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

AuthorsDi Blasi, Alessandra; Di Blasi, Orazio; Briguglio, N.; Aricò, Antonino Salvatore; Sebastián del Río, David ; Lázaro Elorri, María Jesús ; Monforte, G.; Antonucci, Vincenzo
KeywordsVanadium redox flow battery
Electrochemical activity
Carbon nanofiber
Carbon felt
Rod graphite
Carbon paper
Issue Date23-Nov-2012
CitationJournal of Power Sources 227: 15-23 (2013)
AbstractSeveral 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
Description9 páginas.- 1 tabla.- 18 figuras.
Publisher version (URL)http://dx.doi.org/10.1016/j.jpowsour.2012.10.098
Appears in Collections:(ICB) Artículos
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