文献类型：期刊文献

英文题名：Effect of carbon nanofiber microstructure on oxygen reduction activity of supported palladium electrocatalyst

作者：Zheng, Jun-Sheng[1]; Zhang, Xin-Sheng[1]; Li, Ping[1]; Zhu, Jun[1]; Zhou, Xing-Gui[1]; Yuan, Wei-Kang[1]

机构：[1]E China Univ Sci & Technol, UNILAB, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2007

卷号：9

期号：5

起止页码：895

外文期刊名：ELECTROCHEMISTRY COMMUNICATIONS

收录：;EI(收录号：20071710570503);WOS:【SCI-EXPANDED(收录号:WOS:000246608800008)】；

语种：英文

外文关键词：carbon nanofiber; microstructure; electrocatalyst; oxygen reduction reaction; cyclic voltammetry

摘要：Palladium electrocatalysts supported on carbon nanofibers (CNFs) with controlled microstructure or on activated carbon (AC) are prepared, and the effects of the carbon materials microstructure on the oxygen reduction reaction (ORR) properties of the electrocatalysts are investigated. The physical properties of the CNFs with different microstructure, i.e. platelet CNF (p-CNF) and fish-bone CNF (f-CNF), are characterized by high resolution transmission electron microscope and N-2 physisorption. From cyclic voltammetric studies, it is found that Pd/p-CNF and Pd/f-CNF are more active than Pd/AC. The effects of CNF microstructure on the ORR activities of Pd/f-CNF and Pd/p-CNF are discussed. The p-CNF has a higher ratio of edge atoms to basal atoms, and therefore Pd/p-CNF has more positive ORR onset reduction potential and ORR peak potential than Pd/f-CNF. The supports also have influences on the reaction process. The ORR is surface reaction controlled when Pd/AC is used, while it becomes diffusion control when Pd/f-CNF is used. (c) 2006 Elsevier B.V. All rights reserved.