The performance and durability of high-temperature proton exchange membrane fuel cells enhanced by single-layer graphene

Jianuo Chen, Josh J. Bailey, Liam Britnell, Maria Perez-Page, Madhumita Sahoo, Zhe Zhang, Andrew Strudwick, Jennifer Hack, Zunmin Guo, Zhaoqi Ji, Philip Martin, Dan J.L. Brett, Paul R. Shearing, Stuart M. Holmes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Single-layer graphene (SLG) obtained by chemical vapor deposition is applied between membrane and electrodes by a wet chemical transfer method to study its effect on the performance and durability of polybenzimidazole membranes in high-temperature proton exchange membrane fuel cells (HT-PEMFCs). After accelerated stress testing (AST), the membrane electrode assembly (MEA) loaded with SLG at different positions exhibits higher peak power density, lower electrode resistances, and larger electrochemical active surface area than pure polybenzimidazole membranes with high phosphoric acid doping level. The peak power density of the MEAs with both cathode and anode loaded with SLG is 480 mW cm-2 after AST, while those based on pure membranes is 249 mW cm-2. Lab-based X-ray micro-computed tomography combined with Raman spectroscopic mapping was applied for the first time to study the effect of SLG on controlling phosphoric acid leaching. In addition, samples containing SLG on an ultra-thin membrane (7.5 µm) were also tested to explore its influence on hydrogen crossover. After 100 h of galvanostatic discharging, the hydrogen crossover of samples loaded with single-layer graphene on the anode does not exceed 1.75 × 10−4 mol s-1, which is much lower than that of MEAs made using pure ultra-thin membranes (8.16 ×10−4 mol s-1).

Original languageEnglish
Article number106829
JournalNano Energy
Volume93
Early online date11 Dec 2021
DOIs
Publication statusPublished - Mar 2022

Bibliographical note

Funding Information:
This work has been financially supported by the United Kingdom Research Council EPSRC EP/009050/1 , EP/T517793/1 .

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Chemical vapor deposition
  • High-temperature fuel cells
  • Phosphoric acid leaching
  • Single-layer graphene
  • X-ray micro-computed tomography

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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