热压复合的燃料电池用亲水-憎水复合电极

Hydrophilic-hydrophobic composite electrode for fuel cell combined by hot pressing

对憎水电极和亲水电极进行热压复合,制备了燃料电池用亲水-憎水复合气体扩散电极;通过极化曲线和电化学阻抗谱(EIS)等方法研究了电极结构对电池性能的影响。该复合电极既具有憎水电极气体扩散速度快的特点,又具有亲水电极质子传导通道多的优点,降低了电化学反应电阻,扩大了催化反应的三相界面,提高了燃料电池的性能。在电流密度为1000mA/cm2时,使用复合电极的电池的电压比使用亲水电极和憎水电极的电池分别高19.6%和15.1%。

A hydrophilic-hydrophobic composite gas diffusion electrode was prepared by combining the hydrophobic electrode and hydrophilic electrode through hot pressing. The effect of electrode structure on the cell performance was studied by polarization curves and electrochemical impedance spectroscopy（EIS）methods. The composite electrode combined the high gas diffusion viscosity performance of the hydrophobic electrode and the proton-conducting channel abundance characters of the hydrophilic electrode,enlarged the three phase boundary of catalytic reaction and decreased the electrochemical reaction resistance,improved the performance of the fuel cell. Compared with the cell using hydrophobic electrode and hydrophilic electrode,the voltage of cell using the composite electrode was about 19.6% and 15.1% higher when the current density was 1 000 mA/cm2.