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Issue 40, 2017
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Chelating functional group attached to carbon nanotubes prepared for performance enhancement of vanadium redox flow battery

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Abstract

A hydroxamic acid functionalized carbon nanotube (HAA-CNT) catalyst is prepared to determine its effect on VO2+/VO2+ and V2+/V3+ redox reactions and on the performance of a vanadium redox flow battery (VRFB), while its catalytic activity and VRFB performance are compared with those of pure CNTs and carboxylic acid functionalized CNT (CA-CNT) catalysts. According to the cyclic voltammetry measurements, HAA-CNT shows a better catalytic activity and reaction reversibility for vanadium redox reactions than CNT and CA-CNT because of the chelation ability of the HAA included in the HAA-CNT. With the role of chelating agent, the HAA group interacts well with vanadium ions, promoting their redox reactions. In particular, the HAA-CNT is more effective for the VO2+/VO2+ reaction than the V2+/V3+ reaction because of the larger number of oxygen atoms considered as active sites for the VO2+/VO2+ reaction. The role promoting VO2+/VO2+ reaction is confirmed by measuring charge transfer resistance efficiencies of a single cell VRFB. The chemical structure of the HAA-CNT is determined using X-ray photoelectron spectroscopy (XPS). Eventually, when the HAA-CNT is used as a positive electrode for the VO2+/VO2+ reaction, the performance of single cell VRFB is best.

Graphical abstract: Chelating functional group attached to carbon nanotubes prepared for performance enhancement of vanadium redox flow battery

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Publication details

The article was received on 29 Jul 2017, accepted on 19 Sep 2017 and first published on 19 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06672D
Citation: J. Mater. Chem. A, 2017,5, 21334-21342
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    Chelating functional group attached to carbon nanotubes prepared for performance enhancement of vanadium redox flow battery

    C. Noh, S. Moon, Y. Chung and Y. Kwon, J. Mater. Chem. A, 2017, 5, 21334
    DOI: 10.1039/C7TA06672D

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