Hollow Urchins MnO2 Nanoparticles for Electrochemical Supercapacitor Electrodes

2011 ◽  
Vol 347-353 ◽  
pp. 2975-2978
Author(s):  
Xiao Hong Li ◽  
Fei Hu ◽  
Xiang Ping Jiang
Keyword(s):  
Cyclic Voltammetry ◽  
Reaction Time ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Crystallographic Structure ◽  
Hydrothermal Temperature ◽  
Structure And Morphology ◽  
Electrochemical Supercapacitor ◽  
Mno2 Nanoparticles ◽  
Structure Morphology

Manganese dioxide (MnO2) nanostructures have been synthesized by hydrothermal method. The crystallographic structure, morphology, and electrochemical properties of MnO2 nanoparticles have been measured by XRD, SEM, TEM, and cyclic voltammetry (CV). It is shown that the hydrothermal temperature and reaction time have played an important role on the crystallographic structure and morphology of the MnO2 particles. And the MnO2 particles composed of hollow urchins exhibits a higher specific capacitance of 210 F/g.

scholarly journals Effect of Deposition Parameters on Electrochemical Properties of Polypyrrole-Graphene Oxide Films

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 624 ◽  
Author(s):  
Alina Iuliana Pruna ◽  
Nelly Ma. Rosas-Laverde ◽  
David Busquets Mataix
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Electrochemical Properties ◽  
Sodium Dodecyl ◽  
Hybrid Coatings ◽  
Deposition Parameters ◽  
Structure Morphology ◽  
Energy Storage Applications ◽  
Improved Performance ◽  
Sds Surfactant

Graphene oxide (GO)-modified polypyrrole (PPy) coatings were obtained by electrochemical methods in the presence of the anionic surfactant, sodium dodecyl sulfate (SDS). The structure, morphology, and electrochemical properties of the coatings were assessed by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM) and cyclic voltammetry at varying scan rates, respectively. The properties of the obtained coatings were analyzed with the GO and PPy loadings and electrodeposition mode. The hybrid coatings obtained galvanostatically showed a coarser appearance than those deposited by cyclic voltammetry CV mode and improved performance, respectively, which was further enhanced by GO and PPy loading. The capacitance enhancement can be attributed to the SDS surfactant that well dispersed the GO sheets, thus allowing the use of lower GO content for improved contribution, while the choice of suitable electrodeposition parameters is highly important for improving the applicability of GO-modified PPy coatings in energy storage applications.

Nanoplate-like tungsten trioxide (hydrate) films prepared by crystal-seed-assisted hydrothermal reaction

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744072 ◽  
Author(s):  
P. Wang ◽  
L. Yang ◽  
B. Dai ◽  
Z. Yang ◽  
S. Guo ◽  
...  
Keyword(s):  
Thin Films ◽  
Reaction Time ◽  
Hydrothermal Reaction ◽  
Sem Analysis ◽  
Hydrothermal Temperature ◽  
Structure And Morphology ◽  
Transparent Conducting ◽  
Vertically Aligned ◽  
Template Free ◽  
Crystal Seed

Vertically-aligned WO3 nanoplates on transparent conducting fluorine-doped tin oxide (FTO) glass were prepared by a facile template-free crystal-seed-assisted hydrothermal method. The effects of the hydrothermal temperature and reaction time on the crystal structure and morphology of the products were investigated by XRD and SEM. The XRD results showed that the as-prepared thin films obtained below 150[Formula: see text]C comprised orthorhombic WO3 ⋅ H2O and completely converted to monoclinic WO3 at 180[Formula: see text]C. It was also noted that there was a phase transformation from orthorhombic to monoclinic by increasing the reaction time from 1 to 12 h. SEM analysis revealed that WO3 thin films are composed of plate-like nanostructures.

