Major Improvement in the Cycling Ability of Pseudocapacitive Vanadium Nitride Films for Micro‐Supercapacitor
Source abstract
Abstract
Abstract Vanadium nitride film made using a thin film deposition technique is a promising electrode material for micro‐supercapacitor applications owing to its high electrical conductivity and high volumetric and surface capacitance values in aqueous electrolyte. Nevertheless, the cycling stability has to be improved to deliver good capacitance during a large number of cycles. Here, it is shown that vanadium nitride films made by a magnetron sputtering deposition method exhibit remarkable cycling stability (high capacitance retention value after 150 000 cycles), ultra‐high rate capability (75% of the initial capacitance at 1.6 V s−1), while providing high surface capacitance values (≈1.4 F cm−2) and very low ageing of the VN electrodes (no loss of performance after 13 months). Additionally, new findings regarding the location of vanadium oxides species responsible for the charge storage mechanism in pseudocapacitive VN films are revealed by transmission electron microscopy electron energy‐loss spectroscopy analyses at the nanoscale.
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Research context
OpenAlex topics: Supercapacitor Materials and Fabrication · MXene and MAX Phase Materials · Advancements in Battery Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Institut d'Electronique de Microélectronique et de Nanotechnologies Université de Lille CNRS Université Polytechnique Hauts‐de‐France UMR 8520—IEMN Lille F‐59000 France
Unité de Catalyse et de Chimie du Solide (UCCS) Université de Lille CNRS Centrale Lille Université d'Artois UMR 8181—UCCS Lille F‐59000 France
Réseau sur le Stockage Electrochimique de l'Energie (RS2E) CNRS FR 3459, 33 rue Saint Leu Amiens Cedex 80039 France
Unité Matériaux et Transformations Université de Lille CNRS UMR 8207 Lille France
Université de Lille CNRS INRAE Centrale Lille IMEC—Institut Michel‐Eugène Chevreul Université d'Artois, FR 2638 Lille F‐59000 France
Nantes Université CNRS Institut des Matériaux de Nantes Jean Rouxel IMN Nantes F‐44000 France
Institut Universitaire de France (IUF) Saint‐Michel 103 Paris 75005 France
Funding
Agence Nationale de la Recherche
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