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Title: Graphite–castor oil polyurethane composite electrode surfaces – AFM morphological and electrochemical characterisation
Authors: Paquim, Ana Maria Chiorcea 
Diculescu, Victor Constantin 
Cervini, Priscila 
Cavalheiro, Eder Tadeu Gomes 
Brett, Ana Maria Oliveira 
Keywords: Graphite; Polyurethane; Composite electrode material; AFM; Voltammetry
Issue Date: 1-Oct-2014
Publisher: Elsevier
Citation: CHIORCEA-PAQUIM, Ana-Maria [et. al] - Graphite–castor oil polyurethane composite electrode surfaces – AFM morphological and electrochemical characterisation. "Journal of Electroanalytical Chemistry". ISSN 1572-6657. Vol. 731 (2014) p. 172–178
Serial title, monograph or event: Journal of Electroanalytical Chemistry
Volume: 731
Abstract: Graphite–castor oil polyurethane composite electrodes with different graphite weight percentages, 30–70% graphite–polyurethane w w−1, were morphologically studied by atomic force microscopy (AFM) and voltammetry. AFM images and r.m.s. roughness measurements demonstrated that the polyurethane roughness decreased with increasing the graphite content, composites of 50% and 60% graphite–polyurethane w w−1 showing the smother electrode surface. The electrochemical characterisation was performed in solutions of K4Fe(CN)6 by cyclic voltammetry and impedance spectroscopy. For compositions of 60% and 70% graphite–polyurethane w w−1, the cyclic voltammetry results showed the K4Fe(CN)6 system reversibility. The charge transfer resistance, determined from the EIS spectra, decreased significantly with increasing the graphite/polyurethane ratio, and the capacitance increased for higher graphite percentages. AFM and voltammetric results enable to conclude that 60% graphite–polyurethane w w−1 was the optimal composition for the preparation of the graphite–polyurethane composite electrodes.
ISSN: 1572-6657
DOI: 10.1016/j.jelechem.2014.07.027
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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