溶剂对DMFC阴极催化层微观结构的影响

Effect of different solutions on microstructure of cathode catalyst layer for direct methanol fuel cell

采用扫描电镜(SEM)、动态光散射仪(DLS)和电子探针微分析仪(EPMA)等研究了乙醇和乙二醇两种溶剂对直接甲醇燃料电池(DMFC)阴极催化层微观结构的影响。结果表明,与乙醇相比,采用乙二醇为溶剂配制催化剂浆液制得的催化层更为平整;催化剂粒子和Nafion聚合物在溶液和催化层中的分布都更为均匀;催化层电化学活性表面积提高了约29.6%;在80℃、常压6倍化学计量比(100mA/cm2)空气流速下,单电池最高功率密度提高了57.9%。

Effects of ethanol and glycol in catalyst ink on the microstructure of direct methanol fuel cells （DMFCs） cathode catalyst layer were investigated by SEM, EPMA, DLS, and et al. It was found that the catalyst layer prepared with glycol-made ink showed smoother surface, the catalyst particles and Nation polymer were distributed more even in both solution and catalyst layers, the electrochemical surface area （ESA） of cathode catalyst layer increased 29.6%, the peak power density of DMFC increased 57.9% at 80 ℃ and ambient air pressure with stoichiometric （100 mA/cm^2） of 6, in compared with the catalyst layer prepared with ethanol-made ink.