不同方法制备Pt/C催化剂对燃料电池催化活性的影响

Influence of different preparation methods of Pt / C catalysts on electric catalytic activity

分别采用高压有机溶剂法和回流法不同的制备方法,制备了含铂20%(w)的催化剂Pt/C-HP(高压有机溶剂法)和Pt/C-Reflux(回流法)。实验发现:对于甲醇的阳极氧化过程,高压有机溶胶法制得的催化剂活性较高,催化剂Pt/C-HP甲醇氧化峰电流密度是Pt/C-Reflux的1.5倍,且远远高于商业催化剂JM3000含铂20%(w)Pt/C催化剂,催化剂Pt/C-Reflux甲醇氧化峰电流密度与商业催化剂JM3000催化剂相当。采用X射线衍射(XRD)、透射电镜(TEM)、循环伏安法(CV)等方法对催化剂进行表征的结果表明:高压有机溶胶法制得的催化剂分散性比回流法制得的催化剂好,使得前者催化剂的电化学活性比表面积得到了显著的提高。

High-pressure colloidal method（ denoted as Pt/C-HP） and the reflux method（ denoted as Pt/C-Reflux） were used to syn-thesis catalyst 20%（ w） Pt/C. We found that Pt/C-HP showed much higher activity than Pt/C-Reflux during the anodic oxidation of methanol. The peak current density for Pt/C-HP was 1. 5 times as high as that of Pt/C-Reflux and it was also much higher than that of the commercial JM3000（20%w）Pt/C catalyst. The peak current density for Pt/C-Reflux is similar with the commercial JM3000 （20%,w）Pt/C catalyst. X-ray diffraction analysis（XRD）,transmission electron microscopy（TEM）and the cyclic voltammograms CV method） etc. revealed that the dispersion for Pt/C-HP is better than that of Pt/C-Reflux whereas the electrochemical special sur-face area of Pt/C-HP increased significantly.