厚壁和薄壁碳纳米管载Pt催化剂制备和对甲醇氧化的电催化活性  

Preparation and Electrocatalytic Activity of Pt Catalysts Supported on Nanotubes with Thick and Thin Walls for Methanol Oxidation

作　　者：张俊松[1] 李海涛 唐亚文[1] 陈煜[1] 包建春[1] 周益明[1] 陆天虹[1,3] 

机构地区：[1]南京师范大学化学与环境科学学院,南京210097 [2]江苏电视大学武进学院,武进 [3]中国科学院长春应用化学研究所,长春130022

出　　处：《应用化学》2008年第3期290-294,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(20573057,20473038,20433060);江苏省科技厅基金(BK2006224);江苏省教育厅基金(05KJB150061)资助项目

摘　　要：制备了壁厚约5nm、管径为140～220nm薄壁碳纳米管（CNTs）和壁厚约50nm，管径为80．200nm厚壁碳纳米管。研究了浓HNO3处理对不同壁厚CNTs结构和表面基团的影响。结果表明，经硝酸处理后，厚壁CNTs的双电层充放电电量（Qd）和表面含氧基团氧化所需电量（Qo）分别增加了1．34和0．098 mC，薄壁CNTs的Qd和Qo分别增加了5．69和0．175mC。表明与厚壁CNTs相比，薄壁CNTs易被切断，表面碳原子易被氧化。当用常规液相还原法将Pt粒子沉积在薄壁和厚壁CNTs上后，由于浓HNO3处理过的薄壁CNTs具有大的比表面积和多的含氧基团，Pt粒子更容易均匀的吸附在薄壁CNTs表面，因此，制得的Pt／CNTs催化剂对甲醇氧化有很高的电催化活性。CNTs with 5 nm wall thickness and 140 -220 nm tube diameter as well as CNTs with 50 nm wall thickness and 80 - 200 nm tube diameter were prepared, and the effects of the pretreatment of the two kinds of CNTs with concentrated HNO3 on the structure and surface groups of the CNTs were studied. It was found that after the pretreatment, the amount of the charge and discharge of the double electrode layer for the CNTs with the thick wall（Qd） and the amount of the electricity for the oxidation of the oxygen-containing groups on the CNTs surface（ Qo ） increased by 1.34 and 0. 098 mC, respectively, while for the CNTs with the thin wall, they increased by 5.69 and 0. 175 mC, respectively. The result indicates that the CNTs with the thin wall are easier to break apart and the carbon atoms on the Wall surface easier to oxidize when the CNTs are treated with concentrated HNO3. When the Pt particles obtained with the general liquid phase reduction method were deposited on the CNTs surfaces pretreated, the Pt particles were easier to uniformly adsorb on the surface of the CNTs with the thin wall, due to the fact that the specific surface area of the CNTs with the thin wall after the pretreatment was larger and the content of the oxygen-containing groups was higher. Therefore, the electrocatalytic activity of the Pt catalyst supported on the CNTs with the thin wall after the pretreatment was very high for methanol oxidation.

关 键 词：铂催化剂 碳纳米管 甲醇 直接甲醇燃料电池 

分 类 号：O646[理学—物理化学]