TY - JOUR
T1 - Chelating functional group attached to carbon nanotubes prepared for performance enhancement of vanadium redox flow battery
AU - Noh, Chanho
AU - Moon, Seongeun
AU - Chung, Yongjin
AU - Kwon, Yongchai
N1 - Publisher Copyright:
© 2017 The Royal Society of Chemistry.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85031706847&partnerID=8YFLogxK
U2 - 10.1039/c7ta06672d
DO - 10.1039/c7ta06672d
M3 - Article
AN - SCOPUS:85031706847
SN - 2050-7488
VL - 5
SP - 21334
EP - 21342
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 40
ER -