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Research Article | Open Access

PtZn nanoparticles supported on porous nitrogen-doped carbon nanofibers as highly stable electrocatalysts for oxygen reduction reaction

Lei Zhaoa,1, Jinxia Jiangb,1, Shuhao Xiaoa, Zhao Lia, Junjie Wanga, Xinxin Weia, Qingquan Kongc, Jun Song Chena, Rui Wua( )
School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu, 611731, PR China
Chongqing Medical and Pharmaceutical College, Chongqing, 401331, PR China
Institute for Advanced Study, Chengdu University, Chengdu, 610106, PR China

1 These authors contributed equally to this work.

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Abstract

The oxygen reduction reaction (ORR) electrocatalytic activity of Pt-based catalysts can be significantly improved by supporting Pt and its alloy nanoparticles (NPs) on a porous carbon support with large surface area. However, such catalysts are often obtained by constructing porous carbon support followed by depositing Pt and its alloy NPs inside the pores, in which the migration and agglomeration of Pt NPs are inevitable under harsh operating conditions owing to the relatively weak interaction between NPs and carbon support. Here we develop a facile electrospinning strategy to in-situ prepare small-sized PtZn NPs supported on porous nitrogen-doped carbon nanofibers. Electrochemical results demonstrate that the as-prepared PtZn alloy catalyst exhibits excellent initial ORR activity with a half-wave potential (E1/2) of 0.911 ​V versus reversible hydrogen electrode (vs. RHE) and enhanced durability with only decreasing 11 ​mV after 30,000 potential cycles, compared to a more significant drop of 24 ​mV in E1/2 of Pt/C catalysts (after 10,000 potential cycling). Such a desirable performance is ascribed to the created triple-phase reaction boundary assisted by the evaporation of Zn and strengthened interaction between nanoparticles and the carbon support, inhibiting the migration and aggregation of NPs during the ORR.

Keywords

PtZn alloyPorous nitrogen-doped carbon nanofibersElectrospinningOxygen reduction reaction

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Nano Materials Science
Volume 5 Issue 3,
September 2023
Pages 329-334
DOI: 10.1016/j.nanoms.2022.04.001
Cite this article:
Zhao L, Jiang J, Xiao S, et al. PtZn nanoparticles supported on porous nitrogen-doped carbon nanofibers as highly stable electrocatalysts for oxygen reduction reaction. Nano Materials Science, 2023, 5(3): 329-334. https://doi.org/10.1016/j.nanoms.2022.04.001

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Published: 27 April 2022
© 2022 Chongqing University.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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