Graphene-NiO Composite Electrode for Supercapacitors

2011 ◽  
Vol 345 ◽  
pp. 75-78 ◽  
Author(s):  
Wei Zhou ◽  
Man Lin Tan ◽  
Xiao Song Zhou
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Composite Electrode ◽  
Electrochemical Impedance ◽  
Graphene Sheets ◽  
Supercapacitor Electrode ◽  
Scan Rate

In this paper, a facilesolution method was employed to synthesize the graphene-NiO composite. SEM and XRD results indicated the graphene sheets were covered by the NiO nanoplates. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to measure the electrochemical properties of the composite. The specific capacitance reached 1292F/g at a scan rate of 5mV/s. The results show that this composite is a promising material for supercapacitor electrode.

Research on Electrochemical Properties of Alpha-Ni(OH)2 Prepared by Electrodeposition Method in the Ethanol and Water System

2011 ◽  
Vol 311-313 ◽  
pp. 1421-1424
Author(s):  
Zheng Jin ◽  
Bo Hong Li ◽  
Chuan Li Qin ◽  
Xiao Min Ren ◽  
Shan Tao Yan ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Electrochemical Techniques ◽  
Water System ◽  
X Ray Diffraction ◽  
Α Phase ◽  
Deposition Voltage ◽  
Deposition Technology

Electronic characterization, Electrochemical properties, Electrochemical techniques, Abstract. In this paper, the α-phase Ni(OH)2was directly deposited on the surface of foam nickel by electrochemical deposition technology. The characterization of the α-phase Ni(OH)2was studied by using X-ray diffraction(XRD), scanning electron microscopy(SEM), cyclic voltammetry(CV) and the constant charge-discharge. The specific capacitance of the a-phase Ni(OH)2electrode, measured using cyclic voltammetry at scan rate of 1mV•s-1, was found to be 2826.77F•g-1. For a simple supercapcitor, the highest specific capacitance(475.76 F•g-1at 30mA) is obtained at deposition voltage of 2.5V and deposition time of 50min.

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

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.

scholarly journals Formation of hexagonal-molybdenum trioxide (h-MoO3) nanostructures and their pseudocapacitive behavior

Nanoscale ◽  
2015 ◽  
Vol 7 (27) ◽  
pp. 11777-11786 ◽  
Author(s):  
Vipin Kumar ◽  
Xu Wang ◽  
Pooi See Lee
Keyword(s):  
Electrochemical Properties ◽  
Molybdenum Trioxide ◽  
Pronounced Effect ◽  
Crystallographic Structure ◽  
Molybdenum Oxides ◽  
Structure And Morphology ◽  
Redox Active ◽  
Pseudocapacitive Behavior

The crystallographic structure and morphology of redox active molybdenum oxides have a pronounced effect on their electrochemical properties.

scholarly journals Electrochemical Properties of Graphene Oxide Nanoribbons/Polypyrrole Nanocomposites

2019 ◽  
Vol 5 (2) ◽  
pp. 18 ◽  
Author(s):  
Johara Al Dream ◽  
Camila Zequine ◽  
K. Siam ◽  
Pawan K. Kahol ◽  
S. R. Mishra ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Graphene Oxide ◽  
Energy Storage ◽  
Conducting Polymers ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Graphene Nanoribbons ◽  
Graphene Oxide Nanoribbons ◽  
Energy Storage Applications

Graphene is a highly studied material due to its unique electrical, optical, and mechanical properties. Graphene is widely applied in the field of energy such as in batteries, supercapacitors, and solar cells. The properties of graphene can be further improved by making nanocomposites with conducting polymers. In this work, graphene oxide nanoribbons (GONRs) were synthesized by unzipping multiwall carbon nanotubes. Graphene nanoribbons were used to make nanocomposites with polypyrrole for energy storage applications. The synthesized nanocomposites were structurally and electrochemically characterized to understand their structure and electrochemical properties. The electrochemical characterizations of these nanocomposites were carried out using cyclic voltammetry. The specific capacitance of the nanocomposites was observed to decrease with increasing scan rates. The highest specific capacitance of 2066 F/g was observed using cyclic voltammetry for the optimized nanocomposite of GONR and polypyrrole. Our study suggests that the electrochemical properties of graphene or polypyrrole can be improved by making their composites and that they could be successfully used as electrode materials for energy storage applications. This study can also be extended to the self-assembly of other conducting polymers and graphene nanoribbons through a simple route for various other applications.

