还原温度对Pt/C催化剂性能的影响  

Effect of reduction temperature on Pt/C catalyst performance

作　　者：张焰峰[1] 李忠[1] 杨书廷[2] 曹朝霞[2] 

机构地区：[1]华南理工大学化工与能源学院,广东广州510640 [2]河南师范大学化学与环境科学学院,河南新乡453002

出　　处：《电池》2004年第5期328-330,共3页Battery Bimonthly

基　　金：河南省科技攻关项目(0324210007)

摘　　要：为了研究制备温度对质子交换膜燃料电池(PEMFC)用Pt/C催化剂性能的影响,采用离子交换法在不同温度制备了Pt/C催化剂,并采用电化学工作站测试了不同温度样品的电催化活性,分别使用N2吸附、TEM、XRD测定了样品的孔隙、粒径和晶相结构。结果表明:当还原温度为800℃时,Pt/C催化剂具有较大的比表面积和较发达的孔隙结构,颗粒粒径较小,有利于O2还原的Pt(100)晶面含量较大,以样品为催化剂的PEMFC具有较高的功率输出,所以800℃是制备高催化活性的纳米Pt/C的合适温度。In order to investigate the effects of preparation temperature on Pt/C catalyst for PEMFC, Pt/C catalysts were prepared by ion-exchange method at various temperatures. Electrochemistry station was used to study the electrocatalytic activity of samples. The porosity, particle size and crystalline structure of samples were analyzed by nitrogen adsorption, TEM and XRD tests, respectively. It was found that the Pt/C catalyst reduced at 800 ℃ had higher specific surface area and porosity than the other samples. Furthermore, its particle size decreased, and its crystal phase of Pt(100) for O_2 reduction was increased compared with the other samples. This resulted in larger output power for PEMFC with Pt/C catalyst reduced at 800 ℃.The results indicated that 800 ℃ was an appropriate temperature for preparing Pt/C catalyst with high electrocatalytic activity.

关 键 词：PT/C催化剂 制备 粒径 性能 比表面积 电催化活性 晶相结构 PEMFC 质子交换膜燃料电池 用电 

分 类 号：TM911.42[电气工程—电力电子与电力传动]