TY - JOUR
T1 - Enhancing Cycling Stability and Specific Capacitance of Vanadium Nitride Electrodes by Tuning Electrolyte Composition
AU - Haye, Emile
AU - Miao, Yuanyuan
AU - Pilloud, David
AU - Douard, Camille
AU - Boukherroub, Rabah
AU - Pierson, Jean François
AU - Brousse, Thierry
AU - Lucas, Stéphane
AU - Houssiau, Laurent
AU - Pireaux, Jean Jacques
AU - Achour, Amine
N1 - Publisher Copyright:
© 2022 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited
PY - 2022/6
Y1 - 2022/6
N2 - In this study, the tuning of the KOH electrolyte composition is proposed as a strategy to drastically limit the capacitance fade of vanadium nitride (VN) electrode. We demonstrate that the use of a V5+ (as VO43− vanadates anions) containing KOH electrolyte enhances the cycling stability of VN thin film electrode: a loss of 59% of the capacitance is observed for the electrode tested in KOH over 3000 consecutive cycles. After V5+ addition in the electrolyte, the capacitance fade is decreased to 23%. Furthermore, the presence of V5+ species in the solution leads to VN capacitance enhancement from 379 mF cm−2 for V5+ ions free electrolyte up to 577 mF cm−2 at 5 mV s−1 for V5+-containing KOH solution. The enhanced cycling stability is attributed to the stabilization of an oxide/oxynitride layer at the VN surface, instead of its dissolution, thanks to the chemical equilibrium shift of the VN dissolution reaction. This simple and innovative strategy consisting in tuning the electrolyte composition opens new pathways for other systems that suffer from electrode dissolution in the electrolyte while being electrochemically cycled.
AB - In this study, the tuning of the KOH electrolyte composition is proposed as a strategy to drastically limit the capacitance fade of vanadium nitride (VN) electrode. We demonstrate that the use of a V5+ (as VO43− vanadates anions) containing KOH electrolyte enhances the cycling stability of VN thin film electrode: a loss of 59% of the capacitance is observed for the electrode tested in KOH over 3000 consecutive cycles. After V5+ addition in the electrolyte, the capacitance fade is decreased to 23%. Furthermore, the presence of V5+ species in the solution leads to VN capacitance enhancement from 379 mF cm−2 for V5+ ions free electrolyte up to 577 mF cm−2 at 5 mV s−1 for V5+-containing KOH solution. The enhanced cycling stability is attributed to the stabilization of an oxide/oxynitride layer at the VN surface, instead of its dissolution, thanks to the chemical equilibrium shift of the VN dissolution reaction. This simple and innovative strategy consisting in tuning the electrolyte composition opens new pathways for other systems that suffer from electrode dissolution in the electrolyte while being electrochemically cycled.
UR - http://www.scopus.com/inward/record.url?scp=85131764785&partnerID=8YFLogxK
U2 - 10.1149/1945-7111/ac7353
DO - 10.1149/1945-7111/ac7353
M3 - Article
AN - SCOPUS:85131764785
SN - 0013-4651
VL - 169
JO - Journal of the electrochemical society
JF - Journal of the electrochemical society
IS - 6
M1 - 063503
ER -