羰基和砜基共交联磺化聚酰亚胺质子交换膜的高温燃料电池性能及各向异性

High Tempreture Fuel Cell Performance and Anisotropy of Carbonyl and Sulfone Groups Co-crosslinked Sulfonated Polyimides Proton Exchange Membranes

研究了羰基和砜基共交联聚酰亚胺膜M1C和M2C的膜溶胀和质子传导的各向异性,以及在高温和低湿度条件下燃料电池的发电和耐久性能.研究结果表明,M1C和M2C膜厚方向溶胀比砜基交联质子交换膜(R1C)的小,且无显著的膜面方向尺寸变化.M1C和M2C的膜厚方向质子传导率明显大于R1C.温度、压力和相对湿度在很大程度上影响了燃料电池的性能.在相同条件下,M1C的燃料电池发电性能优于R1C.90℃时,较高的相对湿度(RH)82%下,M1C和R1C具有与Nafion相近的发电性能;随着相对湿度降低到27%,M1C的电池性能显著降低,但仍高于R1C.随着操作温度从90℃提高到110℃,所有质子交换膜的性能都大幅下降.在0.2 MPa及RH为49%时,M1C的最大输出功率比R1C高21%.当电池压力上升至0.3 MPa后,M1C的最大输出功率从0.2 MPa时的0.17 W/cm^2提高到0.38 W/cm^2.M1C在110℃下连续运行330 h后性能未见明显下降,说明羰基和砜基共交联的磺化聚酰亚胺质子交换膜具有良好的高温燃料电池耐久性能.

Anisotropic properties of membrane swelling and proton conductivity of carbonyl and sulfone groups co-crosslinked sulfonated polyimides（ SPI） proton exchange membranes（ M1 C,M2C） were reported in this paper. Fuel cell performance and durability under high temperature and relative low humidification were investigated in detail. The results showed that dimensional changes of M1 C and M2 C were lower than that of sulfone group crosslinked R1 C in thickness and no obviously change in plane direction. The through-plane proton conductivities of M1 C and M2 C were significantly larger than that of R1 C. The operation conditions of temperature,back pressureand relative humidity largely affected the proton exchange membrames of fuel cell（ PEMFC） performance in connection with each other. The PEMFC performance of M1 C was better than that of R1 C in the similar conditions. At 90 ℃ and relatively high humidification of 82%RH,the crosslinked PEMs showed high fuel cell performances which were comparable to NR212. As the humidification reduced to 27%RH,the fuel cell performance of M1 C largely decreased,but still kept in a reasonably high level and higher than that of R1 C. With the operation temperature increased from 90 ℃ to 110 ℃,cell performances of all the SPI PEMs decreasedlargely. At 0. 2 MPa and 49% RH,the maximum output of M1 C was 21% higher than R1 C. The maximum output of M1 C largely increased from 0. 17 W/cm2 at 0. 2 MPa to 0. 38 W/cm2 at 0. 3MPa. The PEMFC with M1 C operated at 110 ℃ for 330 h without obviously degradation in cell performance.The result indicated that carbonyl and sulfone groups co-crosslinked SPI PEMs have high temperature fuel cell durability.