Electrochemical double layer capacitors (EDLCs) have emerged as a promising solution for applications requiring durable and reliable devices with high power and energy density.(l, 2) EDLCs offer comparable power densities to electrolytic capacitors while providing 2 to 3 orders of magnitude increase in energy density, thus allowing them to complement or serve as possible replacements for existing batteries.(3) The unique properties of carbon nanotubes (CNTs) such as high electrical conductivity, electrochemical, mechanical and chemical stability, high surface area and low mass density, make them suitable candidates for EDLC electrodes.(4) Vertically aligned arrays of multi-walled CNTs (VACNTs) have been considered for use in EDLCs due to their facile synthesis and the ability to control the ion-accessible surface;(5)(6) however, continuous synthesis methods to prepare VACNTs directly on current collectors (e.g., Al foil) at relatively low costs are needed for commercially viable EDLCs.
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