Superior Supercapacitor Based on the 3D Architecture of Multilayered Delta-MnO2 Nanosheets Grown on Carbon Nanoparticles

Abstract

The two-dimensional nanostructures are attractive materials for energy storage electrode materials due to extensive intercalation of ions. The two dimensional layered structure with suitable van-der-Waals gap along with multilayered arrangement is favorable to enhance the intercalation of ions. We report an innovative architecture composed of two dimensional multilayer delta-MnO2 nanosheets grown on carbon nanoparticles (CNP) by simple, template-free, low temperature chemical method. The electrochemical kinematics investigation has been done through impedance spectroscopic analysis and scan rate dependent storage mechanism as effect of increasing temperature. The specific capacitance elevated to 321 F.g-1 as temperature improves upto 70oC at 2 mV.s-1 which is almost double increment in the capacitance and four times enhancement in the energy density. However, the stability is compromised only 25% up to 6000 cycles at 5 A.g-1 current density. The temperature increment is boosting ionic conductivity, enlarging the van-der-Waal gap and increasing charge transfer, simultaneously enrich intercalations of Na+ ions that initiate tremendous boost in energy storage. Thus a 3D architecture of multilayerd delta-MnO2 nanosheets exhibits high-temperature superior performance pseudocapacitors with low life spam by compensating which is highly noteworthy.