Publication date: 14th September 2021
ABSTRACT
A one-step synthesis of sheet-like RuS2 nanoarchitectures exhibiting traits of a potential cathode material for designing high-performance asymmetric supercapacitors (ASCs) is demonstrated. The synthesis includes direct sulfurization of RuO2 in an inert atmosphere at high temperature that results in densely packed nanosheets of RuS2 with moderate surface area. Such a structure provides abundant sites for surface or near-surface based faradaic/non-faradaic reactions for energy storage while facilitating ion migration during charge/discharge processes. Benefitted from these traits, RuS2 electrode exhibits substantially enhanced capacitive performance as compared to the RuO2 electrode. Detailed analyses suggest that the charge storage in such RuS2 nanosheets is governed by capacitive as well as diffusion-controlled processes at lower scan rates but is dominated by capacitive processes at higher scan rates. The assembled activated carbon//RuS2 ASC with an optimum cell voltage of 2V in aqueous electrolyte exhibits attractive energy-power combination with excellent cycling performance, which outperforms many other recently reported ASCs.
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