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

作　　者：王秀艳[1] 赵雪萍[2] 马树华[2] 

机构地区：[1]承德石油高等专科学校化学工程系,承德067000 [2]山东省氟化学化工材料重点实验室,济南大学化学化工学院,济南250022

出　　处：《应用化学》2013年第12期1470-1475,共6页Chinese Journal of Applied Chemistry

摘　　要：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.

关 键 词：直接甲酸燃料电池 炭载钯催化剂 硅钨酸修饰 甲酸氧化 甲酸分解 

分 类 号：O646[理学—物理化学]