A Binder-Free Hybrid of CuO-Microspheres and rGO Nanosheets as an Alternative Material for Next Generation Energy Storage Application

Abstract

Herein, a facile and effective ultrasonication assisted approach has been employed to integrate hydrothermally produced CuO microspheres (CMS) with chemically synthesized reduced graphene oxide conducting nanosheets (CRGO), yielding a new composite material (CSCO). The synthesized materials have been probed by various characterization techniques. The electrochemical performance of all the materials are thoroughly studied by cyclic voltammetry (CV), galvanostatic charging‐discharging (GCD) and electrochemical impedance spectroscopy (EIS) techniques. At a current density of 0.125 A g−1, CSCO demonstrates an excellent specific capacitance of 244 F g−1 (more than six times higher than CMS and CRGO) and the maximum energy and power density values of 8.47 Wh kg−1 and 73.49 W kg−1, respectively. Additionally, it exhibits high rate performance (retains 82.78 % of its initial capacitance even at a high current density of 0.5 A g−1) and long cycle life (∼ 90 % up to 1000 cycles), confirming the robustness and high stability of the composite on the electrode surface. The superior electrochemical performance can be attributed to the positive synergistic effects between CMS and CRGO, providing mechanical robustness and short diffusion path for charge transfer, leading to high conductivity. Distinguishing features such as being binder‐free, ease of preparation, high energy and power density, make CSCO a potential candidate for high performance supercapacitors.

Rosette-like MoS2 nanoflowers as highly active and stable electrodes for hydrogen evolution reactions and supercapacitors

“…4a shows the CV curves at different scan rates, ranging from 10 to 800 mV s À1 . Obviously, all the CV curves display an irregular rectangular shape with a little reduction peak, proving the presence of a double-layer capacitor (EDLC) 51 along with a pseudocapacitive and irreversible faradaic reactions. In addition, the area under the CV curves increases with the increasing of scan rate, 52 and the estimated area specic capacitance (C A ) values in Fig.…”

Iodine‐Doped Graphene with Opportune Interlayer Spacing as Superior Anode Materials for High‐Performance Lithium‐Ion Batteries

“…With the ever‐increasing global pollution and consumption of fossil fuels, lithium‐ion batteries (LIBs) with high energy and power densities have been regarded as a high performance and sustainable energy storage device to meet the needs of social development for hybrid electric vehicles (HEVs), plug‐in HEVs and electric vehicles (EVs) . As the anode materials of LIBs, although metal sulfides and oxides exhibit high specific capacity, they own low‐cyclic life resulting from the volume expansion and pulverization in the process of discharging and charging, which severely impede their commercial applications in the electrochemical storage devices ,.…”

Microwave assisted fabrication of a nanostructured reduced graphene oxide (rGO)/Fe2O3 composite as a promising next generation energy storage material

“…graphite oxide was vacuum dried and collected. 11,39 Later on, 300 mg graphite oxide was rst dispersed in DI water and then sonicated for 1 h to transform it into graphene oxide (GO). The reduction of graphene oxide was carried out by dissolving 3 g NaBH 4 in 18 mL DI water, further gradually added into the GO dispersion and then reuxed at 100 C for 24 h under continuous stirring.…”