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

被引:0
|
作者
Lebreton, Allan [1 ,2 ]
Barbe, Jeremy [1 ,2 ]
Lethien, Christophe [2 ,3 ,4 ]
Coleman, Jonathan N. [5 ,6 ]
Brousse, Thierry [1 ,2 ]
机构
[1] Nantes Univ, Inst Mat Nantes Jean Rouxel IMN, CNRS, F-44000 Nantes, France
[2] CNRS FR 3459, Reseau Stockage Electrochim Energie RS2E, F-80039 Amiens, France
[3] Univ Lille, Univ Polytechn Hauts De France, Inst Elect Microelect & Nanotechnol, UMR 8520,IEMN, F-59000 Lille, France
[4] Inst Univ France IUF, St Michel 103, F-75005 Paris, France
[5] Trinity Coll Dublin, CRANN Res Ctr, Sch Phys, Dublin 2, Ireland
[6] Trinity Coll Dublin, AMBER Res Ctr, Sch Phys, Dublin 2, Ireland
关键词
supercapacitors; thin film growth; pseudocapacitance; energy storage; vanadium nitride; sputtering; VANADIUM NITRIDE; PERFORMANCE;
D O I
10.1149/1945-7111/ad75be
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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.
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页数:8
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