Functionalized single-walled carbon nanotubes with enhanced electrocatalytic activity for redox reactions in vanadium bromide redox flow batteries

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• 作者：Xianhong Rui ; Aishwarya Parasuraman ; Weiling Liu ; Dao Hao Sim ; Huey Hoon Hng ; Qingyu Yan ; Tuti Mariana Lim ; Maria Skyllas-Kazacos
• 刊名：Carbon
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：64
• 期：Complete
• 页码：464-471
• 全文大小：2018 K

文摘

Pristine graphite, multi-walled carbon nanotubes (MWCNTs), singe-walled carbon nanotubes (SWCNTs), and functionalized SWCNTs with large numbers of oxygen-containing groups (FSWCNTs) have been used as electrocatalysts for the redox couple reactions in the positive half-cell of the vanadium bromide redox battery. The structure, composition, and electrochemical properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrochemical activity of the FSWCNTs-modified electrodes for the redox couple reactions is greatly increased relative to graphite and other carbon nanotube-modified electrodes and the electrochemical kinetics of the redox reactions are in the order of FSWCNTs > SWCNTs > MWCNTs > graphite. This result suggests that the oxygen functional groups significantly facilitate the electron transfer processes, by providing active sites for the reactions and enhancing the effective electrode area.