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A study of the electrochemical behaviour of electrodes in operating solid-state supercapacitors

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Abstract
The electrochemical behaviour of electrodes and of complete solid-state supercapacitors has been studied by cyclic voltammetry (CV) and galvanostatic charge/discharge (CD) measurements using two independent electrochemical equipments. The first one controlled the execution of the test and recorded the voltage and current values of the complete supercapacitor while the other one recorded the potential changes of the single electrodes. In this work, two different types of capacitors were studied: (a) a symmetric supercapacitor using carbon electrodes, and (b) a hybrid (asymmetric) supercapacitor with ruthenium oxide/carbon in the positive electrode and carbon in the negative electrode. The studies evidenced that
in the symmetric capacitors the positive electrode controlled the capacitive performance and an optimal mass ratio from 1.2:1 to 1.3:1 between the positive and the negative electrodeswas found in the investigated conditions. For the hybrid supercapacitor itwas observed that the ruthenium-based
positive electrode influenced the capacitive performance of carbon-based negative electrode and that an accurate balance of carbon loading in the negative electrode was necessary.

Keywords: Electrochemical characterization; Polymer electrolyte; Positive electrode; Negative electrode; Supercapacitor

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Informasi Detail

Judul Seri

Electrochimica Acta

No. Panggil

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Penerbit

: Elsevier Ltd. All rights reserved., 2007

Deskripsi Fisik

Electrochimica Acta 53 (2007) 710–719

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

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

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