Leaching‐Induced Ti Trapping Stabilizes Amorphous IrO <i> <sub>x</sub> </i> for Proton Exchange Membrane Water Electrolysis
Abstract
Abstract Transition metal nitrides are promising conductive support materials in oxygen evolution reaction (OER), whereas it is unclear if their electrochemical oxidation during prolonged test would affect the OER catalysts. Herein, we demonstrate that the leaching‐induced Ti trapping effect from TiN supports effectively stabilizes the electrochemically oxidized amorphous IrO x catalyst. Structural characterizations reveal that the TiN support experiences severe leaching during OER test, leaving minor amounts of Ti–O species trapping on IrO x clusters, which mitigate the overoxidation of Ir(III) species and elongate the Ir–O bonds. This leads to 70% reduction of lattice oxygen oxidation and the substantially reduced Ir leaching. Additionally, self‐thickening of the catalyst layers is found during proton exchange membrane water electrolysis (PEMWE), enabling an ultralow catalyst loading of 87 µg Ir cm −2 to obtain a stable operation at 1.0 A cm −2 for 500 h. This work deepens the understanding of TiN‐supported catalysts for long‐term stable OER electrocatalysis.
Article Details
Authors (14)
Hao Yang Lin
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering
Wen Jing Li
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 China
Miao Yu Lin
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Materials Science and Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 China
Hao Guan Xu
Song Ru Fang
Yao Lv
Wenbo Li
Jianwei Guo
Huai Qin Fu
School of Environment and Science, Gold Coast Campus
Hai Yang Yuan
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
Chenghua Sun
Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Sheng Dai
Peng Fei Liu
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
Hua Gui Yang
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China