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Published in:
23-04-2019
Layer-by-layer electrodeposition of high-capacitance nickel–cobalt oxides on FTO substrate
Published in: Journal of Materials Science: Materials in Electronics | Issue 11/2019
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Abstract
In this work, we have obtained nickel–cobalt oxide coatings by a simple two-step synthesis including electrochemical deposition and thermal treatment at 473 K, 573 K and 673 K in air atmosphere. Electrodeposition was carried out by varying the potential at the same time intervals and using one electrolyte bath containing nickel and cobalt salts. A glass tray with a fluorine-doped tin oxide coating was chosen as a chemically inert and high-temperature resistant substrate. Structural analysis by X-ray diffraction confirmed the formation of spinel-type nickel cobaltite NiCo2O4. The influence of annealing temperature on the pseudocapacitive performance of the films has been investigated using cyclic voltammetry and galvanostatic charge–discharge techniques in 0.1 M NaOH. NiCo2O4 nanostructures exhibited good electrochemical performance with high specific capacitance of 1332 F g−1 at 1 A g−1, and excellent cycle stability with 95% retention of SC after 500 charge–discharge cycles.