改进液相还原法制备的Pd/C催化剂对甲酸氧化的电能  

Electrocatalytic Performance of Pd/C Catalyst Prepared with Improved Liquid Phase Reduction Method for Oxidation of Formic Acid

作　　者：陈滢[1] 唐亚文[1] 高颖[2] 陆天虹[1] 

机构地区：[1]南京师范大学化学与环境科学学院,南京210097 [2]哈尔滨师范大学理化学院化学系,哈尔滨150080

出　　处：《无机化学学报》2008年第4期560-564,共5页Chinese Journal of Inorganic Chemistry

基　　金：863计划(No2006AA05Z137);国家自然科学基金(No20573057,20573029);江苏省自然科学基金(NoBK2006224);江苏省教育厅自然科学基金(No05KJB150061)资助项目

摘　　要：用液相还原法制备炭载Pd(Pd/C)催化剂时,先用Na2CO3调节溶液pH值至8～9,然后加入还原剂还原PdCl2,由于PdCl2能与Na2CO3形成配合物,降低了得到的Pd粒子聚集倾向,使制得的Pd/C催化剂中Pd粒子的平均粒径和相对结晶度都较小,分别为3.57nm和1.37。而没有加Na2CO3制得的Pd/C催化剂中Pd粒子的平均粒径和相对结晶度均较大,分别为21.0nm和6.29。因此,用加Na2CO3制得的Pd/C催化剂对甲酸氧化的电催化活性和稳定性均要优于没有加Na2CO3时制得的Pd/C催化剂。因此,本文提出的改进的液相还原法既保持了制备Pd/C催化剂的简单性,又能得到性能很好的Pd/C催化剂。The electrocatalytic performance of the Pd/C catalyst prepared with the improved liquid phase reduction method was investigated using the electrochemical, X-ray diffraction（XRD）, transmission electron microspectroscopy （TEM）, ultravilet visible （UV-Vis） absorption spectroscopy. It is found that when the Pd/C catalyst is prepared with the improved liquid phase reduction method using Na2CO3 to adjust the pH value of the solution to 8-9 before adding the reduction reagent both the average size and relative crystalinity of the Pd particles in the Pd/C catalyst prepared are as small as 3.57 nm and 1.37, respectively. This is due to that PdCl2 and Na2CO3 can form the complex, leading to the decrease in the aggregation trend of the Pd particles and thus, the decrease in the average size and relative crystalinity of the Pd particles in the Pd/C catalyst. If Na2CO3 is not added, both the average size and relative crystalinity of the Pd particles in the Pd/C catalyst prepared are as large as 21.0 nm and 6.29, respectively. Therefore, the electrocatalytic activity and stability of the Pd/C catalyst prepared with the liquid phase reduction method with Na2CO3 are better than that of the Pd/C catalyst prepared without Na2CO3. Therefore, the improved liquid phase reduction method is still simple, while the electrocatalytic performance of the Pd/C catalyst prepared with the improved liquid phase reduction method is excellent.

关 键 词：甲酸 直接甲酸燃料电池 炭载钯催化剂 碳酸钠 

分 类 号：O613.71[理学—无机化学]