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Research Article

Ultra-stable Pt5La intermetallic compound towards highly efficient oxygen reduction reaction

Siyuan Zhu1,2Liting Yang1,2Jingsen Bai1,2Yuyi Chu1,2Jie Liu1,2Zhao Jin1,2Changpeng Liu1,2Junjie Ge1,2,3( )Wei Xing1,2( )
State Key Laboratory of Electroanalytical Chemistry, Laboratory of Advanced Power Sources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
School of Applied Chemistry and Engineering, University of Science and Technology of China, University of Science and Technology of China (USTC), Hefei 230026, China
Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian 116023, China
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Pt-rare earth intermetallic alloys synthesized by a facile method towards for oxygen reduction reactions.

Abstract

Designing feasible electrocatalysts towards oxygen reduction reaction (ORR) requires advancement in both activity and stability, where attaining high stability is of extreme importance as the catalysts are expected to work efficiently under frequent start-up/shut down circumstances for at least several thousand hours. Alloying platinum with early transition metals (i.e., Pt–La alloy) is revealed as efficient catalysts construction strategy to potentially satisfy these demands. Here we report a Pt5La intermetallic compound synthesized by a novel and facile strategy. Due to the strong electronic interactions between Pt and La, the resultant Pt5La alloy catalyst exhibits enhanced activity with half wave of 0.92 V and mass activity of 0.49 A·mgPt−1, which strictly follows the 4e transfer pathway. More importantly, the catalyst performs superior stability during 30,000 cycles of accelerated stressed test (AST) with mass activity retention of 93.9%. This study provides new opportunities for future applications of Pt-rare earth metal alloy with excellent electrocatalytic properties.

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Nano Research
Pages 2035-2040
Cite this article:
Zhu S, Yang L, Bai J, et al. Ultra-stable Pt5La intermetallic compound towards highly efficient oxygen reduction reaction. Nano Research, 2023, 16(2): 2035-2040. https://doi.org/10.1007/s12274-022-4868-3
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Received: 10 June 2022
Revised: 26 July 2022
Accepted: 04 August 2022
Published: 22 September 2022
© Tsinghua University Press 2022
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