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] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Suzhou Laboratory, Suzhou, 215000, China

年份：2023

卷号：8

期号：3

起止页码：824

外文期刊名：Materials Chemistry Frontiers

收录：EI(收录号：20235015227200)

语种：英文

外文关键词：Carbon - Catalysts - Electrodes - Shells (structures) - Synthesis (chemical)

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 ～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. ? 2024 The Royal Society of Chemistry.