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Research Article

PtCu subnanoclusters epitaxial on octahedral PtCu/Pt skin matrix as ultrahigh stable cathode electrocatalysts for room-temperature hydrogen fuel cells

Fengling Zhao1Lirong Zheng2Qiang Yuan1( )Qinghua Zhang5Tian Sheng4( )Xiaotong Yang1Lin Gu5Xun Wang3( )
State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
Beijing Synchrotron Radiation Facility Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Key Lab of Organic Optoelectronics & Molecular Engineering, Tsinghua University, Beijing 100084, China
College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China
Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100190, China
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Graphical Abstract

Cu-rich PtCu subnanoclusters epitaxial on octahedral PtCu/Pt Skin (PtCu1.60) nanocrystals have been achieved by a seed-mediated strategy. The PtCu1.60/C exhibits 140,000 cycles durability for oxygen reduction reaction (ORR) and delivers enhanced power density and 100 h durability without current density decay in a practical room-temperature polymer electrolyte membrane fuel cell (PEMFC).

Abstract

Achieving stable surface structures of metal catalysts is an extreme challenge for obtaining long-term durability and meeting industrial application requirements. We report a new class of metal catalyst, Pt-rich PtCu heteroatom subnanoclusters epitaxially grown on an octahedral PtCu alloy/Pt skin matrix (PtCu1.60), for the oxygen reduction reaction (ORR) in an acid electrolyte. The PtCu1.60/C exhibits an 8.9-fold enhanced mass activity (1.42 A·mgPt−1) over that of commercial Pt/C (0.16 A·mgPt−1). The PtCu1.60/C exhibits 140,000 cycles durability without activity decline and surface PtCu cluster stability owing to unique structure derived from the matrix and epitaxial growth pattern, which effectively prevents the agglomeration of clusters and loss of near-surface active sites. Structure characterization and theoretical calculations confirm that Pt-rich PtCu clusters favor ORR activity and thermodynamic stability. In room-temperature polymer electrolyte membrane fuel cells, the PtCu1.60/C shows enhanced performance and delivers a power density of 154.1/318.8 mW·cm2 and 100 h/50 h durability without current density decay in an air/O2 feedstock.

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Nano Research
Pages 2252-2258
Cite this article:
Zhao F, Zheng L, Yuan Q, et al. PtCu subnanoclusters epitaxial on octahedral PtCu/Pt skin matrix as ultrahigh stable cathode electrocatalysts for room-temperature hydrogen fuel cells. Nano Research, 2023, 16(2): 2252-2258. https://doi.org/10.1007/s12274-022-5026-7
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Received: 13 July 2022
Revised: 16 August 2022
Accepted: 08 September 2022
Published: 03 November 2022
© Tsinghua University Press 2022
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