Cathodic deposition of Ni(OH)2 and Co(OH)2 for asymmetric supercapacitors: Importance of the electrochemical reversibility of redox couples

Hu, Chi‐Chang; Chen, Jia-Cing; Chang, Kuo‐Hsin

doi:10.1016/j.jpowsour.2012.07.111

Cited by 205 publications

(90 citation statements)

References 23 publications

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“…This unique microstructure results from the Ni-free electrolyte used in our work, where Ni 2+ ions come from the Ni anode under potential or over-potential, different from previous work with a Ni 2+ -containing electrolyte as the only Ni source for electrodeposition. 55 In this study, a viscous organic electrolyte (EG) was used to control the diffusion of Ni 2+ (ref. 29 and 56) in order to get a steady deposition on the cathode for the formation of the dendritic DNE.…”

Section: Resultsmentioning

confidence: 99%

Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Liu

Zhang

et al. 2016

J. Mater. Chem. A

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A dendritic Ni@NiO core/shell electrode (DNE) is successfully fabricated by electrodeposition in a Ni-free electrolyte, with a Ni anode providing Ni ions through dissolution and diffusion. The unique structure is ideal for electrochemical energy storage since the dendrites provide a large surface area for easy electrolyte infiltration; the metal core improves the electrode conductivity with a shortened ion diffusion path, and the metal oxide shell is active for faradaic charge storage. As a result, the synthesized DNE demonstrates a high specific capacitance of 1930 F g À1 and a high areal capacitance of 1.35 F cm À2 , with super-long cycle stability. The gravimetric capacitance of the DNE hardly shows any decay after 70 000 cycles at a scan rate of 100 mV s À1 . It was also demonstrated that our electrodeposition method in a source-free electrolyte is universal to deposit dendritic Ni-compounds on many other types of substrates, versatile for different applications.

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Section: Resultsmentioning

confidence: 99%

Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Liu

Zhang

et al. 2016

J. Mater. Chem. A

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“…Although the cycle life is greatly influenced by the parameters involved in the above processes, e.g., electronic conductivity, porous or hierarchical structure, nano-size and compositing, it also strongly depends on the redox process (reversible Faradaic reaction). This indicates that the factors directly correlated with the redox process, e.g., active species at oxidative state or reductive state may improve the cycle life of electrode, e.g., it is found that the electrochemical reversibility of the pseudocapacitive electrode materials is the key factor determining the capacitance retention: due to better electrochemical reversibility, Co(OH) 2 -graphene shows high capacitance retention than the Ni(OH) 2 -graphene system [28]. Alternatively, introducing a redox-active electrolyte of cupric chloride in an aqueous HNO 3 solution, galvanostatic capacitances of 1335 F g -1 with retention of 99.4% after 5000 cycles at 60 A g -1 was obtained [29].…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of Cu2O/CuO/RGO nanocomposite and its superior cyclability in supercapacitor

Wang

Dong

Zhao

et al. 2015

Electrochimica Acta

237

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“…[1][2][3][4][5] Differently from LIBs, which can provide large energy density, ECs offer transient, but ultrahigh power, long cycle life, and short charge/discharge duration, while providing a relatively low energy supply for the time-dependent needs of systems. To improve this drawback, transition-metal oxides, including ruthenium oxides (RuO 2 ), [6] cobalt oxides (CoO x ), [7][8][9] nickel oxides (NiO x ), [10,11] vanadium oxides (V 2 O 5 , VO x ), [12,13] and manganese oxides (MnO 2 , Mn 3 O 4 ) [14] have been employed as alternatives to replace activated carbons because these materials can provide not only double-layer capacitances, but also high pseudocapacitances derived from highly reversible surface Faradic reactions. [8,12,[15][16][17][18][19] Among the transition-metal oxides adopted, manganese oxides have been considered as promising materials for ECs because of their low cost, high theoretical capacitance, ideal capacitive response, and environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

Chou

Doong

et al. 2014

ChemSusChem

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A promising energy storage material, MnO2 /hierarchically porous carbon (HPC) nanocomposites, with exceptional electrochemical performance and ultrahigh energy density was developed for asymmetric supercapacitor applications. The microstructures of MnO2 /HPC nanocomposites were characterized by transmission electron microscopy, scanning transmission electron microscopy, and electron dispersive X-ray elemental mapping analysis. The 3-5 nm MnO2 nanocrystals at mass loadings of 7.3-10.8 wt % are homogeneously distributed onto the HPCs, and the utilization efficiency of MnO2 on specific capacitance can be enhanced to 94-96 %. By combining the ultrahigh utilization efficiency of MnO2 and the conductive and ion-transport advantages of HPCs, MnO2 /HPC electrodes can achieve higher specific capacitance values (196 F g(-1) ) than those of pure carbon electrodes (60.8 F g(-1) ), and maintain their superior rate capability in neutral electrolyte solutions. The asymmetric supercapacitor consisting of a MnO2 /HPC cathode and a HPC anode shows an excellent performance with energy and power densities of 15.3 Wh kg(-1) and 19.8 kW kg(-1) , respectively, at a cell voltage of 2 V. Results obtained herein demonstrate the excellence of MnO2 /HPC nanocomposites as energy storage material and open an avenue to fabricate the next generation supercapacitors with both high power and energy densities.

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Cathodic deposition of Ni(OH)2 and Co(OH)2 for asymmetric supercapacitors: Importance of the electrochemical reversibility of redox couples

Cited by 205 publications

References 23 publications

Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Ni@NiO core/shell dendrites for ultra-long cycle life electrochemical energy storage

Facile synthesis of Cu2O/CuO/RGO nanocomposite and its superior cyclability in supercapacitor

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

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