e-journal

Effects of substrates on the capacitive performance of RuOx·nH2O and activated carbon–RuOx electrodes for supercapacitors

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Abstract
The electrochemical energy storage and delivery on the electrodes composed of hydrous ruthenium oxide (RuOx·nH2O) or activated carbon–hydrous ruthenium oxide (AC–RuOx) composites are found to strongly depend on the substrate employed. The contact resistance at the active material–graphite interface is much lower than that at the active material–stainless steel (SS) mesh interface. Thin films of gold plus RuOx·nH2O deposited on SS meshes (RuOx/Au/SS) are found to greatly improve the poor contact between SS meshes and electrode materials. The maximum specific capacitance (CS,RuOx) of RuOx·nH2O, 1580 F g−1 (measured at 1mVs−1), very close to the theoretic value, was obtained from an AC–RuOx/RuOx/Au/SS electrode with 10 wt.% sol–gel-derived RuOx·nH2O annealed in air at 200 ◦C for 2 h. The highly electrochemical reversibility, high-power characteristics, good stability, and improved frequency response of this AC–RuOx/RuOx/Au/SS electrode demonstrate its promising application potential in supercapacitors. The ultrahigh specific capacitance of RuOx·nH2Oprobably results from the uniform size distribution of RuOx·nH2O nanoparticles, ranged from 1.5 to 3 nm which is clearly observed from the high-resolution
transmission electron microscopy (HRTEM).
Keywords: RuOx·nH2O nanoparticles; Substrate; Activated carbon; Supercapacitor

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2004

Deskripsi Fisik

Electrochimica Acta 49 (2004) 3469–3477

Bahasa

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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Pernyataan Tanggungjawab

yuli/agus

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