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Nano-metal diborides-supported anode catalyst with strongly coupled TaOx/IrO2 catalytic layer for low-iridium-loading proton exchange membrane electrolyzer

Author

Listed:
  • Yuannan Wang

    (Jilin University)

  • Mingcheng Zhang

    (Jilin University)

  • Zhenye Kang

    (Hainan University)

  • Lei Shi

    (Jilin University)

  • Yucheng Shen

    (Jilin University)

  • Boyuan Tian

    (State Key Laboratory of Advanced Transmission Technology (State Grid Smart Grid Research Institute Company Limited))

  • Yongcun Zou

    (Jilin University)

  • Hui Chen

    (Jilin University)

  • Xiaoxin Zou

    (Jilin University)

Abstract

The sluggish kinetics of oxygen evolution reaction (OER) and high iridium loading in catalyst coated membrane (CCM) are the key challenges for practical proton exchange membrane water electrolyzer (PEMWE). Herein, we demonstrate high-surface-area nano-metal diborides as promising supports of iridium-based OER nanocatalysts for realizing efficient, low-iridium-loading PEMWE. Nano-metal diborides are prepared by a novel disulphide-to-diboride transition route, in which the entropy contribution to the Gibbs free energy by generation of gaseous sulfur-containing products plays a crucial role. The nano-metal diborides, TaB2 in particular, are investigated as the support of IrO2 nanocatalysts, which finally forms a TaOx/IrO2 heterojunction catalytic layer on TaB2 surface. Multiple advantageous properties are achieved simultaneously by the resulting composite material (denoted as IrO2@TaB2), including high electrical conductivity, improved iridium mass activity and enhanced corrosion resistance. As a consequence, the IrO2@TaB2 can be used to fabricate the membrane electrode with a low iridium loading of 0.15 mg cm−2, and to give an excellent catalytic performance (3.06 A cm−2@2.0 V@80 oC) in PEMWE―the one that is usually inaccessible by unsupported Ir-based nanocatalysts and the vast majority of existing supported Ir-based catalysts at such a low iridium loading.

Suggested Citation

  • Yuannan Wang & Mingcheng Zhang & Zhenye Kang & Lei Shi & Yucheng Shen & Boyuan Tian & Yongcun Zou & Hui Chen & Xiaoxin Zou, 2023. "Nano-metal diborides-supported anode catalyst with strongly coupled TaOx/IrO2 catalytic layer for low-iridium-loading proton exchange membrane electrolyzer," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40912-8
    DOI: 10.1038/s41467-023-40912-8
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    References listed on IDEAS

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    1. Kang, Zhenye & Yang, Gaoqiang & Mo, Jingke, 2024. "Development of an ultra-thin electrode for the oxygen evolution reaction in proton exchange membrane water electrolyzers," Renewable Energy, Elsevier, vol. 224(C).
    2. Yu Shen & Xiao-Long Zhang & Ming-Rong Qu & Jie Ma & Sheng Zhu & Yu-Lin Min & Min-Rui Gao & Shu-Hong Yu, 2024. "Cr dopant mediates hydroxyl spillover on RuO2 for high-efficiency proton exchange membrane electrolysis," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    3. Zhirong Zhang & Chuanyi Jia & Peiyu Ma & Chen Feng & Jin Yang & Junming Huang & Jiana Zheng & Ming Zuo & Mingkai Liu & Shiming Zhou & Jie Zeng, 2024. "Distance effect of single atoms on stability of cobalt oxide catalysts for acidic oxygen evolution," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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