Facile preparation of Mn3O4/rGO hybrid nanocomposite by sol–gel in situ reduction method with enhanced energy storage performance for supercapacitor applications (original) (raw)
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Inorganic Chemistry Communications, 2020
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Hierarchical Design of rGO-PEDOT- δ-MnO2 Nanocomposite for Supercapacitors
Journal of Electronic Materials, 2019
A hierarchical strategy has been adopted for the development of ternary composites, where nanostructured d-MnO 2 has been fabricated sonochemically on a unique mesoporous binary composite made of 3,4-ethylenedioxythiophene (EDOT) and reduced graphene oxide (rGO) in order to achieve maximum loading of 89% Mn +4 oxidation state essential for high capacitance value. All composite samples have been characterized by transmission electron microscopy, x-ray diffraction, Fourier infrared spectroscopy and thermogravimetry analysis. Oxidation states of manganese have been evaluated by x-ray photoelectron spectroscopy (XPS). The charge storage mechanism in the nanocomposite materials is primarily governed by the unique mesoporous structure developed during oxidative polymerization of the EDOT and rGO in the composites. The cumulative charge accumulation reveals the storage mechanism where, the entrance of Li + ion into the mesoporous layered structure of rGO based nanocomposites during reduction followed by re-entrance of Li + ion on oxidation, is comparable to that of Li + ion adsorption/ desorption on the surface of the nanocomposites. Impedance measurements are carried out to evaluate the contribution of the pseudocapacitance over the electrical double layer capacitance. Achievement of high specific capacitance (345 F g À1) with small attenuation ($ 12%) over 1000 continuous charging/ discharging cycles, suggests that the ternary nanocomposites with 70% loading of d-MnO 2 (RGPT70M) acts as a promising candidate for the electrode materials of the supercapacitor.
Crystals
In this work, the chemical bath deposition (CBD) technique was utilized in the synthesis of transition metals/GO nanocomposites (Co3O4/MnO2/NiO/GO) for applications in supercapacitor electrodes. The nanocomposites after characterization showed that the electrically conductive nature and wide surface area of graphene oxide (GO) accounted for its incorporation into the nanocomposites. The synergy between the nanocomposites accounts for their improved performance and stable phase. The XRD results revealed cubic, orthorhombic, cubic, and mixed phases for the Co3O4/GO (CG), MnO2/GO (MG), NiO/GO (NG), and Co3O4/MnO2/NiO/GO (CMNG), respectively; their morphologies showed platelet nanoparticles with few agglomerates, with an average particle size of 69 ± 12 nm, 37 ± 09 nm, 58 ± 36 nm, and 36 ± 08 nm, respectively. For the produced materials, electrochemical results revealed maximum specific capacitance values of 2482 F/g from cyclic voltammograms and 1280.48 F/g from the galvanometric test....
Synthesis of NiMoO4/3D-rGO Nanocomposite in Alkaline Environments for Supercapacitor Electrodes
Crystals
Although Graphene oxide (GO)-based materials is known as a favorable candidate for supercapacitors, its conductivity needs to be increased. Therefore, this study aimed to investigate the performance of GO-based supercapicitor with new methods. In this work, an ammonia solution has been used to remove the oxygen functional groups of GO. In addition, a facile precipitation method was performed to synthesis a NiMoO4/3D-rGO electrode with purpose of using synergistic effects of rGO conductivity properties as well as NiMoO4 pseudocapacitive behavior. The phase structure, chemical bands and morphology of the synthesized powders were investigated by X-ray diffraction (XRD), Raman spectroscopy, and field emission secondary electron microscopy (FE-SEM). The electrochemical results showed that the NiMoO4/3D-rGO(II) electrode, where ammonia has been used during the synthesis, has a capacitive performance of 932 Fg−1. This is higher capacitance than NiMoO4/3D-rGO(I) without using ammonia. Furth...
