非对称气体扩散电极对空冷自增湿质子交换膜燃料电池性能的影响

INFLUENCE OF ASSYMMETRIC GAS DIFFUSION ELECTRODE ON PERFORMANCE OF AIR-COOLED SELF-HUMIDIFYING PROTON EXCHANE MEMBRANE FUEL CELL

通过对阴极和阳极气体扩散电极(GDE)采用不同厚度的碳纸、不同PEFE载量等方法研究了非对称气体扩散电极对空冷自增湿燃料电池性能的影响。通过实验得出:增大阳极扩散层厚度、减小阴极扩散层厚度均能提高电池性能,而且通过提高阳极疏水性,降低阴极疏水性,能够保证促进阳极保水和阴极排水,提高电池性能。得到的阳极PTFE含量60%,阴极PTFE含量20%的非对称型GDE组装的电池性能比PTFE含量40%的对称疏水GDE制备的PEMFC性能高5%,比商业的SIGRACET^(?)高9.16%。电池在50℃自增湿条件下工作的最大功率达到643.2mW·cm^(-2)。

In this paper, influences of asymmetric GDEs on PEMFC performance with different thickness carbon papers and different PTFE loading were studied. Experimental results indicated that increase anode carbon paper thickness and decrease that of cathode will increase fuel cell performances, furthermore, enhance anode GDE hydrophobicity and reduce that of cathode will benefit in anode water content and cathode flooding preventing, which will in turn enhance fuel cell performances. In this study, fuel cell with asymetric anode GDE with 60% FFFE and cathode with 20% PTFE shows 5% power higher than symmetric 40% PTFE GDEs and 9.16% higher than commercial SIGRACET GDEs. The fuel cell provides 643.2mW· cm^-2 maximum power density with self-humidifying condition at 50℃.