Journal of Energy Chemistry ›› 2023, Vol. 76 ›› Issue (1): 448-458.DOI: 10.1016/j.jechem.2022.09.028

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Synthesis of phosphonated graphene oxide by electrochemical exfoliation to enhance the performance and durability of high-temperature proton exchange membrane fuel cells

Jianuo Chena, Zunmin Guoa, Maria Perez-Pagea, Yifeng Jiab, Ziyu Zhaoa, Stuart M. Holmesa,*   

  1. aDepartment of Chemical Engineering and Analytical Science, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom;
    bChemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
  • Received:2022-05-29 Revised:2022-09-09 Accepted:2022-09-15 Published:2023-01-10
  • Contact: *E-mail address: stuart.holmes@manchester.ac.uk (S.M. Holmes).

Abstract: The doping of functionalized graphene oxide (GO) in the membranes becomes a promising method for improving the performance of high-temperature proton exchange membrane fuel cells (HT-PEMFC). Phosphonated graphene oxide (PGO) with a P/O ratio of 8.5% was quickly synthesised by one-step electrochemical exfoliation based on a three-dimensiaonal (3D) printed reactor and natural graphite flakes. Compared with the GO prepared by the two-step electrochemical exfoliation method, the PGO synthesized by the one-step electrochemical exfoliation can better improve the performance of the membrane-electrode-assembly (MEA) based on the polybenzimidazole (PBI) membrane in the HT-PEMFC. The doping of 1.5 wt% GO synthesised by electrochemical exfoliation with the 2-step method or reactor method in PBI increased the peak power density by 17.4% or 35.4% compared to MEA based on pure PBI membrane at 150 °C, respectively. In addition, the doping of PGO in PBI improves its durability under accelerated stress test (AST).

Key words: Electrochemical exfoliation, Phosphonated graphene oxide, High-temperature fuel cells