Nitrogen-doped mesoporous carbon for energy storage in vanadium redox flow batteries
We demonstrate a novel electrode material-nitrogen-doped mesoporous carbon (NMC)-for vanadium redox flow batteries. Mesoporous carbon (MC) is prepared using a soft-template method and doped with nitrogen by heat-treating MC in NH3. NMC is characterized with X-ray photoelectron spectroscopy and transmission electron microscopy. The redox reaction of [VO]2+/[VO2]+ is characterized with cyclic voltammetry and electrochemical impedance spectroscopy. The electrocatalytic kinetics of the redox couple [VO]2+/[VO2]+ is significantly enhanced on NMC electrode compared with MC and graphite electrodes. The reversibility of the redox couple [VO]2+/[VO2]+ is greatly improved on NMC (0.61 for NMC vs. 0.34 for graphite). Nitrogen doping facilitates the electron transfer on the electrode/electrolyte interface for both oxidation and reduction processes. NMC is a promising electrode material for redox flow batteries.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 974938
- Report Number(s):
- PNNL-SA-70343; JPSODZ; TRN: US201007%%897
- Journal Information:
- Journal of Power Sources, Vol. 195, Issue 13; ISSN 0378-7753
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON
ELECTRODES
ELECTRON TRANSFER
ENERGY STORAGE
GRAPHITE
IMPEDANCE
KINETICS
NITROGEN
OXIDATION
REDOX REACTIONS
SPECTROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
VANADIUM
X-RAY PHOTOELECTRON SPECTROSCOPY
Nitrogen-doped mesoporous carbon for energy storage in vanadium redox flow batteries