Figure 2

(a) XRD pattern of as synthesis Cu foil electrode, Cu(OH)₂NWs, CuONWs and CuO NWs with GNP. (b) Low resolution of FESEM image of CuO NWs with GNP. (c) Moderate-resolution of FESEM image of CuO NWs with GNP. (d) High resolution of FESEM image of CuO NWs with GNP.