Analysis of Mass Transport of Methanol at the Anode of a Direct Methanol Fuel Cell
Analysis of Mass Transport of Methanol at the Anode of a Direct Methanol Fuel Cell
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DOI：
10.1149/1.2201467
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发表时间：
2006-07
影响因子：
3.9
通讯作者：
Chao Xu;Ya-Ling He;T. Zhao;Rong Chen;Q. Ye
中科院分区：
文献类型：
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作者：
Chao Xu;Ya-Ling He;T. Zhao;Rong Chen;Q. Ye
我们对直接甲醇燃料电池（DMFC）阳极的质量转运进行了分析，并表明可以通过测量细胞限制电流密度来确定总体质量转移系数。我们测量了带有不同流场的内部工资型DMFC的细胞限制电流密度，用于各种甲醇浓度和甲醇溶液的流速。实验数据表明，尽管CO 2气泡解放的速率随电流密度变化，但总体质量转移系数几乎与电流密度无关。我们发现，随着甲醇流量的增加，由于甲醇流量的增加，甲醇流动场中的总甲醇转移系数可以显着增加。我们开发了相关方程，可预测给定DMFC硬件的甲醇流量的总体甲醇转移系数。最后，我们表明，基于DMFC中总体质量转移系数的相关方程与蛇纹石流场的不同流量与实验数据相当良好一致。
We present an analysis of the mass transport of methanol at the anode of a direct methanol fuel cell (DMFC) and show that the overall mass-transfer coefficient can be determined by measuring the cell limiting current density. We measured the cell limiting current density of an in-house-fabricated DMFC with different flow fields for various methanol concentrations and flow rates of methanol solution. The experimental data showed that the overall mass-transfer coefficient was nearly independent of current density, although the rate of CO 2 gas bubble liberation changed with current density. We found that the overall methanol-transfer coefficient in the serpentine flow field could be significantly increased with increased methanol flow rate due to the enhanced under-rib convection. We developed the correlation equations predicting the overall methanol transfer coefficient in terms of the methanol flow rate for a given DMFC hardware. Finally, we showed that the polarization curves predicted based on the correlation equation of the overall mass-transfer coefficient in the DMFC with the serpentine flow field for different flow rates were in fairly good agreement with the experimental data.