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Microfluidic fuel cell with arc-shaped electrodes to adapt to its mixing zone, a simulation study

Author

Listed:
  • Wu, Baoxin
  • Wu, Qingquan
  • Xu, Xinhai
  • Dong, Guangzhong
  • Zhang, Mingming
  • Leung, Dennis Y.C.
  • Wang, Yifei

Abstract

Fuel cells are well known for their uninterrupted power supply, high energy density, and environmental friendliness. Among them there is an emerging type for portable applications called microfluidic fuel cell (MFC), which has caught attention during the last twenty years. An MFC generally employs two electrolytes, namely the anolyte containing fuel and the catholyte containing oxidant, which flow in parallel inside a microchannel. In the middle, a narrow mixing zone is formed which has a typical cross section of hourglass shape. To better utilize this specific shape, an MFC with innovative arc-shaped electrodes is proposed in this work and validated via numerical simulation. The protruding electrode surface towards the channel middle can not only better utilize the limited channel space for more reaction sites, but also reshape the mixing layer to further prevent reactant crossover. Benefited from the enhanced convective transport as well as diffusive transport, the maximum power density with electrode radius of 2 mm is improved by 18.9% at the flow rate of 1000 μL/min and 20.7% at the flow rate of 100 μL/min, compared with conventional flat electrodes. Besides, the fuel utilization at 0.8 V is also improved by 30.4% at 1000 μL/min and 32.6% at 100 μL/min. This work provides a brand-new idea of optimizing the shape of MFC electrode, which can improve MFC performance indexes of both power density and fuel utilization at the same time.

Suggested Citation

  • Wu, Baoxin & Wu, Qingquan & Xu, Xinhai & Dong, Guangzhong & Zhang, Mingming & Leung, Dennis Y.C. & Wang, Yifei, 2024. "Microfluidic fuel cell with arc-shaped electrodes to adapt to its mixing zone, a simulation study," Applied Energy, Elsevier, vol. 376(PA).
    • Handle: RePEc:eee:appene:v:376:y:2024:i:pa:s0306261924015605
    DOI: 10.1016/j.apenergy.2024.124177
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    References listed on IDEAS

    as
    1. Li, Li & Fan, Wenguang & Xuan, Jin & Leung, Michael K.H. & Zheng, Keqing & She, Yiyi, 2017. "Optimal design of current collectors for microfluidic fuel cell with flow-through porous electrodes: Model and experiment," Applied Energy, Elsevier, vol. 206(C), pages 413-424.
    2. Wu, Baoxin & Xu, Xinhai & Dong, Guangzhong & Zhang, Mingming & Luo, Shijing & Leung, Dennis Y.C. & Wang, Yifei, 2024. "Computational modeling studies on microfluidic fuel cell: A prospective review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 191(C).
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    4. Wang, Yifei & Leung, Dennis Y.C. & Zhang, Hao & Xuan, Jin & Wang, Huizhi, 2017. "Numerical and experimental comparative study of microfluidic fuel cells with different flow configurations: Co-flow vs. counter-flow cell," Applied Energy, Elsevier, vol. 203(C), pages 535-548.
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