文献类型：会议论文

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]E China Univ Sci & Technol, UNILAB, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China

会议论文集：4th Asia-Pacific Congress on Catalysis

会议日期：DEC 06-08, 2006

会议地点：Nanyang Technol Univ, Singapore, SINGAPORE

主办单位：Nanyang Technol Univ

语种：英文

外文关键词：carbon nanofiber; microstructures; oxygen reduction reaction; electrocatalytic properties

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 physicochemical properties of the CNFs are characterized by high resolution transmission electron microscope (HRTEM), N-2 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. (c) 2007 Elsevier B.V. All rights reserved.