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A hydrothermal reaction combined with a post anion-exchange reaction of hierarchically nanostructured NiCo2S4 for high-performance QDSSCs and supercapacitors

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Abstract

This paper proposes a novel and facile strategy to synthesize hierarchical nanostructured NiCo2S4 via a simple hydrothermal reaction combined with a post anion-exchange reaction that was used directly as an electrode in supercapacitor and quantum-dot sensitized solar cells. By applying the appropriate material concentration, deposition temperature, and time, the NiCo2S4 was densely deposited over the entire surface of the Ni foam with good adhesion. The NiCo2S4 electrode exhibited outstanding electrochemical performance in both the applications with a high specific capacitance of 1612.95 F g−1, energy density of 56 W h kg−1 at 5 A g−1, good cycling stability, power conversion efficiency of 3.94%, and Jsc of 12.27 mA cm−2. The NiCo2S4 electrode exhibited almost double the output values compared to NiCo2O4 (693.6 F g−1 at 6.66 A g−1 and efficiency of 1.81%) and NiCo2Se (1401.4 F g−1 at 10 A g−1 and efficiency of 3.86%), resulting from the excellent electrochemical performance of the NiCo2S4. Overall the excellent performance of the fabricated electrode was attributed mainly to the highly electrocatalytic activity, large surface area and decent conductivity of the hierarchical nanostructures of the NiCo2S4. This study shows that the NiCo2S4 nanostructures can be applied not only in high energy density fields, but also in high power density and energy harvesting applications.

Graphical abstract: A hydrothermal reaction combined with a post anion-exchange reaction of hierarchically nanostructured NiCo2S4 for high-performance QDSSCs and supercapacitors

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Publication details

The article was received on 03 Jul 2017, accepted on 07 Aug 2017 and first published on 08 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ02379K
Citation: New J. Chem., 2017, Advance Article
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    A hydrothermal reaction combined with a post anion-exchange reaction of hierarchically nanostructured NiCo2S4 for high-performance QDSSCs and supercapacitors

    S. S. Rao, I. K. Durga, N. Kundakarla, D. Punnoose, C. V. V. M. Gopi, A. E. Reddy, M. Jagadeesh and H. Kim, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ02379K

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