pH值对微波乙二醇法制备Pd/C催化剂性能影响  

Effect of pH value on performance of Pd/C catalysts prepared by microwave assisted ethylene glycol

作　　者：高子辰[1] 陈金伟[1] 刘双任 姜春萍[1] 王瑞林[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《电源技术》2014年第6期1010-1011,1029,共3页Chinese Journal of Power Sources

基　　金：国家自然科学基金(21306119);高等学校博士学科点专项科研基金(20110181110003);四川省应用基础研究(2013JY0150);四川省科技支撑计划(2013FZ0034);四川大学优秀青年学者基金(2013SCU04A23)

摘　　要：采用微波辅助乙二醇还原法在不同pH值条件下快速高效地制备了Pd/C催化剂,并分别采用X射线衍射光谱法(XRD)和透射电子显微镜法(TEM)技术表征样品的晶体结构和颗粒形貌,采用循环伏安法(CV)测试Pd/C催化剂电催化氧化甲酸的性能。XRD结果表明制得的催化剂均为Pd面心立方结构,随着还原pH值的增高,样品的相对结晶度降低,平均粒径减小。TEM结果表明,当NaOH加入量为0.7 mL、pH=10.2时,催化剂的平均粒径为(3.0±0.7)nm,颗粒粒径分散性较好,也表现出最好的电催化性能。从CV曲线可见,随着pH的增高制得的Pd/C催化剂电催化氧化的性能先提高后降低,Pd/C-10.2氧化峰电位下Pd的质量比活性达到1 590 mA/mg,分别是Pd/C-9.0和Pd/C-12.1的3倍和2.5倍。Pd/C catalysts were prepared by microwave assisted ethylene glycol reduction method under the conditions of different pH values. XRD and TEM were used to characterize the crystal structure and particle morphology of catalysts, respectively. And the performance of electrocatalytic oxidation of formic acid of the Pd/C catalyst was characterized by CV. XRD results show that all prepared catalysts display the typical character of Pd face center cubic phase and the relative crystalline and average particle diameter decrease with increasing reduction pH value. TEM results show that the catalyst average particle size is （3.0 ± 0.7） nm with good dispersion when the pH value is 10.2 with the addition of 0.7 mL NaOH. And the catalyst prepared under such a condition also obtaines the best electrocatalytic performance. The CV curves show the electrocatalytic oxidation performance of prepared Pd/C catalyst starts to evaluate, then decrease, and the Pd catalytic activity of Pd/C-10.2 oxidation peak potential is 1 590 mNmg, which is about respectively as much 3 times and 2.5 times as that of Pd/C-9.0 and Pd/C-12.1.

关 键 词：直接甲酸燃料电池 PD C 微波辅助乙二醇法 PH值 

分 类 号：TM911[电气工程—电力电子与电力传动]