Potentiostatically deposited nanostructured CoxNi1-x layered double hydroxides as electrode materials for redox-supercapacitors

Vinay Gupta; Shubhra Gupta; Norio Miura

doi:10.1016/j.jpowsour.2007.09.004

Potentiostatically deposited nanostructured Co_xNi_1-x layered double hydroxides as electrode materials for redox-supercapacitors

Vinay Gupta, Shubhra Gupta, Norio Miura

Physics

Kyushu University

Research output: Contribution to journal › Article › peer-review

297 Scopus citations

Abstract

Cobalt-nickel layered double hydroxides (Co_xNi_1-x LDHs) were deposited onto stainless steel electrodes by the potentiostatic deposition method at -1.0 V vs. Ag/AgCl using various molar ratios of Co(NO₃)₂ and Ni(NO₃)₂ in distilled water. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. A network of Co_xNi_1-x LDH nanosheets was obtained. The nature of the cyclic voltammetry and charge-discharge curves suggested that the Co_xNi_1-x LDHs exist in the form of solid solutions. The capacitive characteristics of the Co_xNi_1-x LDHs in 1 M KOH electrolyte showed that Co_0.72Ni_0.28 LDHs had the highest specific capacitance value, 2104 F g^-1, which is also the highest yet reported value for oxide materials in general.

Original language	British English
Pages (from-to)	680-685
Number of pages	6
Journal	Journal of Power Sources
Volume	175
Issue number	1
DOIs	https://doi.org/10.1016/j.jpowsour.2007.09.004
State	Published - 3 Jan 2008

Keywords

CoNi LDHs
Potentiostatic deposition
Specific capacitance
Supercapacitor

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10.1016/j.jpowsour.2007.09.004

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@article{1d59db066fe842b39f2c6459f4235147,

title = "Potentiostatically deposited nanostructured CoxNi1-x layered double hydroxides as electrode materials for redox-supercapacitors",

abstract = "Cobalt-nickel layered double hydroxides (CoxNi1-x LDHs) were deposited onto stainless steel electrodes by the potentiostatic deposition method at -1.0 V vs. Ag/AgCl using various molar ratios of Co(NO3)2 and Ni(NO3)2 in distilled water. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. A network of CoxNi1-x LDH nanosheets was obtained. The nature of the cyclic voltammetry and charge-discharge curves suggested that the CoxNi1-x LDHs exist in the form of solid solutions. The capacitive characteristics of the CoxNi1-x LDHs in 1 M KOH electrolyte showed that Co0.72Ni0.28 LDHs had the highest specific capacitance value, 2104 F g-1, which is also the highest yet reported value for oxide materials in general.",

keywords = "CoNi LDHs, Potentiostatic deposition, Specific capacitance, Supercapacitor",

author = "Vinay Gupta and Shubhra Gupta and Norio Miura",

note = "Funding Information: The present work was supported by the Japan Science and Technology (JST) Agency through the Core Research for Evolutionary Science and Technology (CREST) program under the project “Development of advanced nanostructured materials for energy conversion and storage.”",

year = "2008",

month = jan,

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doi = "10.1016/j.jpowsour.2007.09.004",

language = "British English",

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T1 - Potentiostatically deposited nanostructured CoxNi1-x layered double hydroxides as electrode materials for redox-supercapacitors

AU - Gupta, Vinay

AU - Gupta, Shubhra

AU - Miura, Norio

N1 - Funding Information: The present work was supported by the Japan Science and Technology (JST) Agency through the Core Research for Evolutionary Science and Technology (CREST) program under the project “Development of advanced nanostructured materials for energy conversion and storage.”

PY - 2008/1/3

Y1 - 2008/1/3

N2 - Cobalt-nickel layered double hydroxides (CoxNi1-x LDHs) were deposited onto stainless steel electrodes by the potentiostatic deposition method at -1.0 V vs. Ag/AgCl using various molar ratios of Co(NO3)2 and Ni(NO3)2 in distilled water. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. A network of CoxNi1-x LDH nanosheets was obtained. The nature of the cyclic voltammetry and charge-discharge curves suggested that the CoxNi1-x LDHs exist in the form of solid solutions. The capacitive characteristics of the CoxNi1-x LDHs in 1 M KOH electrolyte showed that Co0.72Ni0.28 LDHs had the highest specific capacitance value, 2104 F g-1, which is also the highest yet reported value for oxide materials in general.

AB - Cobalt-nickel layered double hydroxides (CoxNi1-x LDHs) were deposited onto stainless steel electrodes by the potentiostatic deposition method at -1.0 V vs. Ag/AgCl using various molar ratios of Co(NO3)2 and Ni(NO3)2 in distilled water. Their structure and surface morphology were studied by using X-ray diffraction analysis, energy dispersive X-ray spectroscopy and scanning electron microscopy. A network of CoxNi1-x LDH nanosheets was obtained. The nature of the cyclic voltammetry and charge-discharge curves suggested that the CoxNi1-x LDHs exist in the form of solid solutions. The capacitive characteristics of the CoxNi1-x LDHs in 1 M KOH electrolyte showed that Co0.72Ni0.28 LDHs had the highest specific capacitance value, 2104 F g-1, which is also the highest yet reported value for oxide materials in general.

KW - CoNi LDHs

KW - Potentiostatic deposition

KW - Specific capacitance

KW - Supercapacitor

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DO - 10.1016/j.jpowsour.2007.09.004

M3 - Article

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SN - 0378-7753

VL - 175

SP - 680

EP - 685

JO - Journal of Power Sources

JF - Journal of Power Sources

IS - 1

ER -

Potentiostatically deposited nanostructured Co_xNi_1-x layered double hydroxides as electrode materials for redox-supercapacitors

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Keywords

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