With the advantages of high energy density and low operating temperature, direct methanol fuel cell (DMFC) has been rated as the most promising portable energy device to replace the traditional lithium cell. However, the development of DMFC is limited by methanol crossover (MCO) and catalyst poisoning. To alleviate MCO, a DMFC with an integrated ultrasonic atomization fuel feeder is proposed in the present research. The open circuit voltage (OCV) and the polarization curves of the cell under a series of conditions are analyzed. The performances of the proposed DMFC are evaluated at different methanol concentrations and fuel feed rates. The mechanism of MCO is discussed from above experiments. Compared with liquid feed style, atomization feed style can reduce characteristic response time (CRT) and greatly alleviate MCO because the DMFC obtains a larger OCV value. It can be found from our experiments that atomization feed style can effectively improve cell performance and energy density. Moreover, atomization feed style under different methanol concentrations can obtain the best cell performance by adjusting feed rate. When the feed rate is 0.24 mL min⁻¹ and 0.6 mL min⁻¹, the best cell performance is obtained at 8M and 4M, respectively.

中文翻译：

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新型集成超声雾化燃料给料器直接甲醇燃料电池性能的实验研究

凭借高能量密度和低工作温度的优势，直接甲醇燃料电池（DMFC）被认为是替代传统锂电池的最有希望的便携式能源设备。然而，DMFC的发展受到甲醇交换（MCO）和催化剂中毒的限制。为了减轻MCO，在本研究中提出了一种带有集成超声雾化燃料进料器的DMFC。分析了一系列条件下电池的开路电压（OCV）和极化曲线。建议的DMFC的性能在不同的甲醇浓度和燃料进料速率下进行评估。通过以上实验讨论了MCO的机理。与液态饲料相比，雾化进料方式可以减少特征响应时间（CRT）并大大减轻MCO，因为DMFC获得了更大的OCV值。从我们的实验中可以发现，雾化进料方式可以有效地改善电池性能和能量密度。此外，在不同甲醇浓度下的雾化进料方式可以通过调节进料速率获得最佳的电池性能。当进料速度为0.24 mL min^-1和0.6 mL min ^-1，分别在8M和4M下获得最佳电池性能。