Yin Bibo, Liang Rui, Liang Xiaoxu, Fu Duo, Wang Lei, Sun Guoxing
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau, 999078, China.
Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China.
Small. 2021 Oct;17(43):e2103214. doi: 10.1002/smll.202103214. Epub 2021 Sep 30.
Proton exchange membrane fuel cells (PEMFCs) are promising devices for clean power generation in fuel cell electric vehicles applications. The further request of high-efficiency and cost competitive technology make high-temperature proton exchange membranes utilizing phosphoric acid-doped polybenzimidazole be favored because they can work well up to 180 °C without extra humidifier. However, they face quick loss of phosphoric acid below 120 °C and resulting in the limits of commercialization. Herein UiO-66 derived carbon (porous carbon-ZrO ), comprising branched poly(4,4'-diphenylether-5,5'-bibenzimidazole) and polyacrylamide hydrogels self-assembly (BHC1-4) membranes for wide-temperature-range operation (80-160 °C) is presented. These two-phase membranes contained the hygroscopicity of polyacrylamide hydrogels improve the low-temperature proton conductivity, relatively enable the membrane to function at 80 °C. An excellent cell performance of BHC2 membrane with high peak power density of 265 and 656 mW cm at both 80 and 160 °C can be achieved. Furthermore, this membrane exhibits high stability of frequency cold start-ups (from room temperature to 80 °C) and long-term cell test at 160 °C. The improvement of cell performance and stability of BHC2 membrane indicate a progress of breaking operated temperature limit in existing PEMFCs systems.
质子交换膜燃料电池（PEMFCs）是用于燃料电池电动汽车应用中清洁发电的有前景的装置。对高效且具有成本竞争力技术的进一步要求使得利用磷酸掺杂聚苯并咪唑的高温质子交换膜受到青睐，因为它们在高达180°C的温度下无需额外的加湿器就能良好运行。然而，它们在120°C以下会迅速失去磷酸，从而限制了商业化。在此，提出了一种由UiO-66衍生的碳（多孔碳-ZrO），其包含支化聚（4,4'-二苯醚-5,5'-联苯并咪唑）和聚丙烯酰胺水凝胶自组装（BHC1-4）膜，用于宽温度范围（80-160°C）运行。这些两相膜中聚丙烯酰胺水凝胶的吸湿性提高了低温质子传导率，相对地使膜能够在80°C下发挥作用。在80°C和160°C时，BHC2膜均可实现优异的电池性能，其峰值功率密度分别高达265和656 mW/cm²。此外，该膜在频繁冷启动（从室温到80°C）和160°C的长期电池测试中表现出高稳定性。BHC2膜电池性能和稳定性的提高表明在现有质子交换膜燃料电池系统中突破运行温度限制方面取得了进展。
