Title :

Tuning Deposition Conditions for VN Thin Films Electrodes for Microsupercapacitors: Influence of the Thickness

Author(s) :

Lebreton, Allan [Auteur]
Institut des Matériaux de Nantes Jean Rouxel [IMN]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Barbé, Jérémy [Auteur]
Institut des Matériaux de Nantes Jean Rouxel [IMN]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Lethien, Christophe [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Institut universitaire de France [IUF]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Coleman, Jonathan [Auteur]
Trinity College Dublin
Brousse, Thierry [Auteur]
Institut des Matériaux de Nantes Jean Rouxel [IMN]
Réseau sur le stockage électrochimique de l'énergie [RS2E]

Journal title :

Journal of The Electrochemical Society

Pages :

090513

Publisher :

Electrochemical Society

Publication date :

2024-09-11

ISSN :

0013-4651

English keyword(s) :

energy storage
vanadium nitride
sputtering
supercapacitors
thin film growth
pseudocapacitance

HAL domain(s) :

Chimie/Matériaux

English abstract : [en]

Vanadium nitride is a highly promising material for micro-pseudocapacitors when used as a bifunctional thin film, i.e. an electrode material and a current collector, owing to its remarkable electrical and electrochemical ...
Show more >Vanadium nitride is a highly promising material for micro-pseudocapacitors when used as a bifunctional thin film, i.e. an electrode material and a current collector, owing to its remarkable electrical and electrochemical properties. However, the specific limitations associated with high-rate cycling remain unclear. In this study, we evaluate how the characteristic time associated with charge/discharge of vanadium nitride films is modified with the film thicknesses using electrochemical impedance spectroscopy and cyclic voltammetry measurements coupled to a semi-empirical model commonly utilized to assess the high-rate behaviour of battery electrodes. Both methodologies are in good agreement and revealed that rate capability of this bi-functional material is limited by the VN electrical conductivity. To confirm this finding, VN thin films were sputtered on platinum current collectors, leading to a six-fold reduction in the characteristic time associated with charge/discharge of the current collectors/electrode material. This underscores the importance of using current collectors even for highly conductive electrode materials.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Laboratory of excellency for electrochemical energy storage

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL