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Communication

Boosting oxygen reduction in acidic media through integration of Pt-Co alloy effect and strong interaction with carbon defects

Nannan Ji1,§, Haoyun Sheng2,§, Shilong Liu1, Yangyuan Zhang1, Hongfei Sun1, Lingzhi Wei1, Ziqi Tian2( ), Peng Jiang4( ), Qianwang Chen3, Jianwei Su1( )
Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Anhui University, Hefei 230601, China
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
Hefei National Laboratory for Physical Science at Microscale, Department of Materials Science & Engineering, University of Science and Technology of China, Hefei 230026, China
International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China

§ Nannan Ji and Haoyun Sheng contributed equally to this work.

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Graphical Abstract

The optimization of Pt atom utilization efficiency can be achieved by simultaneously modifying the Pt-Co alloy and defective carbon substrate, contributing to the enhanced oxygen reduction reaction (ORR) performance in acidic media through integration of the alloy effect and the strong interaction between the Pt-Co alloy nanoparticles and topological carbon defects.

Abstract

Optimization of Pt atom utilization efficiency is critical for the development of proton-exchange-membrane fuel cells. Here we aim to develop an efficient oxygen reduction reaction (ORR) catalyst with a low Pt content through the concurrent modification of Pt-Co alloy catalysts and carbon substrate. In the present study, ultrafine Pt-Co alloy nanoparticles are successfully synthesized and stabilized by topological carbon defects via adopting the ammonia thermal treatment. Despite the low Pt loading, the obtained catalyst exhibits an impressive half-wave potential of 0.926 V versus the reversible hydrogen electrode in 0.1 M HClO4 electrolyte. Furthermore, the durability testing using the timed-current method demonstrates a tiny loss of only 3.6% after 12 h. Both experimental results and theoretical calculations demonstrate that topological carbon defects significantly enhance the charge transfer processes at the alloy/carbon interface, contributing to the strong electronic metal-support interactions between the Pt-Co alloy nanoparticles and topological carbon defects. These interactions, along with the alloy effect, play a crucial role in promoting the ORR performance in acidic media.

Keywords

electrocatalysisoxygen reduction reactionPt-Co alloyelectronic interactiontopological carbon defects

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Nano Research
Volume 17 Issue 9,
September 2024
Pages 7900-7908
DOI: 10.1007/s12274-024-6774-3
Cite this article:
Ji N, Sheng H, Liu S, et al. Boosting oxygen reduction in acidic media through integration of Pt-Co alloy effect and strong interaction with carbon defects. Nano Research, 2024, 17(9): 7900-7908. https://doi.org/10.1007/s12274-024-6774-3
Topics:
Oxygen reduction reaction

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Received: 09 April 2024
Revised: 08 May 2024
Accepted: 17 May 2024
Published: 02 July 2024
© Tsinghua University Press 2024
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