浸渍法制备硅钨酸修饰的炭载钯催化剂电催化甲酸氧化

Preparation of Silicotungstic Acid Modified Carbon Supported Pd Catalyst by Impregnation Method and Its Electrocatalytic Performance for Formic Acid Oxidation

用浸渍的方法制备了硅钨酸(SiWA)修饰的炭载Pd(Pd/C-SiWA)催化剂。计时电流曲线研究表明,在Pd/C和Pd/C-SiWA催化剂电极上,3000 s时的电流密度分别为0.013和0.082 A/mg,分别为10 s时电流密度的2.5%和14.1%。结果表明,Pd/C-SiWA催化剂对甲酸氧化的电催化稳定性要远远优于Pd/C催化剂。这是因为Pd/C催化剂上SiWA的修饰抑制了甲酸的自分解,从而减小了CO的毒化作用,改进了Pd/C催化剂对甲酸氧化的电催化和稳定性。

The silicotungstic acid（SiWA） modified carbon supported Pd（Pd/C-SiWA） catalyst was prepared with immersing method. The chronoamperometric experiment shows that the current density are 0. 013 A/mg and 0. 082 A/mg at 3000 s for the Pd/C and Pd/C-SiWA catalysts, which are the 2. 5% and 14. 1% of that at 10 s, respectively. The result suggests that the electrocatalytic activity and stability of the Pd/C-SiWA catalyst for formic acid oxidation are much better than that of the Pd/C catalyst. This is attributed to that the Pd/C-SiWA catalyst inhibits the decomposition of formic acid leading to the decrease in the poisoning effect of CO. Thus, the electrocatalytic stability of the Pd/C catalyst for formic acid oxidation is improved.