文献类型：期刊文献

英文题名：Microstructure effect of carbon nanofiber on electrocatalytic oxygen reduction reaction

作者：Zheng, Jun-Sheng[1]; Zhang, Xin-Sheng[1,2]; Li, Ping[1]; Zhou, Xing-Gui[1]; Yuan, Wei-Kang[1]

机构：[1] UNILAB, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, 200062, China

年份：2008

卷号：131

期号：1-4

起止页码：270

外文期刊名：Catalysis Today

收录：EI(收录号：20080511066164)

语种：英文

外文关键词：Electrocatalysis - High resolution transmission electron microscopy - Microstructure - Oxygen - Reduction - Synthesis (chemical)

摘要：Carbon nanofibers (CNFs) with controlled microstructures, i.e. platelet CNF (p-CNF), fish-bone CNF (f-CNF) and tube CNF (t-CNF), are synthesized, and their behaviors in electrocatalytic oxygen reduction reaction (ORR) in acid media are investigated in this paper. The physico-chemical properties of the CNFs are characterized by high resolution transmission electron microscope (HRTEM), N2 adsorption-desorption and Raman spectrum. Cyclic voltammetry experiments show that the CNFs have higher ORR activities than graphite. The p-CNF, which has the highest ratio of edge atoms to basal atoms, demonstrates the most positive ORR onset potential and ORR peak potential. The f-CNF, which has the largest amounts of ORR active sites, exhibits the highest ORR peak current. The t-CNF demonstrates the most negative ORR onset potential, negative ORR peak potential, and the least ORR peak current, which is a result of the fewest catalytic active sites. Furthermore, the microstructures of CNFs can impact the reaction process. The ORR on p-CNF or f-CNF is controlled by diffusion, while the ORR on t-CNF is jointly controlled by surface reaction and diffusion. ? 2007 Elsevier B.V. All rights reserved.