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¡¡¡¡XRD of samples was performed on a diffractometer (D/Max-2400) with Cu K¦Á radiation (=1.5418 Å at 40 kV, 60 mA. Morphology of the ZnO-graphene composites was investigated with FESEM (JSM-6701F, Japan). TEM image was taken with a transmission electron microscope (JEOL, JEM-2010, Japan) operating at 200 kV. The N2 adsorption¨Cdesorption isotherms of the samples were measured at 77 K using Quantachrome Instruments (version 2.02) in order to determine the specific surface areas. The components omaterials were measured by a Nicolet Nexus 670 FT-IR instrument. Thermal analysis was carried out using a Perkin-Elmer TG/DTG¨C6300 instrument in a temperature range of 30¨C750 ¡æ. A heating rate of 10 ¡æ min¨C1 in air with a flow rate of 20 mL min-1 was used. A typical three-electrode test cell in 0.1M Na2SO4 electrolyte at room temperature was used for cyclic voltammograms (CV), galvanostatic charge¨Cdischarge tests and electrochemical impedance spectroscopy (EIS), using a CHI660B (CH Instrument) electrochemical working station. The prepared electrode was used as the working electrode. A platinum foil served as the counter electrode and standard calomel electrode (SCE) as the reference electrode.

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