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Electrochemical performance of activated screen printed carbon electrodes for hydrogen peroxide and phenol derivatives sensing

Mostrar el registro sencillo del ítem González Sánchez, María Isabel Gómez Monedero, Beatriz Agrisuelas, Jerónimo Iniesta, Jesús Valero, Edelmira 2019-03-21T11:28:08Z 2019-03-21T11:28:08Z 2019
dc.identifier.citation Journal of Electroanalytical Chemistry es_ES
dc.identifier.issn 1572-6657
dc.description.abstract Screen-printed carbon electrodes (SPCEs) are widely used for the electroanalysis of a plethora of organic and inorganic compounds. These devices offer unique properties to address electroanalytical chemistry challenges and can successfully compete in numerous aspects with conventional carbon-based electrodes. However, heterogeneous kinetics on SPCEs surfaces is comparatively sluggish, which is why the electrochemical activation of inks is sometimes required to improve electron transfer rates and to enhance sensing performance. In this work, SPCEs were subjected to different electrochemical activation methods and the response to H2O2 electroanalysis was used as a testing probe. Changes in topology, surface chemistry and electrochemical behavior to H2O2 oxidation were performed by SEM, XPS, cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. The combination of electrochemical activation methods using H2SO4 and H2O2 proved particularly effective. A reduction in charge transfer resistance, together with functionalization with some carbon-oxygen groups on carbon ink surfaces, were likely responsible for such electrochemical improvement. The use of a two-step protocol with 0.5 M H2SO4 and 10 mM H2O2 under potential cycling conditions was the most effective activation procedure investigated herein, and gave rise to 518-fold higher sensitivity than that obtained for the untreated SPCEs upon H2O2 electrooxidation. The electrochemical behavior of acetaminophen, hydroquinone and dopamine is also shown,as a proof of concept upon the optimum activated SPCEs. es_ES
dc.format application/pdf es_ES
dc.language.iso en es_ES
dc.publisher Elsevier es_ES
dc.rights info:eu-repo/semantics/openAccess es_ES
dc.subject Screen-printed carbon electrodes es_ES
dc.subject Hydrogen peroxide es_ES
dc.subject Sulfuric acid es_ES
dc.subject Electrochemical activation es_ES
dc.subject Sensor es_ES
dc.subject Phenolic compounds es_ES
dc.title Electrochemical performance of activated screen printed carbon electrodes for hydrogen peroxide and phenol derivatives sensing es_ES
dc.type info:eu-repo/semantics/article es_ES
dc.identifier.DOI 10.1016/j.jelechem.2019.03.026

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