TY - JOUR
T1 - Functionalized single-walled carbon nanotubes with enhanced electrocatalytic activity for Br- / Br3- redox reactions in vanadium bromide redox flow batteries
AU - Rui, Xianhong
AU - Parasuraman, Aishwarya
AU - Liu, Weiling
AU - Sim, Dao Hao
AU - Hng, Huey Hoon
AU - Yan, Qingyu
AU - Lim, Tuti Mariana
AU - Skyllas-Kazacos, Maria
PY - 2013/11
Y1 - 2013/11
N2 - 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 Br-/Br3- 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 Br -/Br3- 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.
AB - 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 Br-/Br3- 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 Br -/Br3- 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.
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U2 - 10.1016/j.carbon.2013.07.099
DO - 10.1016/j.carbon.2013.07.099
M3 - Article
AN - SCOPUS:84883600531
SN - 0008-6223
VL - 64
SP - 464
EP - 471
JO - Carbon
JF - Carbon
ER -