This study represents the experimental assessment of the faradaic, fuel, and energetic efficiency of active direct methanol fuel cell (DMFC). The experimental system was equipped with several sensors, HPLC and UV spectroscopy to make on‐line and off‐line measurements of different components. A polarization study was conducted and an experimental plan was applied to collect the process data during 3‐hour runs. Finally, stoichiometric and various efficiency calculations were performed based on the system and the process data. The results showed that the cell performance was better at higher operating temperatures (70.8 mW cm⁻² @75°C). Faradaic efficiency and fuel efficiency were better at low temperatures and estimated as 55.8% and 59.6% at 55°C, respectively. Energetic efficiency was better at higher temperatures due to the faster anode kinetics and was found as 12.3% at 75°C. The efficiencies were strongly dependent on methanol concentration. Methanol crossover was increased with increasing methanol concentration; hence the efficiencies were decreased.

中文翻译：

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DMFC效率性能的实验评估

这项研究代表了对活性直接甲醇燃料电池（DMFC）的法拉第，燃料和能量效率的实验评估。该实验系统配备了多个传感器，HPLC和UV光谱仪，可以对不同组件进行在线和离线测量。进行了极化研究，并应用了实验计划来收集3小时运行期间的过程数据。最后，基于系统和过程数据进行了化学计量和各种效率计算。结果表明，在更高的工作温度（70.8 mW cm ^-2）下电池性能更好@ 75°C）。在低温下，法拉第效率和燃料效率更高，在55°C时分别估计为55.8％和59.6％。由于阳极动力学更快，因此在较高温度下的能量效率更高，在75°C时为12.3％。效率在很大程度上取决于甲醇浓度。随着甲醇浓度的增加，甲醇的交换增加。因此效率降低了。