▎ 摘　　要

Copper-copper hydroxide-electrochemically reduced graphene oxide (Cu-Cu(OH)(2)/RGO) nanocomposite is formed successfully on stainless steel (SS) in two steps: (i) electrophoretic deposition of nanocomposite film from CuSO4 and graphene oxide (GO) colloidal suspension on SS and (ii) electrochemical reduction of prepared electrode in 0.5 M NaNO3 electrolyte. Cu-Cu(OH)(2)/RGO is characterized by X-ray diffraction, atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM) and energy dispersive X-ray spectrometry. AFM and FESEM images indicate the homogenous distribution of Cu-Cu(OH)(2) nanoparticles on the surface of RGO. The electrochemical properties of Cu-Cu(OH)(2)-RGO/SS are investigated by cyclic voltammetery, galvanostatic charge/discharge technique and electrochemical impedance spectroscopy. Cu-Cu(OH)(2)-RGO/SS exhibits a high capacitance of 333 F g(-1) in 0.5 M Na2SO4 electrolyte which is two times higher than that of RGO/SS (192 F g(-1)) and indicate the positive effect of Cu-Cu(OH)(2) on capacitance of electrode. Also, it is observed that with addition of 0.1 M Fe(CN)(6)(3-/4-) into aqueous solution of 0.5 M Na2SO4, the electrochemical performance of Cu-Cu(OH)(2)-RGO/SS increases substantially and shows a high specific capacitance of 492 F g(-1) at current density of 5 A g(-1), which is higher than that of Cu-Cu(OH)(2)-RGO/SS (333 F g(-1)). A positive effect of the presence of Fe(CN)(6)(3-/4-) in the electrolyte is due to electron relay of Fe(CN)(6)(-3) /Fe(CN)(6)(-4) ion pair at the electrode/electrolyte interface by coupling in the redox transition of Cu(I)/Cu(II). The electrochemical tests indicate that Cu(OH)(2)-RGO/SS in 0.5 M Na2SO4 electrolyte containing 0.1 M Fe(CN)(6) (3-/4-)shows an outstanding cyclic stability with specific retention of 97% after 500 cycles.