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Structural impacts on the degradation behaviors of Ir-based electrocatalysts during water oxidation in acid.
Li, Mengxian; Qi, Jun; Zeng, Huiyan; Chen, Jiajun; Liu, Zhongfei; Gu, Long; Wang, Jianwen; Zhang, Yuying; Wang, Miaomiao; Zhang, Yan; Lu, Xiaoying; Yang, Chunzhen.
Afiliación
  • Li M; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Qi J; National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China.
  • Zeng H; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Chen J; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Liu Z; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Gu L; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Wang J; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Zhang Y; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China.
  • Wang M; Institute of Advanced Science Facilities, Shenzhen 518107, China.
  • Zhang Y; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
  • Lu X; Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, Hong Kong, China. Electronic address: xylu@thei.edu.hk.
  • Yang C; School of Materials, Sun Yat-Sen University, Shenzhen 518107, China. Electronic address: yangchzh6@mail.sysu.edu.cn.
J Colloid Interface Sci ; 674: 108-117, 2024 Nov 15.
Article en En | MEDLINE | ID: mdl-38917711
ABSTRACT
Large-scale hydrogen production by electrocatalytic water splitting still remains as a critical challenge due to the severe catalyst degradation during the oxygen evolution reaction (OER) in acidic media. In this study, we investigate the structural impacts on catalyst degradation behaviors using three iridium-based oxides, namely SrIrO3, Sr2IrO4, and Sr4IrO6 as model catalysts. These Ir oxides possess different connection configurations of [IrO6] octahedra units in their structure. Stable OER performance is observed on SrIrO3 and attributed to the edge-linked [IrO6] structure and rapid formation of a continuous IrOx layer on its surface, which functions not only as the "real" catalyst but also a shield preventing continuous cation leaching (with <1.0 at.% of Ir leaching). In comparison, both Sr2IrO4 and Sr4IrO6 catalysts demonstrate quick current fading with structure transformation to rutile IrO2 and formation of inconducive SrSO4 precipitates on surface, blocking the reactive sites. Nevertheless, over 60 at.% of Ir leaching is detected from the Sr4IrO6 catalyst due to its isolated [IrO6] structure configuration. Results of this work highlight the structural impacts on the catalyst stability in acidic OER conditions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos