Microwave-Assisted Synthesis of Graphene Oxide-MnO2 Composites for Supercapacitors

Graphene oxide-MnO2 (GO-MnO2) was successfully synthesized by microwave-assisted method with the substrate of GO covered by MnO2. MnO2 contained disordered pore structure and aggregate of random shape. GO exhibited layer-like shape and had a large numbers of functional groups on its surface. The electrochemical measurements were employed by cyclic voltammetry (CV) and galvanostatic charge/discharge (GCD), the results showed that the GO-MnO2 composite had good capacitive performance, the maximum of specific capacitance was 127 F g-1 at the current density of 100 mA g-1.

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Synthesis of Carbon-Supported MnO2 Nanocomposites for Supercapacitors Application

Crystals ◽

10.3390/cryst11070784 ◽

2021 ◽

Vol 11 (7) ◽

pp. 784

Author(s):

Jolita Jablonskiene ◽

Dijana Simkunaite ◽

Jurate Vaiciuniene ◽

Giedrius Stalnionis ◽

Audrius Drabavicius ◽

...

Keyword(s):

Electron Microscopy ◽

Cyclic Voltammetry ◽

Specific Capacitance ◽

Carbon Powder ◽

Microwave Assisted Synthesis ◽

Electrochemical Characteristics ◽

Galvanostatic Charge ◽

Microwave Assisted ◽

Step Procedure ◽

Charge Discharge

In this study, carbon-supported MnO2 nanocomposites have been prepared using the microwave-assisted heating method followed by two different approaches. The MnO2/C nanocomposite, labeled as sample S1, was prepared directly by the microwave-assisted synthesis of mixed KMnO4 and carbon powder components. Meanwhile, the other MnO2/C nanocomposite sample labeled as S2 was prepared indirectly via a two-step procedure that involves the microwave-assisted synthesis of mixed KMnO4 and MnSO4 components to generate MnO2 and subsequent secondary microwave heating of synthesized MnO2 species coupled with graphite powder. Field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma optical emission spectroscopy have been used for characterization of MnO2/C nanocomposites morphology, structure, and composition. The electrochemical performance of nanocomposites has been investigated using cyclic voltammetry and galvanostatic charge/discharge measurements in a 1 M Na2SO4 solution. The MnO2/C nanocomposite, prepared indirectly via a two-step procedure, displays substantially enhanced electrochemical characteristics. The high specific capacitance of 980.7 F g−1 has been achieved from cyclic voltammetry measurements, whereas specific capacitance of 949.3 F g−1 at 1 A g−1 has been obtained from galvanostatic charge/discharge test for sample S2. In addition, the specific capacitance retention was 93% after 100 cycles at 20 A g−1, indicating good electrochemical stability.

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Fast and facile microwave-assisted synthesis of graphene oxide nanosheets

RSC Advances ◽

10.1039/c4ra12022a ◽

2014 ◽

Vol 4 (104) ◽

pp. 60102-60105 ◽

Cited By ~ 12

Author(s):

Xiaobo Wang ◽

Heqing Tang ◽

Shuangshuang Huang ◽

Lihua Zhu

Keyword(s):

Graphene Oxide ◽

Microwave Assisted Synthesis ◽

Graphene Oxide Nanosheets ◽

Microwave Assisted ◽

Microwave Assisted Method

A fast and facile microwave-assisted method was developed for preparing GO.

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Electrodeposition of PANI/MnO2 Composite on SnO2/Ti Substrate for Supercapacitor Electrode

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.1372 ◽

2011 ◽

Vol 239-242 ◽

pp. 1372-1375 ◽

Cited By ~ 3

Author(s):

Ya Kun Zhang ◽

Jian Ling Li ◽

Fei Gao ◽

Xin Dong Wang

Keyword(s):

Cyclic Voltammetry ◽

Synergistic Effect ◽

Specific Capacitance ◽

Current Density ◽

Galvanostatic Charge ◽

Supercapacitor Electrode ◽

Electrochemical Tests ◽

A Current ◽

Charge Discharge

A layer of MnO2 was loaded between the SnO2/Ti substrate and the layer of PANI via a potentiodynamic electrodeposition. Electrochemical tests such as cyclic voltammetry and galvanostatic charge/discharge were applied to investigate the performance of the electrodes. The morphologies of the electrodes were also observed to identify the effect of the MnO2 layer. The specific capacitance of PANI with MnO2 reached to 601.48 F g-1 at a current density of 0.1 mA cm-2, which is 1.69 times as that of PANI electrodes without MnO2 layer. This gratifying result may due to the synergistic effect between MnO2 layer and PANI.

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Synthesis of BCN Nanoparticles Sandwiched between Carbon Nanosheets and Performance in Electrochemical Capacitors

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.719-720.137 ◽

2015 ◽

Vol 719-720 ◽

pp. 137-140

Author(s):

Ren Li Yang ◽

Jun Shuang Zhou ◽

Li Hou ◽

Yu Feng Zhao ◽

Fa Ming Gao

Keyword(s):

Cyclic Voltammetry ◽

Electrochemical Properties ◽

Specific Capacitance ◽

Current Density ◽

Nitrogen Atmosphere ◽

Galvanostatic Charge ◽

Carbon Nanosheets ◽

And Performance ◽

Discharge Measurements ◽

Charge Discharge

BCN nanoparticles sandwiched between carbon nanosheets were synthesized with the P123 and borate ammonium under nitrogen atmosphere. The samples were characterized by SEM, TEM, and EELS. The SEM and TEM images show BCN nanoparticles are attached on the carbon nanosheets. Cyclic voltammetry (CV) and galvanostatic charge-discharge measurements are used to evaluate electrochemical properties of the composites. The samples show the specific capacitance of 102 F/g at current density of 200mA/g and good durability.

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Cyclic Voltammetry and Galvanostatic Charge-Discharge Analyses of Polyaniline/Graphene Oxide Nanocomposite based Supercapacitor

Malaysian Journal on Composites Science and Manufacturing ◽

10.37934/mjcsm.3.1.1426 ◽

2020 ◽

Vol 3 (1) ◽

pp. 14-26

Author(s):

MOHD ASYADI 'AZAM MOHD ABID ◽

Mohd Izham Radzi ◽

Muazzin Mupit ◽

Hisyamuddin Osman ◽

Rose Farahiyan Munawar ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Graphene Oxide ◽

Galvanostatic Charge ◽

Charge Discharge

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Influence of Concentration and Electrodeposition Time on the Electrochemical Supercapacitor Performance of Poly(3,4-Ethylenedioxythiophene)/Graphene Oxide Hybrid Material

Journal of Nanomaterials ◽

10.1155/2016/5935402 ◽

2016 ◽

Vol 2016 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

Nur Hawa Nabilah Azman ◽

Hong Ngee Lim ◽

Yusran Sulaiman

Keyword(s):

Cyclic Voltammetry ◽

Graphene Oxide ◽

Electrochemical Impedance ◽

Galvanostatic Charge ◽

Supercapacitive Performance ◽

Electrodeposition Time ◽

Electrochemical Supercapacitor ◽

Supercapacitor Performance ◽

Energy And Power Density ◽

Charge Discharge

Poly(3,4-ethylenedioxythiophene)/graphene oxide (PEDOT/GO) composites with wrinkled paper-like sheets morphology were electropolymerized potentiostatically at 1.2 V with different electrodeposition times (1–30 min) and various concentrations of GO (0.5, 1.0, 1.5, and 2.0 mg/mL). The electrochemical properties of PEDOT/GO composites as an electrode material for supercapacitor were investigated using cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD). The CV results revealed that PEDOT/GO containing 1.0 mg/mL GO and electropolymerized for 10 minutes exhibited the highest specific capacitance (157.17 F/g). This optimum PEDOT/GO was found to have energy and power density of 18.24 W/kg and 496.64 Wh/kg, respectively, at 1.0 A/g current density. The resistance of charge transfer obtained for PEDOT/GO is very low (13.10 Ω) compared to PEDOT (638.98 Ω), proving that PEDOT/GO has a good supercapacitive performance due to the synergistic effect of the high conductivity of PEDOT and large surface area of GO.

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Li0.95Na0.05Ti2(PO4)3/C with Good Performance as Anode Material for Aqueous Rechargeable Lithium Batteries

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.316 ◽

2014 ◽

Vol 989-994 ◽

pp. 316-319 ◽

Cited By ~ 2

Author(s):

Jing Zhu ◽

Yong Guang Liu ◽

Qing Qing Tian ◽

Ling Wang ◽

Ji Lin Cao

Keyword(s):

Cyclic Voltammetry ◽

Electrochemical Performance ◽

Anode Material ◽

Lithium Batteries ◽

Sol Gel ◽

Nasicon Structure ◽

Galvanostatic Charge ◽

Rechargeable Lithium Batteries ◽

Structure And Morphology ◽

Charge Discharge

Li0.95Na0.05Ti2(PO4)3/C nanocomposite was prepared by sol-gel method.The structure and morphology of the samples were characterized by XRD, SEM which showed the particles had typical NASICON structure and diameter range from 400~500nm. The electrochemical performance were tested by cyclic voltammetry and galvanostatic charge–discharge. Results show Li0.95Na0.05Ti2(PO4)3/C nanocomposite exhibitsmuch better electrochemical performance than bare Li0.95Na0.05Ti2(PO4)3.

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Preparation and Electrochemical Properties of LaMnO3 Powder as a Supercapacitor Electrode Material

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.727.698 ◽

2017 ◽

Vol 727 ◽

pp. 698-704 ◽

Cited By ~ 3

Author(s):

Xian Wei Wang ◽

Xiao Er Wang ◽

Hui Chao Zhang ◽

Qian Qian Zhu ◽

Dong Li Zheng ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Electrochemical Properties ◽

Electrode Material ◽

Raw Materials ◽

Sol Gel ◽

Galvanostatic Charge ◽

Supercapacitor Electrode ◽

Lanthanum Manganate ◽

Pure Phase ◽

Charge Discharge

The structural and electrochemical properties of lanthanum manganate (LaMnO3) powder prepared by the sol-gel method are researched in this article. The powder calcined at 600 °C showed amorphous, and the powder calcined at 700-800 °C showed the pure phase of the LaMnO3. The grains with the size of about 80-120 nm were agglomerating together. Cyclic voltammetry and galvanostatic charge-discharge were used to characterize the electrochemical properties in alkaline environment. The electrochemical properties calcined at 700 °C showed a specific capacitance of 73 F/g at the current density of 0.5 A/g. The raw materials for preparing the LaMnO3 powder are cheap, and the operation method is simple.

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Microwave assisted synthesis of xanthan gum-cl-poly (acrylic acid) based-reduced graphene oxide hydrogel composite for adsorption of methylene blue and methyl violet from aqueous solution

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2018.07.104 ◽

2018 ◽

Vol 119 ◽

pp. 255-269 ◽

Cited By ~ 33

Author(s):

Edwin Makhado ◽

Sadanand Pandey ◽

James Ramontja

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Graphene Oxide ◽

Acrylic Acid ◽

Xanthan Gum ◽

Methyl Violet ◽

Microwave Assisted Synthesis ◽

Microwave Assisted ◽

Hydrogel Composite ◽

Reduced Graphene

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Assessment of Antimicrobial Features of Selenium Nanoparticles (SeNPs) Using Cyclic Voltammetric Strategy

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2019.16627 ◽

2019 ◽

Vol 19 (11) ◽

pp. 7363-7368 ◽

Cited By ~ 3

Author(s):

Madiha Saeed ◽

M. Tayyab Ansari ◽

Imdad Kaleem ◽

Sadia Zafar Bajwa ◽

Asma Rehman ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Biomedical Applications ◽

Selenium Nanoparticles ◽

Size Distributions ◽

Cyclic Voltammetric ◽

Microwave Assisted ◽

Straightforward Method ◽

Microwave Assisted Method ◽

Controllable Size ◽

Cyclic Voltammetry Data

The emerging biomedical applications of selenium nanoparticles (SeNPs) require facile and efficient strategy to assess its interactions with cell membrane. In this study, an efficient and reproducible microwave assisted method was used to synthesize SeNPs with controllable size distributions. The physical properties of the emergent structures, such as morphology, structure, and size were studied. The antimicrobial applications of SeNPs were assessed by electrochemical analyses that entailed the systematic acquisition of cyclic voltammetry data. Our results demonstrate a straightforward method to predict the integrity of bacterial cell membranes following the administration of SeNP treatments.

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