Jana, Milan Kumar, J. Sharath Khanra, Partha Samanta, Pranab Koo, Hyeyoung Murmu, Naresh Chandra Kuila, Tapas 2024-01-20T05:03:05Z 2024-01-20T05:03:05Z 2021-09-05 2016-01-30 0378-7753 https://pubs.kist.re.kr/handle/201004/124488 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 (similar to 1056 S m(-1)), good surface area (59 m(2) g(-1)) and high pore volume (0.3 cm(3) g(-1)). The specific capacitance (SC) of the MRGO composite is similar to 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 similar to 318 F g(-1) (at 2 A g(-1)) and energy density of similar to 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 similar to 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. (C) 2015 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV HYDROTHERMAL SYNTHESIS NANOSHEETS ENERGY GRAPHITE FABRICATION COMPOSITES REDUCTION NANOCOMPOSITES INTERCALATION NANOPARTICLES Superior performance of asymmetric supercapacitor based on reduced graphene oxide-manganese carbonate as positive and sono-chemically reduced graphene oxide as negative electrode materials Article 10.1016/j.jpowsour.2015.10.107 1 JOURNAL OF POWER SOURCES, v.303, pp.222 - 233 JOURNAL OF POWER SOURCES 303 222 233 scie scopus 000370463400028 2-s2.0-84946854905 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article HYDROTHERMAL SYNTHESIS NANOSHEETS ENERGY GRAPHITE FABRICATION COMPOSITES REDUCTION NANOCOMPOSITES INTERCALATION NANOPARTICLES Manganese carbonate Reduced graphene oxide Sono-chemical reaction Supercapacitor Asymmetric device