碳纳米管表面修饰程度对碳纳米管载Pt电催化性能的影响  

Effect of Surface Modification Extent of Carbon Nanotubes on Electrocatalytic Performance of Carbon Nanotubes Supported Pt catalyst

作　　者：陈煜[1] 唐亚文[1] 孔令涌 刘长鹏[3] 邢巍[3] 陆天虹[1,4] 

机构地区：[1]南京师范大学化学与环境科学学院 [2]深圳市纳米港有限公司 [3]中国科学院长春应用化学研究所 [4]中国科学院长春应用化学研究所,长春130022

出　　处：《物理化学学报》2006年第1期119-123,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划(973)(G2000026408);国家高技术研究发展规划(863)(2003AA517060);国家自然科学基金(20373068;20433060;20573057);江苏省科技厅高新技术基金(BG2003022);江苏省教育厅高校自然科学基金(JH02-080;05KJ150061);国家"211"工程重点资助项目

摘　　要：比较了用不同温度的浓HNO3处理的碳纳米管(CNTs)作载体的Pt(Pt/CNTs)对甲醇氧化的电催化活性.结果表明浓HNO3处理使CNTs表面修饰上的含氧基团对CNTs上沉积Pt粒子的平均粒径有较大影响.表面修饰程度适当时,制得的Pt/CNTs中Pt粒子较小,因此,对甲醇氧化的电催化活性较高.而表面修饰程度过大,易使Pt粒子团聚,从而降低Pt/CNTs催化剂对甲醇氧化的电化学活性.Based on the synthesis and purification of carbon nanotubes （CNTs）, CNTs were treated with concentrated HNO3 solution at 50, 75, and 100 ℃ for 5 h. After CNTs were treated in concentrated HNOa solution at 75℃ for 5 h, suitable amount of hydrophilic O-containing surface groups would be formed so that the average size of the Pt particles deposited on the CNTs surface is small, about 3.7 nm, leading to the good electrocatalytic activity of the Pt/CNTs catalyst for the methanol oxidation. If the treatment temperature is as low as 50 ℃, the amount of the hydrophilic O- containing surface groups formed on CNTs is small so that the Pt particles formed on CNTs would be easy to aggregate. If the treatment temperature is as high as 100℃, the amount of the hydrophilic O-containing surface groups formed on CNTs is large and the CNTs would be opened. Then, the Pt particles formed on CNTs would be concentrated near the fractures and form large Pt particles, leading to the low electrocatalyfic activity of the Pt/CNTs catalyst for the methanol oxidation.

关 键 词：碳纳米管 PT 催化剂 甲醇 

分 类 号：O646[理学—物理化学]