Publication Date:
2018-08-16
Description:
Nanostructured nickel cobalt sulfide (NiCo 2 S 4 ) electrodes are successfully fabricated using a simple alternate-dip-coating method. The process involves dipping a TiO 2 nanoparticles-covered substrate in a nickel/cobalt precursor solution and sulfur precursor solution alternately at room temperature. The fabricated bimetallic sulfide electrode exhibits a synergetic improvement compensating for the disadvantages of the two single metal sulfide electrodes, i.e. the poor cycle stability of the nickel sulfide electrode and the low specific capacitance ( C sp ) of the cobalt sulfide electrode. The two capacitive properties are optimized by adjusting the ratio of nickel and cobalt concentrations in the metal precursor solution, reaching a C sp of 516 F g –1 at a current density of 1 mA cm –2 , with its retention being 99.9% even after 2000 galvanostatic charge–discharge cycles.
Keywords:
materials science, physical chemistry
Electronic ISSN:
2054-5703
Topics:
Natural Sciences in General
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