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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

Open access
Wang, Yuannan, Zhang, Mingcheng, Kang, Zhenye, Shi, Lei, Shen, Yucheng, Tian, Boyuan, Zou, Yongcun, Chen, Hui, Zou, Xiaoxin·2023·Nature Communications

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, TaB 2 in particular, are investigated as the support of IrO 2 nanocatalysts, which finally forms a TaO x/IrO 2 heterojunction catalytic layer on TaB 2 surface. Multiple advantageous properties are achieved simultaneously by the resulting composite material (denoted as IrO 2@TaB 2), including high electrical conductivity, improved iridium mass activity and enhanced corrosion resistance. As a consequence, the IrO 2@TaB 2 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 o C) 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.

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Metadata

Authors
Wang, Y., Zhang, M., Kang, Z., Shi, L., Shen, Y., Tian, B., Zou, Y., Chen, H., & Zou, X.
Venue
Nature Communications
Published
2023-08-23
Volume
14
Issue
1
Pages
5119-5119
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4386085512
Cited by
280
References
62
FWCI
13.11
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Nano-metal diborides-supported anode catalyst with strongly coupled TaOx/IrO2 catalytic layer for low-iridium-loading proton exchange membrane electrolyzer. https://app.cochat.ai/papers/10.1038/s41467-023-40912-8
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Wang, Y., Zhang, M., Kang, Z., Shi, L., Shen, Y., Tian, B., Zou, Y., Chen, H., & Zou, X. (2023). Nano-metal diborides-supported anode catalyst with strongly coupled TaOx/IrO2 catalytic layer for low-iridium-loading proton exchange membrane electrolyzer. Nature Communications. https://doi.org/10.1038/s41467-023-40912-8

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