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https://hdl.handle.net/10316/27823
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. | URI: | https://hdl.handle.net/10316/27823 | 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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Graphite–castor oil polyurethane composite.pdf | 1.33 MB | Adobe PDF | View/Open |
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