Abstract
As the global concerns in the development of human civilization, the scientific and technological issues of energy utilization and environment protection are currently facing challenges. Nowadays, enormous energy demands of the world are mainly met by the non-renewable and environmental unfriendly fossil fuels. To replace the conventional energy platform, a pursuit of renewable and clean energy sources and carriers, including hydrogen storage, lithium batteries, and supercapacitors. Electrochemical capacitors, also called supercapacitors, store energy using either ion adsorption (electrochemical double layer capacitors) or fast surface redox reactions (pseudo-capacitors). They can complement or replace batteries in electrical energy storage and harvesting applications, when high power delivery or uptake is needed. A notable improvement in performance has been achieved through recent advances in understanding charge storage mechanisms and the development of advanced nanostructured materials. Herein, we report novel RGO-ZnWO<sub>4</sub>-Fe<sub>3</sub>O<sub>4</sub> electrodes material can be synthesized using one step microwave irradiation technique and reported as an electrode material for supercapacitors applications. The surface morphology, chemical composition and electronic structure of the RGO-ZnWO<sub>4</sub>-Fe<sub>3</sub>O<sub>4</sub> electrodes were characterized using X-ray diffraction (XRD), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performance of the RGO-ZnWO<sub>4</sub>-Fe<sub>3</sub>O<sub>4</sub> electrodes has been investigated using cyclic voltammetry (CV) techniques. The result reveals that a specific capacitance of 480 F/g, an energy density of 15 Wh/kg and power density of 1719.5 W/kg is observed over RGO-ZnWO<sub>4</sub>-Fe<sub>3</sub>O<sub>4</sub> electrodes materials. The cost effective electrodes materials of RGO-ZnWO<sub>4</sub>-Fe<sub>3</sub>O<sub>4</sub> can be useful for future electrochemical energy storage device applications.
Highlights
In recent years, researchers are developing advanced nanostructured materials for energy conversion and storage devices for example battery and supercapacitors
The crystalline nature, surface morphology and chemical compositions of the as-synthesized nanocomposites was examined by the X-ray diffraction (XRD, Rigaku, Japan), transmission electron microscope (TEM, JEM 200CX, JEOL, Japan) and X-ray photoelectron spectroscopy (XPS, MultiLab2000, Thermo VG Scientific System, UK)
The Xray diffraction (XRD) pattern shows ZnWO4 (JCPDS File No 15-0774) and Fe3O4 (JCPDS File No 19-0629) and there is no obvious diffraction peak of RGO at about 23° is not detected within the XRD patterns of RGO-ZnWO4-Fe3O4 composite, indicating that significant formation of RGOZnWO4-Fe3O4 composite face-to-face stacking is absent due to the introduction of ZnWO4 and Fe3O4 on both sides of RGO sheets
Summary
Researchers are developing advanced nanostructured materials for energy conversion and storage devices for example battery and supercapacitors. Supercapacitors are expanding mind blowing specific and mechanical thought due to their promising applications in auto and flexible electronic frameworks including electric vehicles, memory devices, microelectromechanical systems, digital cameras, mobile phones, and pacemakers [3, 4]. Low abundance and high cost hindered their current era. To solve these problems, we have to develop a high-performance energy storage material by using a simple and cost efficient method. An electrochemical property of the RGO-ZnWO4-Fe3O4 was carried out and the result reveals that the as-prepared RGOZnWO4-Fe3O4 is the promising candidate which can act as an electrode material for supercapacitor applications
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