文献类型：期刊文献

英文题名：Effect of carbon nanofiber surface functional groups on oxygen reduction in alkaline solution

作者：Zhong, Ren-Sheng[1];Qin, Yuan-Hang[1];Niu, Dong-Fang[1];Tian, Jing-Wei[1];Zhang, Xin-Sheng[1];Zhou, Xin-Gui[1];Sun, Shi-Gang[2];Yuan, Wei-Kang[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China

年份：2013

卷号：225

起止页码：192

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20125015779859);WOS:【SCI-EXPANDED(收录号:WOS:000313923400029)】；

基金：The present study was supported by the Nature Science Foundation of China (21073061), the State Key Laboratory of Physical Chemistry of Solid surfaces (Xiamen University), the State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology (Zhejiang University of Technology), and the 111 Project (B08021).

语种：英文

外文关键词：Oxygen reduction reaction; Electrocatalyst; Carbon nanofiber; Surface functional groups

摘要：Carbon nanofibers (CNFs) with different content of surface functional groups which are carboxyl groups (CNF-OX), carbonyl groups (CNF-CO) and hydroxyl groups (CNF-OH) and nitrogen-containing groups (CNF-ON) are synthesized, and their electrocatalytic activities toward oxygen reduction reaction (ORR) in alkaline solution are investigated. The result of X-ray photoelectron spectroscopy (XPS) characterization indicates that a higher concentration of carboxyl groups, carbonyl groups and hydroxyl groups are imported onto the CNF-OX, CNF-CO and CNF-OH, respectively. Cyclic voltammetry shows that both the oxygen- and nitrogen-containing groups can improve the electrocatalytic activity of CNFs for ORR. The CNF-ON/GC electrode, which has nitrogen-containing groups, exhibits the highest current density of ORR. Rotating disk electrode (RDE) characterization shows that the oxygen reduction on CNF-ON/GC electrode proceeds almost entirely through the four-electron reduction pathway, the CNF-OX/GC, CNF-CO/GC and CNF-OH/GC electrodes proceed a two-electron reduction pathway at low potentials (-0.2 V to -0.6 V) followed by a gradual four-electron reduction pathway at more negative potentials, while the untreated carbon nanofiber (CNF-P/GC) electrode proceeds predominantly by a two-electron reduction pathway within the whole range of potential studied. (C) 2012 Elsevier B.V. All rights reserved.