文献类型：期刊文献

英文题名：The transient covering of iridium species with ultrathin carbon shells via Joule-heating for robust acidic water oxidation

作者：Guan, Zeyu[1];Li, Jiankun[1];Li, Shiyi[1];Wang, Keyu[1];Lei, Linfeng[1];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：3

起止页码：824

外文期刊名：MATERIALS CHEMISTRY FRONTIERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001115068600001)】；

基金：The research funding was provided by the National Key R&D Program of China (grant no. 2021YFB3801301) and National Natural Science Foundation of China (grant no. 22075076 and 22005098). Additional support was provided by Feringa Nobel Prize Scientist Joint Research Center, instrument ThermoFisher Talos F200X (FETEM, 200 kV).

语种：英文

摘要：Designing efficient and stable oxygen evolution reaction (OER) catalysts to boost the performance of proton exchange membrane water electrolyzers is of paramount significance for the development of green hydrogen. The establishment of a core-shell structure is a representative approach to promote the high efficiency and stability of active sites. This work presents a novel method for synthesizing catalysts by utilizing a reliable, low-cost, ultrafast Joule-heating method to construct carbon shells that evenly anchor and encapsulate iridium nanoparticles to carbon paper. The whole process of iridium-particle generation and carbon-shell evolution is successfully demonstrated, and a rapid high heat input and precise energy control are proven to be essential conditions for transient carbon coating engineering, which is further confirmed by systematically comparing the as-obtained samples with those prepared by conventional argon plasma bombardment and tube-furnace thermal treatment. When assembled in an electrolyzer, the CIr-RJH-30||Pt/C electrolyzer could stably operate at a constant current density of 100 mA cm(-2) for similar to 400 h, while CIr-plasma||Pt/C, CIr-thermal||Pt/C, and IrO2||Pt/C electrolyzers completely lost the capability for water electrolysis after 25.9 h, 21.1 h, and 45.5 h, respectively. These results demonstrate the effectiveness of the core-shell structure formed by the Joule-heating treatment in improving the performance of the catalyst.