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Supercapacitance behavior of porous oxide layer grown on 302 type stainless steel substrate

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Abstract.
Nano-porous oxide layers on the surface of 302-type stainless steel were synthesized by galvanostatic
anodization process carried out at two current densities, 7 and 15 mA cm
-2 for the time periods of 15 and
30 min. A relatively thinner (~300 nm) and compact oxide layer formed when anodization was performed
at a current density of 7 mA cm-
2. However, with increase in anodization current density, the
oxide layer not only grew thicker but also changed in morphology. It was found to be about 0.7 and 1.2
μm after 15 and 30 minutes of anodization at 15 mA cm
-2, respectively. The XRD analysis of the oxide
layer suggested the formation of hematite ((Fe, Cr)2O3) and spinel ((Ni, Cr, Fe)3O4) phases. The cyclic
voltammetry and galvanostatic charge-discharge studies (1 M Li2SO4) suggested that the nature of the
capacitance of the anodized stainless steel electrodes were of predominantly electric double layer (EDL)
type together with some pseudocapacitance like behavior. The specific capacitance obtained was higher
for the sample anodized at higher current density (15 mA cm
-2) than that of the sample anodized at
lower current density (7 mA cm
-2). The results were also complimented by electrochemical impedance
spectroscopic (EIS) analysis.

Keywords: Stainless steel; Nano-porous; Electrochemical capacitor; Anodization; Pseudocapacitor; Redox

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Ketersediaan

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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 236 (2013) 103-111

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

236 (2013)

Subjek

PSEUDOKAPASITOR

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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