TY - JOUR
T1 - Effect of bismuth sulfate coated on acidified CNT on performance of vanadium redox flow battery
AU - Moon, Seongeun
AU - Kwon, Byeong Wan
AU - Chung, Yongjin
AU - Kwon, Yongchai
N1 - Publisher Copyright:
© 2019 The Electrochemical Society.
PY - 2019
Y1 - 2019
N2 - Bismuth sulfate (BiOS) is doped on acidified carbon nanotube (ACNT) (BiOS-ACNT) using sulfuric acid treatment and this is used as catalyst to improve the performance of vanadium redox flow battery (VRFB). Its catalytic activity is compared with that of pure CNT and ACNT. Regarding the redox reactivity of vanadium ions, BiOS-ACNT whose weight ratio is 1:3 exhibits the best catalytic activity and reaction reversibility for both VO 2+ /VO2+ and V 2+ /V3+ reactions because the abundant oxygen atoms are well produced during the conversion of bismuth (Bi) nanoparticle into BiOS, and they act as active site for promoting the reactions of VO 2+ /VO2+ and V 2+ /V3+. These are confirmed by calculating kinetic parameters, such as electron transfer rate constant and diffusion coefficient, while BiOS-ACNT shows the best values (0.21 s-1 and 6.46 × 10-8 cm2 s -1). In VRFB including BiOS-ACNT, the performance of BiOS-ACNT VRFB is enhanced with voltage and energy efficiencies of 87.6 and 81.9% at 80 mA cm-2. Furthermore, in 50 cycle test of 120 mA cm-2, BiOS-ACNT VRFB shows lower overpotential (0.2 V) and capacity loss rate (0.04% cycle-1) than other VRFBs. This proves that BiOS-ACNT is beneficial for enhancements in the performance and long-term stability of VRFB.
AB - Bismuth sulfate (BiOS) is doped on acidified carbon nanotube (ACNT) (BiOS-ACNT) using sulfuric acid treatment and this is used as catalyst to improve the performance of vanadium redox flow battery (VRFB). Its catalytic activity is compared with that of pure CNT and ACNT. Regarding the redox reactivity of vanadium ions, BiOS-ACNT whose weight ratio is 1:3 exhibits the best catalytic activity and reaction reversibility for both VO 2+ /VO2+ and V 2+ /V3+ reactions because the abundant oxygen atoms are well produced during the conversion of bismuth (Bi) nanoparticle into BiOS, and they act as active site for promoting the reactions of VO 2+ /VO2+ and V 2+ /V3+. These are confirmed by calculating kinetic parameters, such as electron transfer rate constant and diffusion coefficient, while BiOS-ACNT shows the best values (0.21 s-1 and 6.46 × 10-8 cm2 s -1). In VRFB including BiOS-ACNT, the performance of BiOS-ACNT VRFB is enhanced with voltage and energy efficiencies of 87.6 and 81.9% at 80 mA cm-2. Furthermore, in 50 cycle test of 120 mA cm-2, BiOS-ACNT VRFB shows lower overpotential (0.2 V) and capacity loss rate (0.04% cycle-1) than other VRFBs. This proves that BiOS-ACNT is beneficial for enhancements in the performance and long-term stability of VRFB.
UR - http://www.scopus.com/inward/record.url?scp=85073609165&partnerID=8YFLogxK
U2 - 10.1149/2.1181912jes
DO - 10.1149/2.1181912jes
M3 - Article
AN - SCOPUS:85073609165
SN - 0013-4651
VL - 166
SP - A2602-A2609
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 12
ER -
