Tunable supercapacitor performance of potentiodynamically deposited urea-doped cobalt hydroxide

RSC Advances ◽  
2014 ◽  
Vol 4 (59) ◽  
pp. 31219-31225 ◽  
Author(s):  
Palanisamy Vinothbabu ◽  
Perumal Elumalai
Keyword(s):  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Cobalt Hydroxide ◽  
Supercapacitor Performance ◽  
Basal Length

The influence of the basal length of Co(OH)2 on supercapacitor performance was examined in detail by adding simple urea molecules during deposition. It was observed that the specific capacitance of Co(OH)2 could be tuned from 700 to 1200 F g−1. This high specific capacitance was attributed to the better access of electrolyte.

A facile phase transformation method for the preparation of 3D flower-like β-Ni(OH)2/GO/CNTs composite with excellent supercapacitor performance

2014 ◽  
Vol 2 (32) ◽  
pp. 12692-12696 ◽  
Author(s):  
Xiaowei Ma ◽  
Jiwei Liu ◽  
Chongyun Liang ◽  
Xiwen Gong ◽  
Renchao Che
Keyword(s):  
Phase Transformation ◽  
Specific Capacitance ◽  
High Specific Capacitance ◽  
Transformation Method ◽  
Cycling Performance ◽  
Supercapacitor Performance

3D flower-like β-Ni(OH)2/GO/CNTs composite prepared via facile phase transformation method exhibited high specific capacitance (96% of theoretical pseudocapacitance at 2 A g−1) and good cycling performance.

scholarly journals Enhanced Supercapacitor Performance Based on CoAl Layered Double Hydroxide-Polyaniline Hybrid Electrodes Manufactured Using Hydrothermal-Electrodeposition Technology

Molecules ◽  
2019 ◽  
Vol 24 (5) ◽  
pp. 976 ◽  
Author(s):  
Guoshen Yang ◽  
Takahiro Takei ◽  
Sayaka Yanagida ◽  
Nobuhiro Kumada
Keyword(s):  
Specific Capacitance ◽  
Layered Double Hydroxide ◽  
Electrochemical Impedance ◽  
Degradation Products ◽  
Synergistic Effects ◽  
High Specific Capacitance ◽  
Cyclic Stability ◽  
Supercapacitor Performance ◽  
New Perspective ◽  
Double Hydroxide

Electrodes with nanosheet architectures can offer the possibility to achieve enhanced energy storage performance. Herein, we have designed and synthesized novel nanosheet structures of CoAl layered double hydroxide (LDH)-polyaniline (PANI) nanocomposite thin films by a hydrothermal-electrodeposition method. The molecular structure, crystal structure, morphology and chemical composition of the composites were characterized by FT-IR, XRD (SXRD), FESEM, and XPS, whereas their electrochemical properties were evaluated by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge-discharge tests. Compared with the unmodified CoAl LDH, the CoAl LDH-PANI exhibits significantly improved the specific capacitance and cyclic stability. The composite exhibits a high specific capacitance of 528 F/g at a current density of 10 A/g and excellent cyclic stability with an increase of the specific capacitance of 42.7% after 6000 cycle tests. We revealed the degradation behavior of PANI in 1 M KOH/KCl electrolyte, and the active degradation products also further increased the total specific capacitance of the composite. The enhanced electrochemical performance of the nanocomposite can be attributed to its well-designed nanostructure and the synergistic effects of each component. By analyzing the band structure and density of states of CoAl LDH and PANI, we proposed the possible mechanism of synergistic effect in a new perspective.

Nanostructured cobalt hydroxide thin films as high performance pseudocapacitor electrodes by graphene oxide wrapping

2015 ◽  
Vol 44 (36) ◽  
pp. 16119-16126 ◽  
Author(s):  
Sangmi Bae ◽  
Ji-Hyun Cha ◽  
Jong Hyeon Lee ◽  
Duk-Young Jung
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Specific Capacitance ◽  
High Performance ◽  
High Specific Capacitance ◽  
Cobalt Hydroxide ◽  
Nickel Electrode ◽  
Cyclic Stability

Thin cobalt hydroxide nanoplates on nickel electrode exhibit a high specific capacitance and good cyclic stability due to fast electrolyte diffusion in their nanostructures and GO wrapping.

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.

Ni(OH)2/3D-rGO supercapacitor material with high specific capacitance

2021 ◽  
Vol 27 ◽  
pp. 102292
Author(s):  
Wei Zeng ◽  
Qiannan Feng ◽  
Jiongliang Yuan
Keyword(s):  
Specific Capacitance ◽  
High Specific Capacitance
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