Improvement of Electrochemical Performance of ZnCo2O4@Co9S8 Nanosheets for Supercapacitors

2021 ◽  
Vol 16 (7) ◽  
pp. 1058-1062
Author(s):  
Yucai Li ◽  
Yan Zhao ◽  
Dong Zhang ◽  
Shiwei Song ◽  
Jian Wang ◽  
...  
Keyword(s):  
Composite Material ◽  
Thermal Treatment ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Active Site ◽  
Treatment Process ◽  
Electrode Materials ◽  
Ni Foam ◽  
Facile Hydrothermal Method ◽  
Electrochemical Electrode

ZnCo2O4@Co9S8 nanostructures were grown on the surface of Ni foam by facile hydrothermal method and subsequent thermal treatment process, thus increasing the active site on the surface of the material. After vulcanization treatment, the performance of the composite material has been significantly improved the product has a higher specific capacitance of 1018.2 F g−1 at 4 A g−1. This work demonstrates that ZnCo2O4@Co9S8 nanostructures are highly desirable for application as advanced electrochemical electrode materials.

Poly(aniline-co-pyrrole)-coated Ni-doped manganese dioxide as electrode materials for supercapacitors

2020 ◽  
Vol 13 (02) ◽  
pp. 2051007
Author(s):  
Jie Dong ◽  
Qinghao Yang ◽  
Qiuli Zhao ◽  
Zhenzhong Hou ◽  
Yue Zhou ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
Cycle Stability ◽  
Mass Ratio ◽  
Scan Rate ◽  
Poly Aniline ◽  
Inorganic And Organic

Electrode materials with a high specific capacitance, outstanding reversibility and excellent cycle stability are constantly pursued for supercapacitors. In this paper, we present an approach to improve the electrochemical performance by combining the advantages of both inorganic and organic. Ni-MnO2/PANi-co-PPy composites are synthesized, with the copolymer of aniline/pyrrole being coated on the surface of Ni-doped manganese dioxide nanospheres. The inorganic–organic composite enables a substantial increase in its specific capacitance and cycle stability. When the mass ratio of Ni-MnO2 to aniline and pyrrole mixed monomer is 1:5, the composite delivers high specific capacitance of 445.49[Formula: see text]F/g at a scan rate of 2[Formula: see text]mV/s and excellent cycle stability of 61.65% retention after 5000 cycles. The results indicate that the Ni-MnO2/PANi-co-PPy composites are promising electrode materials for future supercapacitors application.

scholarly journals A Hierarchical Architecture of Functionalized Polyaniline/Manganese Dioxide Composite with Stable-Enhanced Electrochemical Performance

2021 ◽  
Vol 5 (5) ◽  
pp. 129
Author(s):  
Yapeng Wang ◽  
Yanxiang Wang ◽  
Chengjuan Wang ◽  
Yongbo Wang
Keyword(s):  
Electrochemical Performance ◽  
Manganese Dioxide ◽  
Specific Capacitance ◽  
Current Density ◽  
Electrode Materials ◽  
High Efficiency ◽  
Scanning Speed ◽  
Hierarchical Architecture ◽  
Electrochemical Window ◽  
A Current

As one of the most outstanding high-efficiency and environmentally friendly energy storage devices, the supercapacitor has received extensive attention across the world. As a member of transition metal oxides widely used in electrode materials, manganese dioxide (MnO2) has a huge development potential due to its excellent theoretical capacitance value and large electrochemical window. In this paper, MnO2 was prepared at different temperatures by a liquid phase precipitation method, and polyaniline/manganese dioxide (PANI/MnO2) composite materials were further prepared in a MnO2 suspension. MnO2 and PANI/MnO2 synthesized at a temperature of 40 °C exhibit the best electrochemical performance. The specific capacitance of the sample MnO2-40 is 254.9 F/g at a scanning speed of 5 mV/s and the specific capacitance is 241.6 F/g at a current density of 1 A/g. The specific capacitance value of the sample PANI/MnO2-40 is 323.7 F/g at a scanning speed of 5 mV/s, and the specific capacitance is 291.7 F/g at a current density of 1 A/g, and both of them are higher than the specific capacitance value of MnO2. This is because the δ-MnO2 synthesized at 40 °C has a layered structure, which has a large specific surface area and can accommodate enough electrolyte ions to participate the electrochemical reaction, thus providing sufficient specific capacitance.

Fabrication of nickel-foam-supported layered zinc–cobalt hydroxide nanoflakes for high electrochemical performance in supercapacitors

2014 ◽  
Vol 50 (76) ◽  
pp. 11188-11191 ◽  
Author(s):  
Peng Yuan ◽  
Ning Zhang ◽  
Dan Zhang ◽  
Tao Liu ◽  
Limiao Chen ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Electrode Materials ◽  
Solvothermal Method ◽  
Nickel Foam ◽  
Cycling Stability ◽  
Cobalt Hydroxide ◽  
Facile Solvothermal Method

Nickel foam supported Zn–Co hydroxide nanoflakes were fabricated by a facile solvothermal method, which exhibited excellent specific capacitance and remarkable cycling stability as electrode materials in supercapacitors.

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 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.

