e-journal

Effect of pH-induced chemical modification of hydrothermally reduced graphene oxide on supercapacitor performance

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Abstract.
Three kinds of reduced graphene oxides are prepared by hydrothermal reduction under different pH
conditions and their pseudocapacitive performances are evaluated using full-cell supercapacitor devices.
The pH values are found to have great influence on the performance of the supercapacitors, achieving the
highest specific capacitance value reported for hydrothermal reduced graphene oxide supercapacitors.
Acidic and neutral media yield reduced graphene oxides with more oxygen-functional groups and lower
surface areas but with broader pore size distributions than those in basic medium. The graphene produced
in the basic solution (nitrogen-doped graphene) presents mainly electrochemical double layer
(ECDL) behavior with specific capacitance of 185 F g
1, while the graphene produced under neutral or
acidic conditions show both ECDL and pseudocapacitive behavior with specific capacitance of 225 F g
-1
(acidic) and 230 F g-
1 (neutral), respectively, at a constant current density of 1 A g
1. The influence of pH
on cycling performance and electrochemical impedance of the supercapacitive devices is also presented.

Keywords: Supercapacitor, Graphene, pH, Specific capacitance, Hydrothermal, functionalization

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Informasi Detail

Judul Seri

Journal of Power Sources

No. Panggil

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Penerbit

New York : Elsevier B.V.., 2013

Deskripsi Fisik

Journal of Power Sources 233 (2013) 313-319

Bahasa

English

ISBN/ISSN

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Klasifikasi

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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

FISIKA MATERIAL

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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