Li Yifan, Hu Jing, Papavasiliou Joan, Fu Zhiyong, Chen Li, Li Haibin
State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Department of Materials Science, University of Patras, 26504 Patras, Greece.
Membranes (Basel). 2022 Jul 23;12(8):728. doi: 10.3390/membranes12080728.
This work exhibits an effective approach to enhance the performance of membrane-electrode assembly (MEA) with KH(PO)-doped PBI membrane, by adding phosphoric acid (PA) in the catalyst layer (CL). The ohmic resistance and single-cell performance of the MEA, treated with PA, are reduced by ~80% and improved by ~800%, respectively, compared to that of untreated MEA. Based on the MEA pretreated with PA, the influence of humidity and temperature on the resistance and the single-cell performance are investigated. Under humidified gas conditions, the ohmic resistance of MEA is reduced but the charge transfer resistance is slightly increased. Regarding the effect of temperature, the ohmic resistance of MEA becomes lower as the temperature elevates from 140 to 180 °C, but increases at 200 °C. The maximum peak power density presents at 180 °C and 20% RH with 454 mW cm. The peak power density is favored with temperature increase from 140 to 180 °C, but decreases with further increase to 200 °C. Moreover, when dry gas conditions are employed, the output performance is unstable, suggesting that humidification is necessary to inhibit degradation for a long-term stability test.
这项工作展示了一种有效的方法，即通过在催化剂层（CL）中添加磷酸（PA）来提高掺杂KH(PO)的PBI膜的膜电极组件（MEA）的性能。与未处理的MEA相比，用PA处理后的MEA的欧姆电阻降低了约80%，单电池性能提高了约800%。基于用PA预处理的MEA，研究了湿度和温度对电阻及单电池性能的影响。在加湿气体条件下，MEA的欧姆电阻降低，但电荷转移电阻略有增加。关于温度的影响，当温度从140℃升高到180℃时，MEA的欧姆电阻降低，但在200℃时增加。最大峰值功率密度出现在180℃和20%相对湿度下，为454 mW/cm²。峰值功率密度在温度从140℃升高到180℃时增加，但在进一步升高到200℃时降低。此外，当采用干燥气体条件时，输出性能不稳定，这表明加湿对于长期稳定性测试中抑制降解是必要的。
