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Boosting the power density of direct borohydride fuel cells to >600 mW cm−2 by cathode water management

Author

Listed:
  • Jiang, Wenxing
  • Wan, Fangfang
  • Wan, Qiqi
  • Zhang, Endao
  • Chen, Zhenying
  • Zhang, Yang
  • Luo, Jianbin
  • Liu, Yingying
  • Zhuang, Xiaodong
  • Zhang, Junliang
  • Ke, Changchun

Abstract

Direct borohydride fuel cell (DBFC) has garnered significant interest due to its high energy density. However, the power density remains insufficient for commercial applications. Lots of works have been conducted on the kinetics of the anode reaction, while little attention has been devoted to cathode water management which is important issue for direct liquid fuel cell. Herein, a new structure gas diffusion layer (GDL) with hetero-junction double microporous layer (HJD-MPL) is developed. Utilizing the HJD-MPL structure, achieving a peak power density of 688 mW cm−2 at 80 °C, which exceeds the literature reports (453 mW cm−2). With higher porosity, permeability and stronger gradient capillary force, the oxygen transfer resistance is reduced from 75.5 s cm−1 of commercial GDL to 24.4 s cm−1. This study offers new insight into DBFCs, emphasizing cathode engineering to advance more effective and reliable direct liquid fuel cell technologies.

Suggested Citation

  • Jiang, Wenxing & Wan, Fangfang & Wan, Qiqi & Zhang, Endao & Chen, Zhenying & Zhang, Yang & Luo, Jianbin & Liu, Yingying & Zhuang, Xiaodong & Zhang, Junliang & Ke, Changchun, 2025. "Boosting the power density of direct borohydride fuel cells to >600 mW cm−2 by cathode water management," Applied Energy, Elsevier, vol. 378(PB).
    • Handle: RePEc:eee:appene:v:378:y:2025:i:pb:s0306261924023225
    DOI: 10.1016/j.apenergy.2024.124939
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