core-Shell Nanostructured Ru@Ir-O Electrocatalysts for Superb Oxygen Evolution in Acid

作者：Zhang, Jiahao[1];Fu, Xianbiao[1];Xia, Fanjie[2];Zhang, Wenqing[3];Ma, Dongsheng[1];Zhou, Yu[1];Peng, Hong[1];Wu, Jinsong[2];Gong, Xueqing[4,5];Wang, Dong[4,5];Yue, Qin[1]

机构：[1]Univ Elect Sci & Technol China, Inst Fundamental & Frontier Sci, Chengdu 610054, Peoples R China;[2]Wuhan Univ Technol, Nanostruct Res Ctr, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China;[3]Rice Univ, Dept Chem & Biomol Engn, Houston, TX 77005 USA;[4]East China Univ Sci & Technol, Ctr Computat Chem, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：18

期号：15

外文期刊名：SMALL

收录：;EI(收录号：20221111774467);WOS:【SCI-EXPANDED(收录号:WOS:000766008700001)】；

基金：J.Z. and X.F. contributed equally to this work. The authors acknowledge the financial support from the National Key Research and Development Program of China (2018YFA0208602), the National Natural Science Foundation of China (21903025, 21825301), Sichuan Science and Technology Program (no. 2020YJ0243), and Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (Grant No. 2022-K28).

语种：英文

外文关键词：water electrolysis; oxygen evolution reaction; iridium; core-shell structures; tensile strain

摘要：The design of highly active and durable catalysts for the sluggish anodic oxygen evolution reaction (OER) in acid remains an urgent yet challenging goal in water electrolysis. Herein, a core-shell nanostructured Ru@Ir-O catalyst with tensile strains and incorporated oxygens is introduced in the Ir shell that holds an extremely low OER overpotential of 238 mV at 10 mA cm(-2) in acid. The material also shows a remarkable 78-fold higher mass activity than the conventional IrO2 at 1.55 V in 0.5 M H2SO4. Structural characterization and theoretical calculations reveal that the core-shell interaction and tensile strain cause band position shift and charge redistribution. These electronic factors furthermore optimize the bonding strength of O* and HOO* intermediates on the surface, yielding significantly boosted OER activity relative to the conventional IrO2.