文献类型：期刊文献

英文题名：High-Valence-Manganese Driven Strong Anchoring of Iridium Species for Robust Acidic Water Oxidation

作者：Weng, Yuxiao[1];Wang, Keyu[1];Li, Shiyi[1];Wang, Yixing[1];Lei, Linfeng[1];Zhuang, Linzhou[1];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：10

期号：8

外文期刊名：ADVANCED SCIENCE

收录：;EI(收录号：20230413440159);WOS:【SCI-EXPANDED(收录号:WOS:000919116600001)】；

基金：Y. W. and K. W. contributed equally to this work. The authors gratefully acknowledge the research funding provided by National Key R&D Program of China (Grant No. 2021YFB3801301), and National Natural Science Foundation of China (Grant Nos. 21908054, 22075076 and 22005098), and Central Government Funds for Guiding Local Science and Technology Development (Grant No. 2021Szvup040). This work was carried out with the support of Shanghai Synchrotron Radiation Facility (SSRF), instrument BL14W1 (proposal 2022-SSRF-PT-020451).

语种：英文

外文关键词：acidic oxygen evolution reaction; anchor sites; high-valence manganese; Mn-O-Ir coordination

摘要：Designing an efficient and durable electrocatalyst for the sluggish anodic oxygen evolution reaction (OER) has been the primary goal of using proton exchange membrane electrolyzer owing to the highly acidic and oxidative environment at the anode. In this work, it is reported that high-valence manganese drives the strong anchoring of the Ir species on the manganese dioxide (MnO2) matrix via the formation of an Mn-O-Ir coordination structure through a hydrothermal-redox reaction. The iridium (Ir)-atom-array array is firmly anchored on the Mn-O-Ir coordination structure, endowing the catalyst with excellent OER activity and stability in an acidic environment. Ir-MnO2(160)-CC shows an ultralow overpotential of 181 mV at j = 10 mA cm(-2) and maintains long-term stability of 180 h in acidic media with negligible decay, superior to most reported electrocatalysts. In contrast, when reacting with low-valence MnO2, Ir species tend to aggregate into IrOx nanoparticles, leading to poor OER stability. Density functional theory (DFT) calculations further reveal that the formation of the Mn-O-Ir coordination structure can optimize the adsorption strength of *OOH intermediates, thus boosting the acidic OER activity and stability.