A Facile Synthesis of NiFe2O4 with High Specific Capacitance as Supercapacitor Electrode Material

2018 ◽  
Vol 281 ◽  
pp. 854-858
Author(s):  
Xi Cheng Gao ◽  
Jian Qiang Bi ◽  
Wei Li Wang ◽  
Guo Xun Sun ◽  
Xu Xia Hao ◽  
...  
Keyword(s):  
Particle Size ◽  
Specific Capacitance ◽  
Electrochemical Property ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Constant Current ◽  
X Ray Diffraction ◽  
Supercapacitor Electrode ◽  
Constant Current Charge ◽  
Supercapacitor Electrode Materials

NiFe2O4 powders were synthesized by a facile hydrothermal method at 180°C followed by a thermal treatment at 300°C. The phase composition and morphology were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that the NiFe2O4 powders were well-crystallized, and they possessed a particle size in the range of 50-100 nm. The electrochemical property was characterized via cyclic voltammetry (CV) and constant current charge-discharge method. Encouragingly, the NiFe2O4 powders had an excellent electrochemical property, whose specific capacitance reached 266.84 F/g at the electric current density of 1 A/g due to the small particle size. Compared with other Fe-based metal compound oxides, NiFe2O4 has a better electrochemical performance, which can be widely used in the supercapacitor electrode materials.

Effect of dopant on the morphology and electrochemical performance of Ni1-xCaxCo2O4 (0 ≤ x ≤ 0.8) oxide hierarchical structures

MRS Advances ◽  
2020 ◽  
pp. 1-8
Author(s):  
D. Guragain ◽  
C. Zequine ◽  
R. Bhattarai ◽  
J. Choi ◽  
R. K. Gupta ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Energy Band ◽  
Electrode Materials ◽  
Morphological Structure ◽  
Hierarchical Structures ◽  
High Specific Capacitance ◽  
Supercapacitor Electrode ◽  
Binary Metal Oxides ◽  
Supercapacitor Electrode Materials

ABSTRACT The binary metal oxides are increasingly used as supercapacitor electrode materials in energy storing devices. Particularly NiCo2O4 has shown promising electrocapacitive performance with high specific capacitance and energy density. The electrocapacitive performance of these oxides largely depends on their morphology and electrical properties governed by their energy band-gaps and defects. The morphological structure of NiCo2O4 can be altered via the synthesis route, while the energy band-gap could be altered by doping. Also, doping can enhance crystal stability and bring in grain refinement, which can further improve the much-needed surface area for high specific capacitance. Given the above, this study evaluates the electrochemical performance of Ca-doped Ni1-xCaxCo2O4 (0 ≤ x ≤ 0.8) compounds. This stipulates promising applications for electrodes in future supercapacitors.

Electrodeposition of Manganese Oxide Nanosheets as Supercapacitor Electrode Materials

2016 ◽  
Vol 675-676 ◽  
pp. 273-276 ◽  
Author(s):  
Tuntumrong Wanchaem ◽  
Songsak Rattanamai ◽  
Paweena Dulyaseree ◽  
Wirat Jarernboon ◽  
Winadda Wongwiriyapan
Keyword(s):  
Thin Films ◽  
Manganese Oxide ◽  
Specific Capacitance ◽  
Deposition Time ◽  
Electrode Materials ◽  
Constant Current ◽  
Manganese Sulfate ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials ◽  
Ss 304

Manganese oxide (MnOx) thin films were prepared on stainless steel (SS) 304 by galvanostatic (GS) mode of electrodeposition technique using different precursors; 0.1 M potassium permanganate (KMnO4) and 0.1 M manganese sulfate (MnSO4) solutions. The electrodeposition condition was set at a constant current of 1 mA/cm2. Different precursors provide MnOx thin films with different morphologies. Using KMnO4 as a precursor, the MnOx thin film was deposited (MnOx-K), while using MnSO4 as a precursor, the MnOx nanosheets with a thickness of approximately 40 nm were formed (MnOx-S). XPS results evidence the formation of manganese oxide with different oxidation states composition by different precursors. Electrochemical measurements were carried out in a three-electrode setup using Pt and Ag/AgCl electrodes as counting and reference electrodes, respectively and 1M Na2SO4 aqueous solution as electrolyte. MnOx-K at a deposition time of 10 min shows the highest specific capacitance of 233.55±19.01 F/g. The specific capacitance improvement of MnOx-K may be attributed to MnOx nanosheet structure which increases surface area of electrode.

