Effect of specific surface area on capacitance in asymmetric carbon/α-MnO2 supercapacitors

Alexander J. Roberts; Robert C.T. Slade

doi:10.1016/j.electacta.2010.01.004

Effect of specific surface area on capacitance in asymmetric carbon/α-MnO₂ supercapacitors

Alexander J. Roberts, Robert C.T. Slade

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

86 Citations (Scopus)

Abstract

α-MnO₂ has been made using a solid state synthesis and the specific surface area then modified through milling. The formation of α-MnO₂ (specific surface area 96 m² g^-1) has been studied by SEM and powder XRD prior to milling. Electrode films (cast using MnO₂, graphite and PVDF) have been investigated using N ₂ sorption at 77 K and show a more complex relationship than their parent oxides. Specific capacitances of 235 F g^-1 were observed in cyclic voltammetry studies in (NH₄)₂SO₄ (aq.) electrolyte. Good cyclability was observed in hybrid C/MnO₂ cells investigated through both galvanostatic and electrochemical impedance techniques. The specific capacitances of the cells were found to correlate with S_BET of the electrode films and not that of the parent MnO ₂ powders.

Original language	English
Pages (from-to)	7460-7469
Number of pages	10
Journal	Electrochimica Acta
Volume	55
Issue number	25
Early online date	14 Jan 2010
DOIs	https://doi.org/10.1016/j.electacta.2010.01.004
Publication status	Published - 30 Oct 2010
Externally published	Yes

Keywords

Hybrid
MnO
Solid state synthesis
Supercapacitor
Surface area

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

Access to Document

10.1016/j.electacta.2010.01.004

Cite this

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abstract = "α-MnO2 has been made using a solid state synthesis and the specific surface area then modified through milling. The formation of α-MnO2 (specific surface area 96 m2 g-1) has been studied by SEM and powder XRD prior to milling. Electrode films (cast using MnO2, graphite and PVDF) have been investigated using N 2 sorption at 77 K and show a more complex relationship than their parent oxides. Specific capacitances of 235 F g-1 were observed in cyclic voltammetry studies in (NH4)2SO4 (aq.) electrolyte. Good cyclability was observed in hybrid C/MnO2 cells investigated through both galvanostatic and electrochemical impedance techniques. The specific capacitances of the cells were found to correlate with SBET of the electrode films and not that of the parent MnO 2 powders.",

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AB - α-MnO2 has been made using a solid state synthesis and the specific surface area then modified through milling. The formation of α-MnO2 (specific surface area 96 m2 g-1) has been studied by SEM and powder XRD prior to milling. Electrode films (cast using MnO2, graphite and PVDF) have been investigated using N 2 sorption at 77 K and show a more complex relationship than their parent oxides. Specific capacitances of 235 F g-1 were observed in cyclic voltammetry studies in (NH4)2SO4 (aq.) electrolyte. Good cyclability was observed in hybrid C/MnO2 cells investigated through both galvanostatic and electrochemical impedance techniques. The specific capacitances of the cells were found to correlate with SBET of the electrode films and not that of the parent MnO 2 powders.

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