Cobalt-based metal oxide coated with ultrathin ALD-MoS 2 as an electrode material for supercapacitors
Chemical Engineering Journal, ISSN: 1385-8947, Vol: 435, Page: 135066
2022
- 35Citations
- 38Captures
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Article Description
A novel approach of preparing a composite supercapacitor electrode consisting of ternary metal oxide nanostructure decorated with transition metal sulfide is presented. High-surface area NiCo 2 O 4 nano-sheets grown on Ni-foam are coated with an ultrathin layer of MoS 2 by atomic layer deposition (ALD) and the hybrid structure reveals superior electrochemical performance. The composite is thoroughly studied with several characterizations like XRD, Raman, XPS, SEM and TEM. A comparative study with MoS 2 coated Co 3 O 4 electrodes not only ensures the advantage of the more conducting sulfide layer in enhancing the supercapacitor performance significantly but also establishes the superiority of the ternary oxide (NiCo 2 O 4 ) for this application. The thinner and well-connected nano-sheets of NiCo 2 O 4 provides the more interface between the electrode and the electrolyte whereas an optimal thickness of MoS 2 helps to maximize the performance of the device. The high areal capacitance (2445 mF cm −2 ), enhanced rate capability of the optimized NiCo 2 O 4 -MoS 2 composite is therefore ascribed to the synergistic effect of high-surface area of the oxide nano-sheets and better electronic conductivity of the sulfide. The current study thus opens a route to combine the conventional hydrothermal synthesis of ternary oxide nanostructures with ALD grown layered transition metal dichalcogenides to achieve a superior electrode for next-generation supercapacitor.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1385894722005721; http://dx.doi.org/10.1016/j.cej.2022.135066; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85124267859&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1385894722005721; https://dx.doi.org/10.1016/j.cej.2022.135066
Elsevier BV
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