Rational Design of Co3O4 Nano-Flowers for High Performance Supercapacitors

2020 ◽  
Vol 15 (1) ◽  
pp. 147-153
Author(s):  
Yucai Li ◽  
Yan Zhao ◽  
Dong Zhang ◽  
Shiwei Song ◽  
Jian Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Rational Design ◽  
Electrode Materials ◽  
High Specific Capacitance ◽  
High Energy ◽  
High Energy Density ◽  
Storage Device ◽  
Facile Hydrothermal Method ◽  
Promising Application

Electrochemical performance of the electrode materials is seriously dependent on the structure and morphology of the electrode material. In this work, the nanoflower-like Co3O4 samples are successfully prepared on Ni foam via a facile hydrothermal method. The as-fabricated Co3O4 samples exhibit superior electrochemical performance with a high specific capacitance of 382.6 C g-1 at 1 A g-1 and excellent capacitance retention. In addition, the as-fabricated device presents a high energy density of 23.6 Wh kg-1 at a power density of 508.6 W kg-1 and excellent cycle stability with a capacitance retention of 81.2% after 10000 cycles, indicating a promising application as electrodes for energy storage device.

Facile Hydrothermal Synthesis and Electrochemical Performance of NiCo2O4 Nanoneedles

2020 ◽  
Vol 15 (2) ◽  
pp. 164-170
Author(s):  
Duo Cui ◽  
Rongda Zhao ◽  
Jun Xiang ◽  
Fufa Wu ◽  
Lijun Xin ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Spatial Structure ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Retention Rate ◽  
Cyclic Stability ◽  
Ni Foam ◽  
Asymmetric Supercapacitors ◽  
Hybrid Supercapacitors ◽  
One Step

NiCo2O4 nanoneedles on the surface of Ni foam were grown by a simple one step hydrothermal method, which is used as the working electrode for asymmetric supercapacitors. Its area specific capacitance is 981.64 C cm–2 at 1 mA cm–2, and the cycling stability can reach 100% after 10000 cycles at 4 mA cm–2. The spatial structure of the nanoneedle has important influence on the cyclic stability of NiCo2O4 electrode. The hybrid supercapacitors are prepared on the basis of the prepared NiCo2O4 nanoneedle electrodes. After 8000 cycles, its cycle life is stable and the capacitance retention rate reaches 100%.

The Effect of Support on the Electrochemical Performance of Composite Electrode Materials for Supercapacit

2011 ◽  
Vol 239-242 ◽  
pp. 1010-1013 ◽  
Author(s):  
Yan Hong Sun ◽  
Jia Chang Zhao ◽  
Hong Hua Zhou ◽  
Bo He Jin Tang ◽  
Yu Qing Gu ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Specific Capacitance ◽  
Surface Area ◽  
Specific Surface Area ◽  
Composite Electrode ◽  
Electrode Materials ◽  
Incipient Wetness Impregnation ◽  
Nickel Compounds ◽  
Effect Of Support

Composite electrode materials for supercapacitor were prepared by a combination of incipient wetness impregnation and hydrothermal method in this study. The materials were characterized by XRD, specific surface area and electrochemical testing. The effect of support on the electrochemical performance of the composite electrode materials was investigated. The result shows that the samples prepared by different supports contain nickel nitrate hydroxide hydrate (the electroactive material in the composite) and undecomposed nickel nitrate.The specific surface area decrease after the loading of nickel compounds, which indicates the exisitance of nickel compounds in the pores. The composite prepared by using diatomite support exhibits higher specific capacitance than those prepared by using SBA-15 and Ti-Si molecular sieve, which delivers the specific capacitance of 1162.77 F/g at the scan rate of 5 mV/s.

scholarly journals Preparation of Lignin Carbon/Zinc Oxide Electrode Material and Its Application in Supercapacitors

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3554
Author(s):  
Gaijuan Guo ◽  
Zijing Zhou ◽  
Jinda Li ◽  
Hong Yan ◽  
Fen Li
Keyword(s):  
Zinc Oxide ◽  
Composite Material ◽  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Performance Test ◽  
Retention Rate ◽  
Amorphous Structure ◽  
Diffraction Field ◽  
Control Group ◽  
Adsorption Desorption

In this paper, carbon/zinc oxide (LC/ZnO) composites were successfully synthesized and characterized by X-ray powder diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, Raman, thermogravimetry, and N2 adsorption–desorption, and tested by electrochemical performance. Studies have shown that the morphology of LC/ZnO composites is that lignin pellets are embedded in ZnO microplates. The lignin carbon in the composites mainly exists in an amorphous structure, and the specific surface area and pore channels of metal oxides are increased by the presence of lignin carbon. The electrochemical performance test shows that the carbonization temperature of LC/ZnO with the highest specific capacitance is 550 °C, and the capacitance retention rate reaches 96.74% after 1000 cycles of testing, indicating that the composite material has good cycle stability. Compared with the control group, it is found that the specific capacitance of LC/ZnO-550 °C is 2.3 times and 1.8 times that of ZnO-550 °C and LC-550 °C, respectively. This shows that during the electrochemical test, the lignin carbon and the metal oxide promote each other and act synergistically. In addition, the composite material exhibits the characteristics of a pseudo-capacitance capacitor, indicating that the redox reaction occurred in the electrochemical performance test.

scholarly journals A facile one-step hydrothermal approach to synthesize hierarchical core–shell NiFe2O4@NiFe2O4 nanosheet arrays on Ni foam with large specific capacitance for supercapacitors

RSC Advances ◽  
2018 ◽  
Vol 8 (27) ◽  
pp. 15222-15228 ◽  
Author(s):  
Xinyang Zhang ◽  
Ziqing Zhang ◽  
Shuanggan Sun ◽  
Yunpeng Wu ◽  
Qiushi Sun ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Hydrothermal Method ◽  
Core Shell ◽  
Ni Foam ◽  
Nanosheet Arrays ◽  
One Step ◽  
Hydrothermal Approach

Hierarchical NiFe2O4@NiFe2O4 core–shell nanosheet arrays synthesized via one-step hydrothermal method with a successive annealing exhibited outstanding electrochemical performance.

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