Potentiostatically deposited nanostructured α-Co(OH)2: A high performance electrode material for redox-capacitors

Vinay Gupta; Teruki Kusahara; Hiroshi Toyama; Shubhra Gupta; Norio Miura

doi:10.1016/j.elecom.2007.06.041

Potentiostatically deposited nanostructured α-Co(OH)₂: A high performance electrode material for redox-capacitors

Vinay Gupta, Teruki Kusahara, Hiroshi Toyama, Shubhra Gupta, Norio Miura

Physics

Kyushu University

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

310 Scopus citations

Abstract

A high specific capacitance was obtained for α-Co(OH)₂ potentiostatically deposited onto a stainless-steel electrode in 0.1 M Co(NO₃)₂ electrolyte at -1.0 V vs. Ag/AgCl. The structure and surface morphology of the obtained α-Co(OH)₂ were studied by using X-ray diffraction analysis and scanning electron microscopy. A network of nanolayered α-Co(OH)₂ sheets was obtained; the average thickness of individual α-Co(OH)₂ sheets was 10 nm, and the thickness of the deposit was several micrometers. The capacitive characteristics of the α-Co(OH)₂ electrodes were investigated by means of cyclic voltammetry and constant current charge-discharge cycling in 1 M KOH electrolyte. A specific capacitance of 860 F g^-1 was obtained for a 0.8 mg cm^-2 α-Co(OH)₂ deposit. The specific capacitance did not decrease significantly for the active mass loading range of 0.1-0.8 mg cm^-2 due its layered structure, which allowed easy penetration of electrolyte and effective utilization of electrode material even at a higher mass. This opens up the possibility of using such materials in supercapacitor applications.

Original language	British English
Pages (from-to)	2315-2319
Number of pages	5
Journal	Electrochemistry Communications
Volume	9
Issue number	9
DOIs	https://doi.org/10.1016/j.elecom.2007.06.041
State	Published - Sep 2007

Keywords

Capacitance
Cobalt hydroxide
Potentiostatic deposition
Supercapacitor

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10.1016/j.elecom.2007.06.041

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@article{d52a877cc0614098a2753e9eb7ba43e0,

title = "Potentiostatically deposited nanostructured α-Co(OH)2: A high performance electrode material for redox-capacitors",

abstract = "A high specific capacitance was obtained for α-Co(OH)2 potentiostatically deposited onto a stainless-steel electrode in 0.1 M Co(NO3)2 electrolyte at -1.0 V vs. Ag/AgCl. The structure and surface morphology of the obtained α-Co(OH)2 were studied by using X-ray diffraction analysis and scanning electron microscopy. A network of nanolayered α-Co(OH)2 sheets was obtained; the average thickness of individual α-Co(OH)2 sheets was 10 nm, and the thickness of the deposit was several micrometers. The capacitive characteristics of the α-Co(OH)2 electrodes were investigated by means of cyclic voltammetry and constant current charge-discharge cycling in 1 M KOH electrolyte. A specific capacitance of 860 F g-1 was obtained for a 0.8 mg cm-2 α-Co(OH)2 deposit. The specific capacitance did not decrease significantly for the active mass loading range of 0.1-0.8 mg cm-2 due its layered structure, which allowed easy penetration of electrolyte and effective utilization of electrode material even at a higher mass. This opens up the possibility of using such materials in supercapacitor applications.",

keywords = "Capacitance, Cobalt hydroxide, Potentiostatic deposition, Supercapacitor",

author = "Vinay Gupta and Teruki Kusahara and Hiroshi Toyama 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 = "2007",

month = sep,

doi = "10.1016/j.elecom.2007.06.041",

language = "British English",

volume = "9",

pages = "2315--2319",

journal = "Electrochemistry Communications",

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TY - JOUR

T1 - Potentiostatically deposited nanostructured α-Co(OH)2

T2 - A high performance electrode material for redox-capacitors

AU - Gupta, Vinay

AU - Kusahara, Teruki

AU - Toyama, Hiroshi

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 - 2007/9

Y1 - 2007/9

N2 - A high specific capacitance was obtained for α-Co(OH)2 potentiostatically deposited onto a stainless-steel electrode in 0.1 M Co(NO3)2 electrolyte at -1.0 V vs. Ag/AgCl. The structure and surface morphology of the obtained α-Co(OH)2 were studied by using X-ray diffraction analysis and scanning electron microscopy. A network of nanolayered α-Co(OH)2 sheets was obtained; the average thickness of individual α-Co(OH)2 sheets was 10 nm, and the thickness of the deposit was several micrometers. The capacitive characteristics of the α-Co(OH)2 electrodes were investigated by means of cyclic voltammetry and constant current charge-discharge cycling in 1 M KOH electrolyte. A specific capacitance of 860 F g-1 was obtained for a 0.8 mg cm-2 α-Co(OH)2 deposit. The specific capacitance did not decrease significantly for the active mass loading range of 0.1-0.8 mg cm-2 due its layered structure, which allowed easy penetration of electrolyte and effective utilization of electrode material even at a higher mass. This opens up the possibility of using such materials in supercapacitor applications.

AB - A high specific capacitance was obtained for α-Co(OH)2 potentiostatically deposited onto a stainless-steel electrode in 0.1 M Co(NO3)2 electrolyte at -1.0 V vs. Ag/AgCl. The structure and surface morphology of the obtained α-Co(OH)2 were studied by using X-ray diffraction analysis and scanning electron microscopy. A network of nanolayered α-Co(OH)2 sheets was obtained; the average thickness of individual α-Co(OH)2 sheets was 10 nm, and the thickness of the deposit was several micrometers. The capacitive characteristics of the α-Co(OH)2 electrodes were investigated by means of cyclic voltammetry and constant current charge-discharge cycling in 1 M KOH electrolyte. A specific capacitance of 860 F g-1 was obtained for a 0.8 mg cm-2 α-Co(OH)2 deposit. The specific capacitance did not decrease significantly for the active mass loading range of 0.1-0.8 mg cm-2 due its layered structure, which allowed easy penetration of electrolyte and effective utilization of electrode material even at a higher mass. This opens up the possibility of using such materials in supercapacitor applications.

KW - Capacitance

KW - Cobalt hydroxide

KW - Potentiostatic deposition

KW - Supercapacitor

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DO - 10.1016/j.elecom.2007.06.041

M3 - Article

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SN - 1388-2481

VL - 9

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EP - 2319

JO - Electrochemistry Communications

JF - Electrochemistry Communications

IS - 9

ER -

Potentiostatically deposited nanostructured α-Co(OH)₂: A high performance electrode material for redox-capacitors

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