Cheng Geng, Li Zhen, Ren Shan, Han Dongmei, Xiao Min, Wang Shuanjin, Meng Yuezhong
The Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China.
Polymers (Basel). 2021 Feb 10;13(4):523. doi: 10.3390/polym13040523.
As a key component of direct methanol fuel cells, proton exchange membranes with suitable thickness and robust mechanical properties have attracted increasing attention. On the one hand, a thinner membrane gives a lower internal resistance, which contributes highly to the overall electrochemical performance of the cell, on the other hand, strong mechanical strength is required for the application of proton exchange membranes. In this work, a sulfonated poly (fluorenyl ether ketone) (SPFEK)-impregnated polyimide nanofiber mat composite membrane (PI@SPFEK) was fabricated. The new composite membrane with a thickness of about 55 μm exhibited a tensile strength of 35.1 MPa in a hydrated state, which is about 65.8% higher than that of the pristine SPFEK membrane. The antioxidant stability test in Fenton's reagent shows that the reinforced membrane affords better oxidation stability than does the pristine SPFEK membrane. Furthermore, the morphology, proton conductivity, methanol permeability, and fuel cell performance were carefully evaluated and discussed.
作为直接甲醇燃料电池的关键组件，具有合适厚度和强大机械性能的质子交换膜受到了越来越多的关注。一方面，较薄的膜具有较低的内阻，这对电池的整体电化学性能有很大贡献；另一方面，质子交换膜的应用需要强大的机械强度。在这项工作中，制备了一种磺化聚（芴基醚酮）（SPFEK）浸渍的聚酰亚胺纳米纤维毡复合膜（PI@SPFEK）。这种厚度约为55μm的新型复合膜在水合状态下的拉伸强度为35.1MPa，比原始SPFEK膜高出约65.8%。在芬顿试剂中的抗氧化稳定性测试表明，增强后的膜比原始SPFEK膜具有更好的氧化稳定性。此外，还对其形态、质子传导率、甲醇渗透率和燃料电池性能进行了仔细评估和讨论。
