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碳微球的微观结构及电催化活性表征研究

发表时间:2009-11-30  浏览量:1376  下载量:727
全部作者: 杜文,刘虹,郭巧梅,王晓敏,许并社
作者单位: 太原理工大学材料科学与工程学院;太原理工大学材料科学与工程学院、新材料界面科学与工程省部共建教育部重点实验室
摘 要: 对化学汽相沉积(chemical vapor deposition,CVD)法制备得到的碳微球(carbon microspheres,CMS)采用浸渍还原法合成了Pt/CMS复合材料,Pt载量分别为10%,20%和30%. 借助X射线衍射(X-ray diffraction,XRD)、电场发射扫描电子显微镜(field emission scanning electron microscope, FESEM)及X射线光电子能谱(X-photoelectron spectroscopy, XPS)对Pt/CMS复合材料进行微观结构与性能表征。结果表明,制得CMS粒径分布均匀,尺寸在300 nm左右。负载在CMS上的Pt粒子具有高度的均一性和良好的分散度,平均粒径为4~5 nm,符合最佳催化要求。XRD和XPS测试表明金属Pt含量较高。利用循环伏安法(cyclic voltammetry,CV)比较了3种载率Pt/CMS催化剂和20%Pt/Vulcan XC-72催化剂在酸性介质中的甲醇电催化性能,得出相同载量下以CMS为载体的催化剂的电化学活性要高于Vulcan XC-72;30%载量的Pt/CMS催化剂中Pt颗粒出现团聚。
关 键 词: 复合材料;Pt/CMS复合材料; 微观结构表征; 甲醇电氧化
Title: Microstructure characterization of carbon microspheres and the study of their electrocatalytic activities
Author: DU Wen,LIU Hong,GUO Qiaomei,WANG Xiaomin,XU Bingshe
Organization: College of Materials Science and Engineering, Taiyuan University of Technology;Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, College of Materials Science and Engineering, Taiyuan University of Technology
Abstract: Based on carbon microspheres(CMS) being prepared by chemical vapor deposition (CVD) method, Pt/CMS composites with different Pt loadings as 10%, 20% and 30% were prepared via impregnation-reduction method. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and X-photoelectron spectroscopy (XPS). It showed that Pt/CMS composites took on narrow diameter distributing, with the diameter of about 300 nm. The Pt particles possessed the high uniformity and good dispersity, whose average size in the range of 4~5 nm. XRD and XPS detections showed that Pt particles existed mainly in the metallic state. The methanol electrooxidation behaviors of Pt/CMS (10%, 20% and 30%) and Pt/Vulcan XC-72 (20%) in acid solution were evaluated by cyclic voltammetry (CV). The result indicated that Pt/CMS had the better electrochemistry performance than Pt/Vulcan XC-72; Pt particles became serious aggregation in Pt/CMS with 30% Pt loading.
Key words: composite material; Pt/CMS composites; microstructure characterization; methanol electrooxidation
发表期数: 2009年11月第22期
引用格式: 杜文,刘虹,郭巧梅,等. 碳微球的微观结构及电催化活性表征研究[J]. 中国科技论文在线精品论文,2009,2(22):2395-2401.
 
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