TY - JOUR
T1 - Adenosine-Derivative Functionalized Carbon Nanotubes Considered as Catalysts for Vanadium Flow Batteries
T2 - Adenosine-Derivative Functionalized Carbon Nanotubes…
AU - Shin, Mingyu
AU - Oh, Yumin
AU - Kwon, Yongchai
N1 - Publisher Copyright:
© The Author(s), under exclusive licence to Korean Institute of Chemical Engineers, Seoul, Korea 2024.
PY - 2024/12
Y1 - 2024/12
N2 - Vanadium flow battery (VFB) is one of the various candidates considered for energy storage systems. To further improve the performance of VFBs, adding functional groups to the surface of carbon nanotube (CNT) to provide more active sites for promoting redox reactions of vanadium ions is one desirable way. For the purpose, adenosine (AD) and adenosine monophosphate (AMP) attached carboxylic acid functionalized CNTs (CACNT) (ADCNT and AMPCNT) are used as the catalysts. Furthermore, proper co-doping of N, O or N, P, O atoms included in AD and AMP may increase diversity of active sites. In this regard, ADCNT and AMPCNT are considered better catalysts than CACNT for increasing the reaction rate of vanadium ions because a large number of hydrophilic groups belonged to ADCNT and AMPCNT can maximize contact between catalyst and electrolyte. Quantitatively, charge transfer resistance is decreased by ~ 37.6% (ADCNT) and ~ 42.3% (AMPCNT), while peak reversibility is ~ 5.8% improved with the new catalysts. Regarding performance evaluations, voltage and energy efficiencies of VFBs using AMPCNT are best even at 250 mA cm−2, proving the above benefits of AMPCNT catalyst. Conclusively, this study confirms that larger functional groups compared to those traditionally used can act as effective catalysts, while multi-atom co-doped catalysts can be used for the performance improvement of VFBs.
AB - Vanadium flow battery (VFB) is one of the various candidates considered for energy storage systems. To further improve the performance of VFBs, adding functional groups to the surface of carbon nanotube (CNT) to provide more active sites for promoting redox reactions of vanadium ions is one desirable way. For the purpose, adenosine (AD) and adenosine monophosphate (AMP) attached carboxylic acid functionalized CNTs (CACNT) (ADCNT and AMPCNT) are used as the catalysts. Furthermore, proper co-doping of N, O or N, P, O atoms included in AD and AMP may increase diversity of active sites. In this regard, ADCNT and AMPCNT are considered better catalysts than CACNT for increasing the reaction rate of vanadium ions because a large number of hydrophilic groups belonged to ADCNT and AMPCNT can maximize contact between catalyst and electrolyte. Quantitatively, charge transfer resistance is decreased by ~ 37.6% (ADCNT) and ~ 42.3% (AMPCNT), while peak reversibility is ~ 5.8% improved with the new catalysts. Regarding performance evaluations, voltage and energy efficiencies of VFBs using AMPCNT are best even at 250 mA cm−2, proving the above benefits of AMPCNT catalyst. Conclusively, this study confirms that larger functional groups compared to those traditionally used can act as effective catalysts, while multi-atom co-doped catalysts can be used for the performance improvement of VFBs.
KW - Adenosine
KW - Adenosine monophosphate
KW - Carboxylic acid functionalized carbon nanotube
KW - Functional group
KW - Vanadium flow battery
UR - https://www.scopus.com/pages/publications/85208182872
U2 - 10.1007/s11814-024-00324-w
DO - 10.1007/s11814-024-00324-w
M3 - Article
AN - SCOPUS:85208182872
SN - 0256-1115
VL - 41
SP - 3821
EP - 3830
JO - Korean Journal of Chemical Engineering
JF - Korean Journal of Chemical Engineering
IS - 14
M1 - 101482
ER -
