Power Generation Technology ›› 2023, Vol. 44 ›› Issue (3): 340-349.DOI: 10.12096/j.2096-4528.pgt.22184

• Key technologies of green hydrogen preparation, storage and multi-scenario application • Previous Articles     Next Articles

An Efficient Mn-Ir Doped Supported Catalyst for PEM Water Electrolysis

Shuhan ZHANG, Xiaofeng MA, Ruilin ZHANG, Yanqun ZHU, Yong HE, Zhihua WANG   

  1. State Key Laboratory of Clean Energy Utilization (Zhejiang University), Hangzhou 310027, Zhejiang Province, China
  • Received:2022-12-27 Published:2023-06-30 Online:2023-06-30
  • Contact: Zhihua WANG
  • Supported by:
    National Natural Science Foundation of China(52125605);Fundamental Research Funds for the Central Universities(2022ZFJH004)

Abstract:

Proton exchange membrane (PEM) water electrolysis is a green and sustainable method of hydrogen production. The development of efficient and economical electrocatalysts for anodic oxygen evolution reaction (OER) is the key to its large-scale commercialization. Iridium oxide catalysts supported by different manganese based oxide carriers (IrO x /Mn8O10Cl3, IrO x /β-MnO2 and IrO x /α-MnO2) were prepared by two-step synthesis method, and the content of iridium is about 55%. Compared with the commercial IrO2 and other noble metal containing electrocatalysts, the synthesized catalysts have lower overpotential and higher current density. The overpotential of IrO x /β-MnO2 is only 228 mV at the current density of 10 mA/cm2. The specific mass activity of IrO x /Mn8O10Cl3 reaches 916.7 A/gIr at 1.53V. The enhancement of OER activity is attributed to the abundant hydroxyl oxygen defects and IrIII species on the catalyst surface. The rich crystalline-amorphous interface provides a large number of active sites for the reaction. The iridium oxide/manganese based oxide catalysts reported in this paper provide new insights for the development of efficient and economical catalysts for acidic OER.

Key words: proton exchange membrane water electrolysis, oxygen evolution reaction, manganese based oxide carriers, iridium oxide catalysts

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