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Research Article

Integrating single Ni site and PtNi alloy on two-dimensional porous carbon nanosheet for efficient catalysis in fuel cell

Fangyao Zhou1,§, Yaner Ruan1,§, Feng Li1, Lin Tian1, Mengzhao Zhu1, Wenan Tie2, Xiaoyan Tian2, Bo Wang2, Peigen Liu1, Jie Xu3, Xiaoping Gao1, Peng Li1, Huang Zhou1( ), Yuen Wu1( )
Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei 230026, China
Shanxi Yanchang Petroleum (Group) Co. Ltd., Xian 710065, China
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China

§ Fangyao Zhou and Yaner Ruan contributed equally to this work.

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Graphical Abstract

An effective oxygen reduction reaction (ORR) relay catalysis system is constructed by coupling PtNi alloy nanoparticles (NPs) and single Ni sites on two-dimensional porous carbon nanosheet. Porous carbon support can enhance relay transfer of oxygen intermediates between active sites, which achieves boosted catalytical activity supported by experimental results and theoretical calculations.

Abstract

The performance of catalyst depends on the intrinsic activity of active sites and the structural characteristics of the support. Here, we simultaneously integrate single nickel (Ni) sites and platinum-nickel (PtNi) alloy nanoparticles (NPs) on a two-dimensional (2D) porous carbon nanosheet, demonstrating remarkable catalytic performance in the oxygen reduction reaction (ORR). The single Ni sites can activate the oxygen molecules into key oxygen-containing intermediate that is further efficiently transferred to the adjacent PtNi alloy NPs and rapidly reduced to H2O, which establishes a relay catalysis between active sites. The porous structure on the carbon nanosheet support promotes the transfer of active intermediates between these active sites, which assists the relay catalysis by improving mass diffusion. Remarkably, the obtained catalyst demonstrates a half-wave potential of up to 0.942 V, a high mass activity of 0.54 A·mgPt−1, and negligible decay of activity after 30,000 cycles, which are all superior to the commercial Pt/C catalysts with comparable loading of Pt. The theoretical calculation results reveal that the obtained catalyst with defect structure of carbon support presents enhanced relay catalytic effect of PtNi alloy NPs and single Ni sites, ultimately realizing improved catalytic performance. This work provides valuable inspiration for developing low platinum loading catalyst, integrating single atoms and alloy with outstanding performance in fuel cell.

Keywords

two-dimensional porous carbon nanosheetPt-based alloysingle atom catalystsrelay effectproton-exchange membrane fuel cells

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Nano Research
Volume 17 Issue 8,
August 2024
Pages 6916-6921
DOI: 10.1007/s12274-024-6692-4
Cite this article:
Zhou F, Ruan Y, Li F, et al. Integrating single Ni site and PtNi alloy on two-dimensional porous carbon nanosheet for efficient catalysis in fuel cell. Nano Research, 2024, 17(8): 6916-6921. https://doi.org/10.1007/s12274-024-6692-4
Topics:
Oxygen reduction reaction

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Received: 28 February 2024
Revised: 06 April 2024
Accepted: 08 April 2024
Published: 17 May 2024
© Tsinghua University Press 2024
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