scholarly journals Nanoflower Ni(OH)2 grown in situ on Ni foam for high-performance supercapacitor electrode materials

2021 ◽  
Vol 5 (20) ◽  
pp. 5236-5246
Author(s):  
Xuerui Yi ◽  
Huapeng Sun ◽  
Neil Robertson ◽  
Caroline Kirk
Keyword(s):  
Specific Capacitance ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Ni Foam ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials

Nanoflower Ni(OH)2 shows exceptionally high specific capacitance.

scholarly journals Cauliflower-Like Co3O4/Three-Dimensional Graphene Composite for High Performance Supercapacitor Applications

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Huili Liu ◽  
Xinglong Gou ◽  
Yi Wang ◽  
Xuan Du ◽  
Can Quan ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Constant Current ◽  
Supercapacitor Electrode ◽  
3D Graphene ◽  
Graphene Composite ◽  
Transmission Electron ◽  
Constant Current Charge ◽  
Supercapacitor Electrode Materials

Cauliflower-like Co3O4/three-dimensional (3D) graphene nanocomposite material was synthesized by a facile two-step synthesis route (heat reduction of graphite oxide (GO) and hydrothermal synthesis of Co3O4). The phase composition, morphology, and structure of the as-obtained products were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). Electrochemical properties as supercapacitor electrode materials were systematically investigated by cyclic voltammetry (CV) and constant current charge-discharge tests. It was found that the Co3O4/3D graphene composite showed a maximum specific capacitance of 863 F g−1, which was obtained by means of CVs at a scan rate of 1 mV s−1in 6 M KOH aqueous solution. Moreover, the composite exhibited improved cycling stability after 1,000 cycles. The good supercapacitor performance is ascribed to the combination of 3D graphene and cauliflower-like Co3O4, which leads to a strong synergistic effect to remarkably boost the utilization ratio of Co3O4and graphene for high capacitance.

Hierarchical Dendritic Polypyrrole with High Specific Capacitance for High-performance Supercapacitor Electrode Materials

2017 ◽  
Vol 20 (4) ◽  
pp. 197-204
Author(s):  
Weiliang Chen ◽  
Shuhua Pang ◽  
Zheng Liu ◽  
Zhewei Yang ◽  
Xin Fan ◽  
...  
Keyword(s):  
Specific Capacitance ◽  
Current Density ◽  
High Performance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Chemical Oxidation ◽  
Channel Structure ◽  
Supercapacitor Electrode ◽  
Infrared Spectrometer ◽  
A Current

Polypyrrole with hierarchical dendritic structures assembled with cauliflower-like structure of nanospheres, was synthesized by chemical oxidation polymerization. The structure of polyryrrole was characterized by Fourier transform infrared spectrometer and scanning electron microscopy. The electrochemical performance was performed on CHI660 electrochemical workstation. The results show that oxalic acid has a significant effect on morphology of PPy products. The hierarchical dendritic PPyOA(3) electrodes possess a large specific capacitance as high as 744 F/g at a current density of 0.2 A/g and could achieve a higher specific capacitance of 362 F/g even at a current density of 5.0 A/g. Moreover, the dendritic PPy products produce a large surface area on the electrode through the formation of the channel structure with their assembled cauliflower-like morphology, which facilitates the charge/electron transfer relative to the spherical PPy electrode. The spherical dendritic PPyOA(3) electrode has 58% retention of initial specific capacitance after 260 cycles. The as-prepared dendritic polypyrrole with high performance is a promsing electrode material for supercapacitor.

