催化层位置对气体扩散电极性能的影响

Effect of Catalyst Layer Location on Performance of Gas Diffusion Electrode

以锌空气电池气体扩散电极为研究对象,采用分层添加催化剂的方式研究了改变催化层位置对气体扩散电极放电性能的影响。将气体扩散电极以集流体为中心分为两面:面向空气侧的A面与面向电解液侧的B面。根据催化剂添加位置的不同,制作四类电极:AB两面都添加催化剂、AB两面都不添加催化剂、只在A面添加催化剂、只在B面添加催化剂。在同等条件下对比并分析四类电极的放电效果。实验证明,当催化层位于气体扩散电极的空气侧(A面)时,整个电池的浓差极化与欧姆极化都会增大,而只在气体扩散电极靠近电解液侧(B面)添加催化剂时电极放电性能相对较好。

Take gas diffusion electrode of zinc-air battery for example and add catalyst by layers, we studied the effect of changing catalyst layer location on the performance of gas diffusion electrode. Based on the current collection, the cathode can be divided into two sides as A side and B side. Based on the catalyst location difference, four kinds of cathode have been made, where the catalyst was added to both sides, neither side, only A side and only B side. The discharge results of the four kinds of the cathodes were compared and analyzed under the same condition. Experiment shows that the performance of the gas diffusion electrode in which the catalyst layer was added to the electrolyte side（ B side） is better. The concentration polarization and Ohm polarization of the zinc-battery can be increased when the catalyst was added to the air side （ A side）.