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

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a b s t r a c t
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 96m2 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
N2 sorption at 77K 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 MnO2 powders.
Keywords: Supercapacitor, MnO2, Surface area, Hybrid, Solid state synthesis

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2010

Deskripsi Fisik

Electrochimica Acta 55 (2010) 7460–7469

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English

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA KARBON

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yuli/agus

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