Synthesis of wood derived nitrogen-doped porous carbon–polyaniline composites for supercapacitor electrode materials

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 30943-30949 ◽  
Author(s):  
Shuai Yu ◽  
Duo Liu ◽  
Shuyan Zhao ◽  
Binfu Bao ◽  
Chunde Jin ◽  
...  
Keyword(s):  
Energy Density ◽  
Specific Capacitance ◽  
Porous Carbon ◽  
Electrode Materials ◽  
Supercapacitor Electrode ◽  
Nitrogen Doped ◽  
Similar Materials ◽  
Polyaniline Composites ◽  
Supercapacitor Electrode Materials

Wood derived carbon–polyaniline composites exhibit comparable specific capacitance (347 F g−1) and energy density (44.4 W h kg−1) to similar materials.

scholarly journals Sol-gel synthesis and electrochemical performance of NiCo2O4 nanoparticles for supercapacitor applications

2019 ◽  
Vol 9 (4) ◽  
pp. 243-253
Author(s):  
Yong Zhang ◽  
Yi Ru ◽  
Hai-Li Gao ◽  
Shi-Wen Wang ◽  
Ji Yan ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Retention Rate ◽  
Sol Gel ◽  
High Specific Capacitance ◽  
Supercapacitor Electrode ◽  
Electrochemical Tests ◽  
Potential Electrode ◽  
Current Densities

In this work, NiCo2O4 nanoparticles with enhanced supercapacitive performance have been successfully synthesized via a facile sol-gel method and subsequent calcination in air. The morphology and composition of as-prepared samples were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray dif­fraction (XRD), and Raman spectroscopy (Raman). The electrochemical per­formances of NiCo2O4 nanoparticles as supercapacitor electrode materials were evalu­ated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) tests in 3 mol L-1 KOH aqueous solution. The results show that as-prepared NiCo2O4 nanoparticles have diameters of about 20-30 nm with uniform distribution. There are some interspaces between nanoparticles observed, which could increase the effective contact area with the electrolyte and provide fast path for the insertion and extraction of electrolyte ions. The electrochemical tests show that the prepared NiCo2O4 nanoparticles for supercapacitors exhibit excellent electrochemical performance with high specific capacitance and good cycle stability. The specific capacitance of NiCo2O4 electrode has been found as high as 1080, 800, 651, and 574 F g-1 at current densities of 1, 4, 7, and 10 A g-1, respectively. Notably, the capacitance retention rate (compared with 1 A g-1) is up to 74.1 %, 60.3 %, and 53.1 % at current densities of 4, 7, and 10 A g-1, respectively. After 100 cycles, higher capacitance retention rate is also achieved. Therefore, the results indicate that NiCo2O4 material is the potential electrode material for supercapacitors.

scholarly journals Amorphous molybdenum sulfide on graphene–carbon nanotube hybrids as supercapacitor electrode materials

RSC Advances ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 6856-6864 ◽  
Author(s):  
Kien-Cuong Pham ◽  
David S. McPhail ◽  
Andrew T. S. Wee ◽  
Daniel H. C. Chua
Keyword(s):  
Carbon Nanotube ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Electrode Materials ◽  
Carbon Support ◽  
Molybdenum Sulfide ◽  
High Specific Surface Area ◽  
Supercapacitor Electrode ◽  
Supercapacitor Electrode Materials

Deposition of amorphous molybdenum sulfide on a high specific surface area carbon support strongly enhanced the specific capacitance of the material.

High specific capacitance of a 3D-metal–organic framework confined growth in CoMn2O4 nanostars as advanced supercapacitor electrode materials

2021 ◽  
Author(s):  
Reza Abazari ◽  
Soheila Sanati ◽  
Ali Morsali ◽  
Deepak P. Dubal
Keyword(s):  
Fossil Fuels ◽  
Electrode Materials ◽  
Metal Organic Framework ◽  
High Specific Capacitance ◽  
Environmental Concerns ◽  
Supercapacitor Electrode ◽  
Confined Growth ◽  
Metal Organic ◽  
Supercapacitor Electrode Materials ◽  
Energy Shortage

IIn the presence of fossil fuels, several environmental concerns e.g. energy shortage, environmental pollution, and global warming may occur in the present century. In this respect, supercapacitors have been introduced...

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