Citation: Zihou Zhang, Haozhe Xu, Yuxiang Wang, Pin Fang, Olga Demidenko, Yujing Li. Dynamically stabilized PtCuNi/C catalyst enabled by oxygen vacancies in WO_3-x[J]. Chinese Chemical Letters, ;2026, 37(5): 110889. doi: 10.1016/j.cclet.2025.110889 shu

Dynamically stabilized PtCuNi/C catalyst enabled by oxygen vacancies in WO_3-x

Zihou Zhang ^{a, 1} ,
Haozhe Xu ^{a, 1} ,
Yuxiang Wang ^a ,
Pin Fang ^a ,
Olga Demidenko ^b ,
Yujing Li ^{a, *,}

a.
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
b.
Scientific-Practical Materials Research Centre, National Academy of Sciences of Belarus, Minsk 220072, Belarus

yjli@bit.edu.cn

Received Date: 11 December 2024
Revised Date: 11 January 2025
Accepted Date: 19 January 2025
Available Online: 20 January 2025

Figures(6)

The replacement of Pt/C catalysts with Pt-based alloy catalysts was considered a promising strategy to reduce platinum-group-metal (PGM) content in proton exchange membrane fuel cell. However, inexpensive transition metal atoms in Pt-based alloy catalysts are subject to metal dissolution issues, leading to stability issues of oxygen reduction reaction (ORR) catalysts. In this work, a PtCuNi/C-WO_3-x catalyst is designed employing non-stoichiometric WO_3-x with abundant oxygen vacancies (O_vac). The WO_3-x can dramatically improve the stability of PtCuNi without sacrificing the activity. Theoretical calculation suggests a decreased vacancy formation energy of W in WO_3-x at the presence of O_vac, as well as increased vacancy formation energies of Pt/Cu/Ni in PtCuNi alloy particles with the existence of surface W dopant. Combined with the experimental discovery of slower dissolution rates of metals in PtCuNi/C-WO_3-x catalyst, a dissolution-induced stability enhancement mechanism is proposed, whereby facilitated dissolution of W atoms from WO_3-x bulk could re-deposit on Pt-alloy surface and inhibit the dissolution of catalytically active metal atoms, revealing a dynamic process that enhances the stability. The PtCuNi/C-WO_3-x also shows great potential to be used as cathode catalyst in membrane electrode assembly for high-temperature proton exchange membrane fuel cells.
- Tungsten oxide,
- Oxygen vacancies,
- PGM alloy,
- Stability,
- Oxygen reduction
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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

Dynamically stabilized PtCuNi/C catalyst enabled by oxygen vacancies in WO3-x

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通讯作者: 陈斌, bchen63@163.com

Dynamically stabilized PtCuNi/C catalyst enabled by oxygen vacancies in WO_3-x