A Three‐Dimensional Two‐Phase Model for a Membraneless Fuel Cell Using Decomposition of Hydrogen Peroxide with Y‐Shaped Microchannel
A Three‐Dimensional Two‐Phase Model for a Membraneless Fuel Cell Using Decomposition of Hydrogen Peroxide with Y‐Shaped Microchannel
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DOI：
10.1002/fuce.201200046
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发表时间：
2012-12
期刊：
影响因子：
2.8
通讯作者：
J. Peng;Z. Y. Zhang;H. Niu
中科院分区：
文献类型：
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作者：
J. Peng;Z. Y. Zhang;H. Niu
采用三维、两相、多组分混合模型，并结合基于有限体积法的计算流体动力学（CFD）技术，对具有Y形通道的无膜燃料电池的运行情况进行模拟。过氧化氢同时作为燃料和氧化剂，分别溶解在稀氢氧化钠溶液和稀硫酸溶液中。该模型考虑了燃料电池中几乎所有的传输现象，如流体流动、质量传输、电化学动力学以及电荷传输。假设阳极产生的氧气O₂ 气体不溶于溶液。气相的存在会阻碍反应物供应和产物排出过程。因此，在正常电流密度工况下运行时，电池性能会受到影响。另一方面，发现毛细作用可增强阳极多孔电极中的电解质传输，这可能会在高电流密度工况下略微提升电池性能。此外，由于气相从通道底部向顶部漂移，会引发二次涡流。混合区随之倾斜，这可能导致严重的燃料渗透现象。
A three‐dimensional, two‐phase, multi‐component mixture model in conjunction with a finite‐volume‐based computational fluid dynamics (CFD) technique is applied to simulate the operation of membraneless fuel cell with Y‐shape channel. Hydrogen peroxide is employed both as fuel and oxidant, which are dissolved in diluted sodium hydroxide and sulfuric acid solutions, respectively. Almost all transport phenomena occurring in the fuel cell such as fluid flows, mass transport, electrochemical kinetics, and charge transport are accounted in this model. The oxygen O2 gas, which is a product on the anode electrode, is assumed to be insoluble. The presence of gas phase acts to prevent the processes of reactant supply and product removal. Thus, the cell performance is hindered, while it is operated at the normal current density situation. On the other hand, the capillary action is found to enhance the electrolyte transport in the anode porous electrode, which may slightly improve the cell performance at the high‐current density situation. Besides, a secondary vortex flow is induced due to the transportation of the gas phase, which drifts from the bottom to the top of the channel. The mixing zone is then inclined, which may result in serious fuel crossing phenomenon.