Citation: Lingchang Kong, Xiaoya Cui, Yujing Li, Kaiwen Yang, Hengxing Peng, Libing Liao, Guocheng Lv. Ultrafast synthesis of vacancy-rich IrO₂/TiO₂ for acidic oxygen evolution reaction[J]. Chinese Chemical Letters, ;2026, 37(7): 112375. doi: 10.1016/j.cclet.2026.112375 shu

Ultrafast synthesis of vacancy-rich IrO₂/TiO₂ for acidic oxygen evolution reaction

Lingchang Kong ^a ,
Xiaoya Cui ^{a, *,} ,
Yujing Li ^{b, *,} ,
Kaiwen Yang ^c ,
Hengxing Peng ^a ,
Libing Liao ^a ,
Guocheng Lv ^{a, *,}

a.
Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low-carbon Utilization and New Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China
b.
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
c.
Institute of Molecular Plus, Department of Chemistry, Tianjin University, Tianjin 300072, China

xiaoyacui@cugb.edu.cn

yjli@bit.edu.cn

guochenglv@cugb.edu.cn

Received Date: 19 December 2025
Revised Date: 6 January 2026
Accepted Date: 8 January 2026
Available Online: 8 January 2026

Figures(5)

Supported catalysts are an effective approach in proton exchange membrane water electrolysis (PEMWE) owing to their enhanced metal-support interfacial interaction. We propose a novel high-temperature shock (HTS) technique by Joule-heating to construct an electronic coupling interface between IrO₂ nanoclusters catalysts and TiO₂ support (IrO₂/TiO₂-HTS). The HTS strategy features an ultrafast heating rate and compresses the synthesis time from hours to seconds (2 h to 60 s). The as-prepared catalyst features uniformly embedding the ultrafine IrO₂ nanoclusters enrich oxygen vacancies within the redox-active metal oxide matrix, yielding exceptional mass activity and ultrastable performance. The mass activity of the catalyst is 1081 A/g_Ir at 1.6 V vs. RHE, 13 times higher than of commercial IrO₂, and it demonstrates operation time for over 1100 h at 10 mA/cm² with a voltage decay rate of only 40 μV/h. This HTS strategy offers a scalable route to accelerate vacancy engineering and strong metal oxide-support interaction (SMOSI) formation, enabling high activity at reduced Ir loading and long-term stability under acidic conditions. The approach is general and can be extended to other supported binary oxides, opening opportunities for the development of additional high–performance OER catalysts and PEM–relevant electrolysis systems.
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Ultrafast synthesis of vacancy-rich IrO2/TiO2 for acidic oxygen evolution reaction

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通讯作者: 陈斌, bchen63@163.com

Ultrafast synthesis of vacancy-rich IrO₂/TiO₂ for acidic oxygen evolution reaction