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Investigation of several graphite-based electrodes for vanadium redox flow cell

Authors :: O. Di Blasi
María Jesús Lázaro
Antonino S. Aricò
Giuseppe Monforte
David Sebastián
N. Briguglio
Vincenzo Antonucci
A. Di Blasi
Source :: Journal of power sources, 227 (2013): 15–23. doi:10.1016/j.jpowsour.2012.10.098, info:cnr-pdr/source/autori:A. Di Blasi a, O. Di Blasi a, N. Briguglio a, A.S. Aricò a, D. Sebastián b, M.J. Lázaro b, G. Monforte a, V. Antonucci a/titolo:Investigation of several graphite-based electrodes for vanadium redox flow cell/doi:10.1016%2Fj.jpowsour.2012.10.098/rivista:Journal of power sources (Print)/anno:2013/pagina_da:15/pagina_a:23/intervallo_pagine:15–23/volume:227, Digital.CSIC. Repositorio Institucional del CSIC, instname
Publication Year :: 2013
Publisher :: Elsevier BV, 2013.
Abstract: 9 páginas.- 1 tabla.- 18 figuras.<br />Several graphite-based electrodes are investigated for vanadium ﬂow battery applications. These materials are characterized both as-received and after chemical or electrochemical treatments in order to vary the content of oxygen functional groups on the electrode surface. The surface properties of the samples are investigated by X-ray photoelectron spectroscopy. Electrochemical performance is evaluated by cyclic voltammetry and electrochemical impedance spectroscopy measurements in a three electrode half-cell. The chemical treatment with HNO3 causes a cleaning of the electrode surface from adsorbed oxygen species or labile bonded functional groups in highly graphitic samples. Whereas, carbonaceous materials characterized by smaller graphitic domains or a higher degree of amorphous carbon show an increase of oxygen functional groups upon chemical and electrochemical pre-treatments. In both cases, an increase of oxygen species content on the surface above 5% causes a decrease of electrochemical performance for the redox battery determined by an increase of ohmic and charge transfer resistance<br />Authors from CNR-ITAE acknowledge the financial support from “Ministero dello Sviluppo Economico – Accordo di Programma MSE-CNR per la Ricerca del Sistema elettrico Nazionale”.