Jana, Milan and Kumar, J. Sharath and Khanra, Partha and Samanta, Pranab and Koo, Hyeyoung and Murmu, Naresh Chandra and Kuila, Tapas (2016) Superior performance of asymmetric supercapacitor based on reduced graphene oxide–manganese carbonate as positive and sono-chemically reduced graphene oxide as negative electrode materials. Journal of Power Sources, 303. pp. 222-233.

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A novel strategy to synthesize hierarchical rod like MnCO3 on the reduced graphene oxide (RGO) sheets by a facile and cost-effective hydrothermal method is demonstrated. The chelating action of citric acid facilitates the formation a complex intermediate of Mn2+ and citrate ions, which finally results a 3D MnCO3/RGO (MRGO) composite with high electrical conductivity (∼1056 S m−1), good surface area (59 m2 g−1) and high pore volume (0.3 cm3 g−1). The specific capacitance (SC) of the MRGO composite is ∼1120 F g−1 at a current density of 2 A g−1 in three electrode system. An asymmetric device has been designed with MRGO as positive and sono-chemically reduced RGO (SRGO) as negative electrode material. The asymmetric device (MRGO//SRGO) shows the SC of ∼318 F g−1 (at 2 A g−1) and energy density of ∼113 W h kg−1 (at 1600 W kg−1). The true energy density (1.7 W h kg−1) has been calculated considering the total weight of the device. The MRGO//SRGO device can power a wall clock for ∼13 min after full charging. The Nyquist plot of the asymmetric cell has been simulated with Z-View software to measure the solution resistance, charge-transfer resistance and Warburg elements.

Item Type: Article
Subjects: Supercapacitor
Depositing User: Dr. Sarita Ghosh
Date Deposited: 11 Jul 2017 05:36
Last Modified: 11 Jul 2017 05:36
URI: http://cmeri.csircentral.net/id/eprint/423

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