Thermal Effects on Electrochemical Performance of Copper Oxide Nanoparticles Decorated Amine-Functionalized Graphene Oxide for Ultrahigh Energy Density Supercapacitor with Real-Life Application
Bhuman Gangopadhyay, Amit Mallik, Mir Sahanur Ali, Ashis Halder, Rashbihari Layek, Devdas Karmakar, Srikanta Karmakar, Koushik Dutta, T. D. Das, Subrata Panda, Pathik Kumbhakar, Dipankar Chattopadhyay
Abstract
The article describes the synthesis of copper oxide decorated amine functionalized graphene oxide (AGO) composites at four different temperatures, i.e., 50, 85, 120, and 155 °C. The process involves the generation of AGO by chemical functionalization and using −NH 2 groups to anchor Cu 2+ ions via coordinate bonds. Reduction of Cu 2+ results in Cu + on the surface of AGO, which is confirmed by XRD and TEM. The surface composition and amine functionalization of nanocomposites were confirmed by XPS and FTIR analyses. The dielectric measurements display a decrease in dielectric constant with an increase in frequency, for all nanocomposites, signifying better capacitive behavior owing to better polarization. AGC85 displays ultrahigh specific capacitance and energy density values of ∼3890 F/g and 540.71 Wh·kg –1 at 2.0 A/g current density. Interestingly, after 10000 cycles, AGC85 shows excellent capacitance retention of about 85.6%. A solid state supercapacitor device was fabricated with AGC85 (active material), which can supply power for running an LED bulb for 60 min prior to a few minutes of charging. The low-temperature synthesized copper nanoparticle intercalated on amine-functionalized graphene oxide can be scaled up and used in high-performance supercapacitors for real-life applications in energy systems.