Self-discharge of AC/AC electrochemical capacitors in salt aqueous electrolyte
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Título: | Self-discharge of AC/AC electrochemical capacitors in salt aqueous electrolyte |
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Autor/es: | García Cruz, Leticia | Ratajczak, Paula | Iniesta, Jesus | Montiel, Vicente | Béguin, François |
Grupo/s de investigación o GITE: | Electroquímica Aplicada y Electrocatálisis |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Palabras clave: | Self-discharge | AC/AC electrochemical capacitor | Aqueous lithium sulfate electrolyte | Diffusion-controlled mechanism | Activation-controlled mechanism |
Área/s de conocimiento: | Química Física |
Fecha de publicación: | 1-jun-2016 |
Editor: | Elsevier |
Cita bibliográfica: | Electrochimica Acta. 2016, 202: 66-72. doi:10.1016/j.electacta.2016.03.159 |
Resumen: | The self-discharge (SD) of electrochemical capacitors based on activated carbon electrodes (AC/AC capacitors) in aqueous lithium sulfate was examined after applying a three-hour cell potential hold at Ui values from 1.0 to 1.6 V. The leakage current measured during the potentiostatic period as well as the amplitude of self-discharge increased with Ui; the cell potential drop was approximately doubled by 10 °C increase of temperature. The potential decay of both negative and positive electrodes was explored separately, by introducing a reference electrode and it was found that the negative electrode contributes essentially to the capacitor self-discharge. A diffusion-controlled mechanism was found at Ui ≤ 1.4 V and Ui ≤ 1.2 V for the positive and negative electrodes, respectively. At higher Ui of 1.6 V, both electrodes display an activation-controlled mechanism due to water oxidation and subsequent carbon oxidation at the positive electrode and water or oxygen reduction at the negative electrode. |
Patrocinador/es: | The authors are grateful to the Foundation for Polish Science (FNP) for funding the ECOLCAP project within the WELCOME program, co-financed from European Union Regional Development Fund. LGC acknowledges the Spanish MINECO for funding her PhD mobility grant EEBB-1-13-06222 for the research stay at Poznan University of Technology. |
URI: | http://hdl.handle.net/10045/54232 |
ISSN: | 0013-4686 (Print) | 1873-3859 (Online) |
DOI: | 10.1016/j.electacta.2016.03.159 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2016 Elsevier Ltd. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.electacta.2016.03.159 |
Aparece en las colecciones: | INV - LEQA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2016_Garcia-Cruz_etal_ElectActa_final.pdf | Versión final (acceso restringido) | 1,2 MB | Adobe PDF | Abrir Solicitar una copia |
2016_Garcia-Cruz_etal_ElectActa_accepted.pdf | Accepted Manuscript (acceso abierto) | 1,37 MB | Adobe PDF | Abrir Vista previa |
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