標題: The size effect of titania-supported Pt nanoparticles on the electrocatalytic activity towards methanol oxidation reaction primarily via the bifunctional mechanism
作者: Ting, Chao-Cheng
Liu, Chung-Hsuan
Tai, Chun-Yen
Hsu, Shih-Chieh
Chao, Chih-Shuan
Pan, Fu-Ming
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Pt nanoparticle;Titania;Plasma-enhanced atomic layer deposition;Methanol oxidation reaction;Bifunctional mechanism;Electronic effect
公開日期: 15-四月-2015
摘要: We prepared Pt nanoparticles of different particle sizes by plasma enhanced atomic layer deposition (PEALD) on the native oxide surface layer of Ti thin films, and investigated the Pt particle size effect on the electrocatalytic activity towards methanol oxidation reaction (MOR) in acidic media. The average Pt nanoparticles size ranges from 3 nm to 7 nm depending on the number of the PEALD reaction cycles. The electronic interaction between Pt nanoparticles and the TiO2 support is insignificant according to x-ray photoelectron spectroscopy analyses, suggesting that the influence of the Pt particle size on the electrocatalytic activity can be mainly described by the bifunctional mechanism. From cyclic voltammetry measurements, Pt particles of smaller size have a better CO tolerance in MOR. We proposed the reaction steps for the electrooxidation of CO adspecies on Pt nanoparticles on the basis of the bifunctional mechanism. The electrode with Pt nanoparticles of similar to 5 nm in size shows the best electrocatalytic performance in terms of CO tolerance and electrochemical stability. (C) 2015 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jpowsour.2015.01.081
http://hdl.handle.net/11536/124457
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2015.01.081
期刊: JOURNAL OF POWER SOURCES
Volume: 280
起始頁: 166
結束頁: 172
顯示於類別:期刊論文