Electrochimica Acta, 2013
In this study, we have improved the capacitance of carbon based graphene oxide (GO) and metal oxide based manganese oxide (Mn 3 O 4 ) thin films by preparing thin films of GO/Mn 3 O 4 composite using simple and inexpensive successive ionic layer adsorption and reaction (SILAR) method. These prepared films are characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDAX) and BET techniques. The XRD analysis reveals the formation of GO, Mn 3 O 4 and GO/Mn 3 O 4 composite thin films and the FTIR studies disclose the characteristic chemical bonding between the respective materials. Furthermore, Raman measurements confirm the formation of GO and GO/Mn 3 O 4 composite thin films. The SEM images demonstrate that the surface structure of GO and Mn 3 O 4 thin films can be easily tuned by forming the composite of GO and Mn 3 O 4 materials leading to excellent processability of a system. The surface area of GO/Mn 3 O 4 composite (94 m 2 g −1 ) is measured by using Brunauer-Emmett-Teller (BET) technique. The supercapacitive behaviors of different electrodes are evaluated using cyclic voltammetry (CV) and galvanostatic charge-discharge techniques in 1 M Na 2 SO 4 . The specific capacitance of 344 F g −1 is achieved for GO/Mn 3 O 4 composite electrode at a scan rate of 5 mV s −1 . In addition, impedance measurements of the GO, Mn 3 O 4 and GO/Mn 3 O 4 electrodes are executed proposing that the GO/Mn 3 O 4 composite electrodes are promising materials for supercapacitor application.
Batteries
This paper presents research on the synergistic effects of nickel molybdate and reduced graphene oxide as a nanocomposite for further development of energy storage systems. An enhancement in the electrochemical performance of supercapacitor electrodes occurs by synthesizing highly porous structures and achieving more surface area. In this work, a chemical precipitation technique was used to synthesize the NiMoO4/3D-rGO nanocomposite in a starch media. Starch was used to develop the porosities of the nanostructure. A temperature of 350 °C was applied to transform graphene oxide sheets to reduced graphene oxide and remove the starch to obtain the NiMoO4/3D-rGO nanocomposite with porous structure. The X-ray diffraction pattern of the NiMoO4 nano particles indicated a monoclinic structure. Also, the scanning electron microscope observation showed that the NiMoO4 NPs were dispersed across the rGO sheets. The electrochemical results of the NiMoO4/3D-rGO electrode revealed that the incorpo...
International Journal of Scientific Research in Science and Technology, 2021
Mn3O4 and its composite nanomaterials have become promising candidate as an electrode for supercapacitor devices, because of its low cost, non-toxicity, large abundance, high porosity and high capacitance values in aqueous electrolyte. Here, we systematically summarized the impact of different morphologies of Mn3O4 and its composite nanomaterials on supercapacitive performance. Many researchers synthesized various Mn3O4 and its composite nanomaterials of exceptional properties and different morphologies for energy storage. This article reviews recent efforts and developments in synthesis methods Mn3O4 and its composite nanomaterials as an electrode material in supercapacitor.
IRJET-SYNTHESIS AND CHARACTERIZATION OF MnO2/rGO NANOCOMPOSITE FOR SUPERCAPACITORS
– In this paper we present a general approach for the preparation of rGO/MnO2 nanocomposite. The Graphene oxide is produced by Modified Hummer’s method and it gets reduced to get rGO. The MnO2 nanoparticles were prepared by drop-feeding method and these MnO2 is mixed with rGO in order to form nanocomposite. Then the samples are characterized by UV, FTIR, XRD, SEM and Cyclic Voltammetry. XRD peaks reveal the particle size of the MnO2 nanoparticles and rGO/MnO2. U-V Spectroscopy spectrum shows the absorbance for MnO2 nanoparticles. FTIR confirms the presence of respective functional groups. Then SEM images indicate structure for the prepared samples. From the CV curve specific capacitance is calculated & high capacitance value found to be 678 F/g value at san rate 5 mVs-1.
Research Square (Research Square), 2023
Supercapacitor is an alternative for the conventional battery source owing to the safety, electrochemical stability, high power density, short charging time and long cycle life. In this view, MnO2 as an electrode material was synthesized via electrodeposition method to produce MnO2 thin lms on stainless steel substrates as an electrochemical supercapacitors. The various characterization techniques were employed to study their physico-chemical properties. The scanning electron microscopy reveals interconnected nanowalls-like morphology of MnO2 thin lms, which offers a higher surface area. As a function of the surface morphology, the synthesized MnO2 thin lm-based capacitor showed highest speci c capacitance of 464.45 Fg-1 at a low scan rate of 10mV.s-1 and galvonostatics charge discharge speci c capacitance of 284.05 Fg-1 for current density of 1mA/cm2. In addition, the MnO2 based supercapacitor has also shown the higher cyclic stability at about 98% even after 500 cyclic voltammetry test.