Enhancement of capacitance by electrochemical oxidation of nanodiamond derived carbon nano-onions

Yiyang Liu; Doo Young Kim

doi:10.1016/j.electacta.2014.07.040

Enhancement of capacitance by electrochemical oxidation of nanodiamond derived carbon nano-onions

Yiyang Liu, Doo Young Kim

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

35 Scopus citations

Abstract

Electrode responsiveness and electrochemical capacitance behavior of nanodiamond-derived carbon nano-onions (N-CNOs) were studied. N-CNOs were prepared by thermal annealing of nanodiamond powders. A thin film of N-CNOs was mounted on glassy carbon (GC) current collector and showed an excellent electrochemical behavior with rectangular voltammetric curves as well as great scan rate dependence of capacitance. The capacitance showed negligible drops over a wide range of scan rates (50 mV/s - 5 V/s) in both KCl and H ₂SO₄. This excellent capacitive behavior was attributed to good electrical conductivity and mesoporous nature of N-CNOs. In order to further enhance capacitance, electrochemical oxidation of N-CNOs was carried out by iterating anodic cycling in acidic electrolytes. The capacitance enhancement of oxidized N-CNOs was probed by cyclic voltammetry as well as galvanostatic charging-discharging measurement. This study demonstrates that electrochemical oxidation can be an effective method to improve capacitance and energy density of carbon nanomaterials while maintaining a good scan rate performance.

Original language	English
Pages (from-to)	82-87
Number of pages	6
Journal	Electrochimica Acta
Volume	139
DOIs	https://doi.org/10.1016/j.electacta.2014.07.040
State	Published - Sep 1 2014

Bibliographical note

Funding Information:
This research was supported by the University of Kentucky faculty start-up grant. The authors acknowledge NSF for the use of the recently installed XPS at the University of Kentucky. The purchase of the XPS was supported by the funds from NSF EPSCoR (grant No. 0814194).

Funding

This research was supported by the University of Kentucky faculty start-up grant. The authors acknowledge NSF for the use of the recently installed XPS at the University of Kentucky. The purchase of the XPS was supported by the funds from NSF EPSCoR (grant No. 0814194).

Funders	Funder number
University of Kentucky
Kansas NSF EPSCoR	0814194

Keywords

capacitance
carbon nano-onions
electrochemical oxidation
nanodiamond

ASJC Scopus subject areas

General Chemical Engineering
Electrochemistry

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10.1016/j.electacta.2014.07.040

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title = "Enhancement of capacitance by electrochemical oxidation of nanodiamond derived carbon nano-onions",

abstract = "Electrode responsiveness and electrochemical capacitance behavior of nanodiamond-derived carbon nano-onions (N-CNOs) were studied. N-CNOs were prepared by thermal annealing of nanodiamond powders. A thin film of N-CNOs was mounted on glassy carbon (GC) current collector and showed an excellent electrochemical behavior with rectangular voltammetric curves as well as great scan rate dependence of capacitance. The capacitance showed negligible drops over a wide range of scan rates (50 mV/s - 5 V/s) in both KCl and H 2SO4. This excellent capacitive behavior was attributed to good electrical conductivity and mesoporous nature of N-CNOs. In order to further enhance capacitance, electrochemical oxidation of N-CNOs was carried out by iterating anodic cycling in acidic electrolytes. The capacitance enhancement of oxidized N-CNOs was probed by cyclic voltammetry as well as galvanostatic charging-discharging measurement. This study demonstrates that electrochemical oxidation can be an effective method to improve capacitance and energy density of carbon nanomaterials while maintaining a good scan rate performance.",

keywords = "capacitance, carbon nano-onions, electrochemical oxidation, nanodiamond",

author = "Yiyang Liu and Kim, {Doo Young}",

note = "Funding Information: This research was supported by the University of Kentucky faculty start-up grant. The authors acknowledge NSF for the use of the recently installed XPS at the University of Kentucky. The purchase of the XPS was supported by the funds from NSF EPSCoR (grant No. 0814194). ",

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doi = "10.1016/j.electacta.2014.07.040",

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AU - Liu, Yiyang

AU - Kim, Doo Young

N1 - Funding Information: This research was supported by the University of Kentucky faculty start-up grant. The authors acknowledge NSF for the use of the recently installed XPS at the University of Kentucky. The purchase of the XPS was supported by the funds from NSF EPSCoR (grant No. 0814194).

PY - 2014/9/1

Y1 - 2014/9/1

N2 - Electrode responsiveness and electrochemical capacitance behavior of nanodiamond-derived carbon nano-onions (N-CNOs) were studied. N-CNOs were prepared by thermal annealing of nanodiamond powders. A thin film of N-CNOs was mounted on glassy carbon (GC) current collector and showed an excellent electrochemical behavior with rectangular voltammetric curves as well as great scan rate dependence of capacitance. The capacitance showed negligible drops over a wide range of scan rates (50 mV/s - 5 V/s) in both KCl and H 2SO4. This excellent capacitive behavior was attributed to good electrical conductivity and mesoporous nature of N-CNOs. In order to further enhance capacitance, electrochemical oxidation of N-CNOs was carried out by iterating anodic cycling in acidic electrolytes. The capacitance enhancement of oxidized N-CNOs was probed by cyclic voltammetry as well as galvanostatic charging-discharging measurement. This study demonstrates that electrochemical oxidation can be an effective method to improve capacitance and energy density of carbon nanomaterials while maintaining a good scan rate performance.

AB - Electrode responsiveness and electrochemical capacitance behavior of nanodiamond-derived carbon nano-onions (N-CNOs) were studied. N-CNOs were prepared by thermal annealing of nanodiamond powders. A thin film of N-CNOs was mounted on glassy carbon (GC) current collector and showed an excellent electrochemical behavior with rectangular voltammetric curves as well as great scan rate dependence of capacitance. The capacitance showed negligible drops over a wide range of scan rates (50 mV/s - 5 V/s) in both KCl and H 2SO4. This excellent capacitive behavior was attributed to good electrical conductivity and mesoporous nature of N-CNOs. In order to further enhance capacitance, electrochemical oxidation of N-CNOs was carried out by iterating anodic cycling in acidic electrolytes. The capacitance enhancement of oxidized N-CNOs was probed by cyclic voltammetry as well as galvanostatic charging-discharging measurement. This study demonstrates that electrochemical oxidation can be an effective method to improve capacitance and energy density of carbon nanomaterials while maintaining a good scan rate performance.

KW - capacitance

KW - carbon nano-onions

KW - electrochemical oxidation

KW - nanodiamond

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Enhancement of capacitance by electrochemical oxidation of nanodiamond derived carbon nano-onions

Abstract

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Keywords

ASJC Scopus subject areas

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