Effect of heat treatment on the performance of TiO2-Pt/CNT catalysts for methanol electro-oxidation

被引：91

作者：

Song, Huanqiao ^{[1
,2
]}

Qiu, Xinping ^{[1
]}

Li, Fushen ^{[2
]}

机构：

[1] Tsinghua Univ, Dept Chem, Key Lab Organ Optoelect & Mol Engn, Beijing 100084, Peoples R China

[2] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2008年 / 53卷 / 10期

基金：

中国国家自然科学基金;

关键词：

methanol oxidation; electro-catalysts; heat treatment; CO stripping; direct methanol fuel cell;

D O I：

10.1016/j.electacta.2007.11.080

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 [应用化学];

摘要：

TiO2-Pt/CNT catalysts before and after heat treatment were prepared. Their catalytic activities for methanol and CO electro-oxidation were studied in detail. The results showed that the proper amount of hydrous TiO2 in TiO2-Pt/CNTs (e.g. heated at 200C for 2 h) was favorable for enhancing the catalytic activity of Pt/CNTs, which provided evidence for bi-functional mechanism. The studies on the catalysts with different TiO2/Pt molar ratio displayed that the optimum molar ratio varied with the increase of heat treatment temperature. It was found that the optimum molar ratio of TiO2/Pt was at 1:2 for the catalysts without heat treatment and was at 1:1 for the catalysts by heat treatment at 500C. This fact was ascribed to the difference in compact degree between TiO2 and Pt/CNTs before and after heat treatment. Considering the influence of heating temperature, it was found that TiO2-Pt/CNT catalyst heated at 200C for 2 h had better catalytic activity for methanol oxidation. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：3708 / 3713

页数：6

共 25 条

[1]

Synthesis of PtRu/carbon nanotube composites in supercritical fluid and their application as an electrocatalyst for direct methanol fuel cells [J].