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.

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.

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.

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.

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.

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