series of uniform composite networks consisting of CuO nanosheets (NSs)/single-wall carbon nanotubes (SWCNT) were fabricated through a facile and green method with the aid of electrostatic interaction in aqueous solution. The capacitance was investigated by using various electrochemical methods including cyclic voltammetry (CV), constant-current galvanostatic charge/discharge curves, and electrochemical impedance spectroscopy. The CuO NSs/SWCNT networks show better specific capacitance (137.6 F g(-1)) by CV at a scan rate of 2 mV/s compared to 71.0 F g(-1) of CuO NSs, and 25.3 Fg(-1) of SWCNT. The CuO NSs/SWCNT electrodes exhibit good cycling stability with effective specific capacitance of 59.3 Fg(-1) after 1000 cycles in a 6M KOH aqueous solution at a current density of 5 Ag-1, which is over two times as 25.1 Fg(-1) of CuO NSs electrodes. CuO nanowires/SWCNT interpenetrating networks were also successfully prepared, demonstrating a significant improvement of specific capacitance as well as cycling stability. It is obvious that the homogenous dispersion of SWCNT in CuO NSs solution remarkably improves their electrochemical performance. (C) 2013 Elsevier Ltd. All rights reserved.