Abstract
Here, we developed a new approach to synthesize NiCo2S4 thin films for supercapacitor application using the successive ionic layer adsorption and reaction (SILAR) method on Ni mesh with different molar ratios of Ni and Co precursors. The five different NiCo2S4 electrodes affect the electrochemical performance of the supercapacitor. The NiCo2S4 thin films demonstrate superior supercapacitance performance with a significantly higher specific capacitance of 1427 F g−1 at a scan rate of 20 mV s−1. These results indicate that ternary NiCo2S4 thin films are more effective electrodes compared to binary metal oxides and metal sulfides.
Highlights
These results indicate that ternary NiCo2S4 thin films are more effective electrodes compared to binary metal oxides and metal sulfides
We report the facile synthesis of Ni-Co-S (NCS) flake-like nanostructures on Ni mesh for supercapacitor applications
NiCo2S4 thin films were synthesized by dipping a substrate into aqueous solutions of Ni(NO3)2.6H2O, Co(NO3)2.6H2O, and Na2S.9H2O separately
Summary
Received: 17 June 2019 Accepted: 3 September 2019 Published: xx xx xxxx application with different molar ratio of Ni and Co. We developed a new approach to synthesize NiCo2S4 thin films for supercapacitor application using the successive ionic layer adsorption and reaction (SILAR) method on Ni mesh with different molar ratios of Ni and Co precursors. Though the fabrication of NiCo2S4 nanostructures has been well researched to date, the synthesis of NiCo2S4 with specific hierarchical structures requires further investigation In this sense, the development of Ni-Co-S electrode materials with varying compositions of Ni and Co is crucial to achieve optimal supercapacitor properties, such as high electrical conductivity, a porous structure, large capacitance, and excellent electrochemical stability. The Ni2+/Co2+ deposited flexible Ni mesh was immersed in the Na2S precursor solution where S2− ions from the solution reacts with Ni2+ and Co2+ ions to form mixed metal sulfide film It is rinsed in the DDW for 5 s to remove loosely bound S2− ions. Electrochemical impedance measurements were taken between 1 Hz and 100 kHz with an AC amplitude of 10 mV and a bias potential of 0.4 V
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