Layer-by-Layer Cathodic Deposition of Ni/Ni(OH)2 Particles on Steel Gauze Electrode for High-Performance Supercapacitor Application

Layer-by-layer of Ni/Ni(OH)(2) particles were deposited on Steel Gauze (SG) electrode via cathodic electrodeposition. The system with two electrodes was selected for electrodeposition in the galvanostatic condition. Electrodeposition of the first layer of Nickel was conducted in the electrochemical cell with an SG substrate as a cathode. This electrode was fixed between two parallel graphite anodes and electrodeposition was performed from a mixture of NiCl2, NH4Cl, NaCl solution. Electrodeposition of the second layer of Ni(OH)(2) on the Ni layer which has been formed in the first step, was carried out in the same way from a solution containing Ni(NO3)(2). TG, XRD and SEM techniques were used for the characterization of the prepared SG/Ni/Ni(OH)(2) electrode. The prepared SG/Ni/Ni(OH)(2) electrode was analyzed by electrochemical techniques such as Cyclic Voltammetry (CV), galvanostatic charge-discharge and Electrochemical Impedance Spectroscopy (EIS). The SG/Ni/Ni(OH)(2) electrode demonstrated high specific capacity (1308 C g(-1) at the scan rate of 5 mV s(-1)) and excellent cycling ability (8.9% capacity decay at the current density of 50 A g(-1) after 1000 cycle).