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Abstract : Carbon nanotubes (CNTs) were directly synthesized on a copper (Cu) plate as a current collector
by the catalytic thermal vapor deposition method for an electric double-layer capacitor (EDLC) electrode. The
diameters of vertically aligned CNTs grown on the Cu plate were 20~30 nm. From cyclic voltammetry (CV)
results, the CNTs/Cu electrode showed high specific capacitance with typical profiles of EDLCs. Rectangularshaped CV curves suggested that the CNTs/Cu electrode could be an excellent candidate for an EDLC
electrode. The specific capacitances were in a range of 25~75 F/g with a scan rate of 10~100 mV/s and KOH
electrolyte concentration 1~6 M, and were maintained up to 1000 charge/discharge cycles due to strong
adhesion between the Cu substrate and the CNTs.
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