不同接触电阻的气体扩散电极性能研究

Research on the performance of gas diffusion electrodes with different contact resistance

在催化剂与泡沫镍基板之间,采取涂抹式和表面接触式两种方式制作了具有不同接触电阻的气体扩散电极,通过观察微观形貌从理论上说明两种电极的接触方式引起的放电效果区别;结合在锌空气动力电池中的放电实验,获得在同等实验条件下,电极催化剂与基板采取表面接触式比涂抹式制作方式产生的电池表观内阻值高0.05Ω,当放电电流密度值为106mA/cm2,放电电压值低0.09V。说明了气体扩散电极由于催化剂与基板接触方式不同引起的接触电阻变化对电池放电状态的影响及其影响程度。

Two kinds of gas diffusion electrodes with different contact resistance were made by designing two different contact modes between the catalyst and the nickel foam base plate,one mode was the smear technique and the other was the surface contact mode.By observing the microscopic pattern and the contact area theoretical calculation,the difference of the discharge effect caused by the contact mode was illustrated from the theoretical analysis point of view.In the discharge experiment of the electrodes in the zinc-air power battery,under the same test condition,by comparing the discharge polarization curves,the battery with the gas diffusion electrode whose contact mode of the catalyst and the nickel foam was smear technique was better.The D-value of the apparent internal resistance between the two batteries was 0.05 Ω,and at the same current density（106 mA/cm2）,the D-value of the voltage was 0.09 V.The effect on the discharge of the battery by the contact resistance caused by the different contact mode between the catalyst and the nickel foam base plate was analyzed.