High resolution electrochemical micro-capacitors based on oxidized multi-walled carbon nanotubes

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Dinh, T.M.^1 ; Pech, D.^1 ; Brunet, M.^1 ; Achour, A.^1

Laboratoire d'Analyse et d'Architecture des Systèmes, LAAS-CNRS, 7 av du Colonel Roche, 31077 Toulouse Cedex 4, France^1

关键词: Aqueous suspensions;    Double-layer capacitance;    Electrode configurations;    Electrophoretic deposition techniques;    High power density;    Micro supercapacitors;    Pseudo capacitances;    Specific capacitance;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012106/pdf
DOI  :  10.1088/1742-6596/476/1/012106

来源: IOP

【 摘 要 】

This study reports the preparation of all-solid-state micro-supercapacitors in planar interdigitated configuration based on MWCNTs via the electrophoretic deposition technique. The carbon nanotubes were functionalized with carboxylic groups via a HNO3concentric solution in order to prevent their agglomeration and obtain a stable aqueous suspension, and to add a pseudo-capacitance contribution to the predominant double-layer capacitance. The electrode materials were characterized in a 3 electrode configuration, and the micro-devices in a two-electrode configuration using electrochemical impedance spectroscopy and cyclic voltammetry in 0.5 M sulfuric acid and a gel of PVA-H3PO4-H2O doped by SiWA electrolyte. Spatial resolution down to 10 μm was obtained for the device with specific capacitance up to 1.8 mF.cm-2in electrolyte based PVA and a high power density of 1.28 W.cm-2in 0.5 M H2SO4electrolyte.