The performance of both air-breathing and air-feeding direct formic acid membraneless fuel cells (DFAMFCs) possessing different flow fields were numerically investigated in this study at given concentration and flow rate for both fuel and electrolyte. Single serpentine, stepwise broadening serpentine, multi-serpentine and parallel channel were tested as liquid flow field, while single serpentine, stepwise broadening serpentine, multi-serpentine and pin channel were tested as air flow field. The channel width was either 0.8 mm or 1.3 mm. The simulation results showed that the air-breathing DFAMFC having identical flow field for both fuel and electrolyte yielded highest cell output. The air-breathing DFAMFC having SBS liquid flow field yielded a maximum power density of 10.5 mW/cm², while the air-breathing DFAMFC having S(1.3) liquid flow field produced an open circuit voltage of 1.0 V owing to few formic acid penetration into the cathode. Concerning the air-feeding DFAMFCs, the DFAMFC having SBS liquid flow field and MS(0.8) air flow field yielded highest peak power density, 12 mW/cm², at an airflow rate of 500 sccm. Considering the power generated by the DFAMFCs together with the power consumed by the air pump, DFAMFC having SBS liquid flow field and Pin(0.8) air flow field could be the preferred design.

中文翻译：

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流场对直接甲酸无膜燃料电池性能的影响：数值研究

在给定的浓度和流量下，对燃料和电解质进行了数值研究，研究了具有不同流场的空气呼吸和空气馈送直接甲酸无膜燃料电池（DFAMFC）的性能。将单蛇形，逐步加宽蛇形，多蛇形和平行通道作为液体流场进行测试，而单蛇形，逐步加宽蛇形，多蛇形和销形通道作为空气流场进行测试。通道宽度为0.8mm或1.3mm。仿真结果表明，对于燃料和电解质，具有相同流场的透气DFAMFC产生了最高的电池输出。具有SBS液体流场的空气呼吸DFAMFC产生的最大功率密度为10.5 mW / cm ²，而具有S（1.3）液体流场的空气呼吸DFAMFC由于几乎没有甲酸渗透到阴极中而产生1.0 V的开路电压。关于空气馈送DFAMFC，具有SBS液体流场和MS（0.8）空气流场的DFAMFC以500sccm的气流速率产生了最高的峰值功率密度，即12mW / cm ²。考虑到DFAMFC产生的功率以及气泵消耗的功率，具有SBS液体流场和Pin（0.8）空气流场的DFAMFC可能是首选设计。