一步微波有机溶胶法制备燃料电池Pt/C电催化剂  

Preparation of Fuel Cell Pt/C Catalyst by a One-Step Microwave Organic Sol Method

作　　者：吴燕妮[1] 陈志胜[1] 莫再勇[1] 闫鹏[1] 王赵志[1] 

机构地区：[1]肇庆学院,广东肇庆526061

出　　处：《稀有金属材料与工程》2017年第3期841-846,共6页Rare Metal Materials and Engineering

基　　金：广东省自然科学基金博士启动项目(S2012040007383);广东省教育厅科技创新项目(2013KJCX0193);肇庆学院2014年大学生创新创业训练项目(DC201440)

摘　　要：采用一步微波有机溶胶法制备了系列20%Pt/C燃料电池催化剂。考察了不同硝酸浓度氧化处理碳粉的表面、微波反应时间以及还原剂乙二醇(EG)的用量等因素对催化剂电催化活性的影响。实验发现:无论是阳极还是阴极反应,处理碳粉时硝酸浓度为40%、微波反应时间70 s时制备的催化剂活性最好;然而,阳极甲醇氧化时制备催化剂EG用量较少、活性高,阴极氧还原时EG用量较多反而有利。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测试。结果表明,不同考察因素对于活性组分的结构、晶型及粒径没有太大影响,但对电化学活性比表面积和电催化活性有显著影响。The carbon-supported fuel cell platinum catalysts 20%Pt/C were prepared by a one-step microwave-colloidal method. The influence of the nitric acid concentration used in carbon powder catalyst carrier, the microwave reaction time and the dosage of ethylene glycol reluctant on the electric catalytic activity of the catalyst was investigated. X-ray diffraction analysis（XRD）, transmission electron microscopy（TEM） and cyclic voltammetry（CV） were used to test the catalysts. Results show that the activity is the best when the concentration of nitric acid is 40% and the microwave reaction time is 70 s during both the anode and the cathode reactions. When the catalyst is used for methanol oxidation, lower dosage of EG leads to higher activity, while for oxygen reduction higher dosage of EG is better instead. In addition, the structure, crystal form and the particle size change slightly under different preparation conditions whereas the electrochemical special surface area and electric catalytic activity are influenced significantly.

关 键 词：燃料电池 铂碳负载型催化剂 微波有机溶胶法 制备条件 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O643.36[理学—物理化学]