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Justifying the significance of Knudsen diffusion in solid oxide fuel cells

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  • Yang, Fei
  • Gu, Jianmin
  • Ye, Luhan
  • Zhang, Zuoxiang
  • Rao, Gaofeng
  • Liang, Yachun
  • Wen, Kechun
  • Zhao, Jiyun
  • Goodenough, John B.
  • He, Weidong

Abstract

Developing an appropriate diffusion mechanism to analyze the gas transport in porous electrodes of SOFCs (solid oxide fuel cells), has been a crucial step towards analyzing accurately the cell performance. In this report, the errors in evaluating the gas diffusivity, limiting current density and concentration polarization, are calculated quantitatively by taking bulk diffusion and the previously-overlooked Knudsen diffusion into account. In particular, this work analyzes the deviation between ignoring and considering the Knudsen diffusion of hydrogen transport in SOFC anodes. The study facilitates the rational pre-evaluation of micro- and nanoscale materials prior to assembly into SOFCs.

Suggested Citation

  • Yang, Fei & Gu, Jianmin & Ye, Luhan & Zhang, Zuoxiang & Rao, Gaofeng & Liang, Yachun & Wen, Kechun & Zhao, Jiyun & Goodenough, John B. & He, Weidong, 2016. "Justifying the significance of Knudsen diffusion in solid oxide fuel cells," Energy, Elsevier, vol. 95(C), pages 242-246.
    • Handle: RePEc:eee:energy:v:95:y:2016:i:c:p:242-246
    DOI: 10.1016/j.energy.2015.12.022
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    References listed on IDEAS

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    Cited by:

    1. Jiao, Yong & Zhang, Liqin & An, Wenting & Zhou, Wei & Sha, Yujing & Shao, Zongping & Bai, Jianping & Li, Si-Dian, 2016. "Controlled deposition and utilization of carbon on Ni-YSZ anodes of SOFCs operating on dry methane," Energy, Elsevier, vol. 113(C), pages 432-443.
    2. Błesznowski, Marcin & Sikora, Monika & Kupecki, Jakub & Makowski, Łukasz & Orciuch, Wojciech, 2022. "Mathematical approaches to modelling the mass transfer process in solid oxide fuel cell anode," Energy, Elsevier, vol. 239(PA).
    3. Dang, Zheng & Xu, Han, 2016. "Pore scale investigation of gaseous mixture flow in porous anode of solid oxide fuel cell," Energy, Elsevier, vol. 107(C), pages 295-304.

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