Influence of the Diffusion Media Structure for the Bubble Distribution in Direct Formic Acid Fuel Cells
Influence of the Diffusion Media Structure for the Bubble Distribution in Direct Formic Acid Fuel Cells
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DOI：
10.1149/1945-7111/abb565
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发表时间：
2020-01
影响因子：
3.9
通讯作者：
Konosuke Watanabe;T. Araki;T. Tsujiguchi;Gen Inoue
中科院分区：
文献类型：
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作者：
Konosuke Watanabe;T. Araki;T. Tsujiguchi;Gen Inoue
直接甲酸燃料电池(DFAFC)比其他直接液体燃料电池能产生更高的功率密度，因此受到了广泛的关注。然而，当产生的CO2气泡滞留在阳极的S多孔传输层中时，DFAFC的性能会恶化。因此，本文研究了碳纸和碳布两种不同类型的热释电fl的发电特性。结果表明，碳布的最大电流密度比碳纸的高约60 mA cm−2。用X射线计算机层析成像技术研究了阳极S PTLS中CO2气泡的分布情况，并讨论了气泡对DFAFC发电性能的影响。我们发现，碳布PTL中的空隙提供了气泡迁移和释放到通道中的路径，因此气泡不会恶化功率输出。碳纸PTL中的气泡堆积导致功率输出下降，说明PTL的结构和CO2气泡对发电特性有影响。fi。
Direct formic acid fuel cells (DFAFCs) have received considerable attention because they can generate a higher power density compared to other direct liquid fuel cells. However, when generated CO 2 bubbles are retained in the anode ’ s porous transport layer (PTL), the performance of the DFAFCs deteriorates. The gas – liquid two-phase fl ow behavior within a PTL is not clear; therefore, in this work the power-generation characteristics of DFAFCs using two types of PTL, carbon paper and carbon cloth, were investigated. It was found that the maximum current density was approximately 60 mA cm − 2 higher with the carbon cloth than with the carbon paper. The CO 2 bubble distribution in the anode ’ s PTLs was visualized by X-ray computed tomography and discuss the effects of the bubbles on the power-generation performance of DFAFCs. We found that interstices in a carbon-cloth PTL provided pathways for bubble migration and release to the channel, so that the bubbles did not deteriorate the power output. Bubble accumulation in a carbon-paper PTL led to a drop in power output, con fi rming that the structure of the PTL and the CO 2 bubbles affect the power-generation characteristics.