Ni-MnO2 Synthesized by One-Step Liquid Phase Coprecipitation as Promising Electrode Materials for Supercapacitor

2020 ◽  
Vol 999 ◽  
pp. 21-27 ◽  
Author(s):  
Yue Zhou ◽  
Qing Hao Yang ◽  
Jie Dong
Keyword(s):  
Cyclic Voltammetry ◽  
Liquid Phase ◽  
Electrochemical Properties ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Morphology ◽  
Persistence Rate ◽  
One Step

Nickel-doped manganese dioxide (Ni-MnO2) as electrode materials for supercapacitors were successfully prepared by one-step chemical liquid phase coprecipitation with the different nickel doped proportions. X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF) were used to analyze the micro-structure, morphology and composition. And electrochemical properties were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). The results revealed that MnO2 synthesized in this work turned out to be δ-MnO2 of homogeneous dispersion and excellent electrochemical properties. Specific capacitance of 300.85 F/g was achieved for the 2% Ni-doped MnO2 at 2mV/s through cyclic voltammetry, and after 5000 circles the persistence rate of which still remained to 75%, exhibiting a preeminent advantage of stability and reversibility to naked MnO2.

Preparation and Electrochemical Properties of VO2(B) Nano-Belts

2011 ◽  
Vol 694 ◽  
pp. 91-97
Author(s):  
Yu Long Qiao ◽  
Yong Jun Ma ◽  
Qing Ping Luo ◽  
Chong Hua Pei
Keyword(s):  
Cyclic Voltammetry ◽  
Energy Loss ◽  
Electrochemical Properties ◽  
Specific Capacitance ◽  
Hydrothermal Method ◽  
Monoclinic Phase ◽  
Galvanostatic Charge ◽  
Crystal Direction ◽  
Electron Energy Loss ◽  
Charge Discharge

The VO2(B) nanobelts with monoclinic phase were synthesized by a hydrothermal method at 220°C for 48 h in the absence of any surfactants. The electron energy loss spectrum (EELS) demonstrates that vanadium exists only in the 4+ oxidation state. The SEM and TEM images reveal a belt-like structure of the VO2(B) with the length of several micrometers, the width of 140 nm and the thickness of around 20nm and growth along the [110] crystal direction. Cyclic voltammetry (CV) and galvanostatic charge/discharge demonstrate that VO2(B) nano-belts electrode exhibits desirable electrochemical properties and the specific capacitance reaches up to 632.6F•g-1.

scholarly journals Synthesis and Characterization of Nickel-doped Manganese Dioxide Electrode Materials for Supercapacitors

2019 ◽  
Vol 79 ◽  
pp. 03002 ◽  
Author(s):  
Jie Dong ◽  
Zhenzhong Hou ◽  
Qiuli Zhao ◽  
Qinghao Yang
Keyword(s):  
Electrochemical Properties ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Great Influence ◽  
Molar Ratio ◽  
Crystallographic Structure ◽  
Charge Discharge

Nickel-doped manganese dioxide (Ni-MnO2) synthesized by sol-gel method has been used as an electrode material for supercapacitors. The structure and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectrometry (EIS). Results showed that the nickel-doped manganese dioxide sample exhibited irregular particles with the diameter of about 500 nm. The crystallographic structure of MnO2 was the poorly crystallized γ-MnO2. The doping ratio had a great influence on the electrochemical properties of the materials. When the molar ratio of Ni/Mn was 3/100, the specific capacitance of Ni-MnO2 achieved to 252.61 F/g. After 2000 charge/discharge cycles, the specific capacitance of Ni-MnO2 was still maintained at 74.36%, which was attributed to its excellent cycling stability.

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