文献类型：期刊文献

英文题名：Multivalence-State Tungsten Species Facilitated Iridium Loading for Robust Acidic Water Oxidation

作者：Guan, Zeyu[1];Li, Jiankun[1];Li, Shiyi[1];Wang, Keyu[1];Lei, Linfeng[1,2];Wang, Yixing[1,2];Zhuang, Linzhou[1];Xu, Zhi[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Suzhou Lab, Suzhou 215000, Peoples R China

年份：2024

卷号：8

期号：8

外文期刊名：SMALL METHODS

收录：;EI(收录号：20240615511789);WOS:【SCI-EXPANDED(收录号:WOS:001157846300001)】；

基金：Z.G. and J.L. contributed equally to this work. The authors gratefully acknowledge the research funding provided by National Key R&D Program of China (Grant No. 2021YFB3801301), National Natural Science Foundation of China (Grant Nos. 22075076 and 22378119), and Shanghai Pilot Program for Basic Research (22TQ1400100-4). The authors thank Shanghai Synchrotron Radiation Facility for XAS equipment access. Additional support was provided by Feringa Nobel Prize Scientist Joint Research Center, instrument: ThermoFisher Talos F200X (FETEM, 200 kV) and ThermoFisher Titan Themis G2 60-300.

语种：英文

外文关键词：iridium loading; oxygen evolution reaction; polyvalent tungsten; rapid joule-heating; vacancy engineering

摘要：The development of the proton exchange membrane water electrolyzer (PEMWE) is still limited by the prohibitive cost and scarcity of iridium (Ir)-based oxygen evolution reaction (OER) catalyst. This work presents a novel catalyst synthesized by precursor-atomization and rapid joule-heating method, successfully doping iridium atoms into polyvalent tungsten blends (W-0, W5+, W6+) based on titanium substrate. The vacancy engineering of unsaturated tungsten oxide (W5+, W6+) reconstructs the electronic structure of the catalyst surface, which resulting in the low-valence state iridium species, avoiding excessive oxidation of iridium and accelerating the catalytic kinetics. Meanwhile, metallic tungsten (W-0) improves the conductivity of catalyst and guarantees the stable existence of oxygen vacancy. The TiIrWOx possesses excellent performance in acidic OER catalysis, requiring overpotential of only 181 mV to drive 10.0 mA cm(-2), and exhibiting a high mass activity of 753 A g(Ir)(-1) at an overpotential of 300 mV. The membrane electrode assembly (MEA) with TiIrWOx as anode electrocatalyst can reduce the Ir consumption amount by >60% compared to commercial IrO2, and it can operated over 120 h at a current density of 1.0 A cm(-2).