Gas convection in fuel cells: An overlooked factor

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• 作者：Zuoxiang Zhang^a ; ¹ ; Junyi Cui^a ; ¹ ; Shangqun Zhang^a ; ¹ ; Weiqiang Lv^a ; Fei Yang^a ; Kechun Wen^a ; ^b ; Kelvin H.L. Zhang^c ; John B. Goodenough^d ; ; Weidong He^a ; ^{weidong.he@uestc.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Fuel cells ; gas convection ; temperature gradient ; limiting current density ; concentration ; polarization
• 刊名：Electrochimica Acta
• 出版年：2015
• 出版时间：10 September 2015
• 年：2015
• 卷：176
• 期：Complete
• 页码：1476-1483
• 全文大小：2127 K

文摘

Gas transport in the porous electrode plays a crucial role in the performance of fuel cells. Inthis work, gas convection caused by temperature gradient, typically ignored in the analysis of gastransport in fuel cells, has been evaluated quantitatively. The correlation of gas convection with gas pressure and electrode thickness is investigated systematically. In addition, limiting current density loss caused by temperature gradient and the associated concentration polarization (CP) are evaluated analytically. Our work facilitates a comprehensive understanding of gas transport in electrodes and the improvement in the electrochemical performances of fuel cells.