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

Please use this identifier to cite or link to this item: http://hdl.handle.net/10045/90510
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Title: Electrochemical performance of activated screen printed carbon electrodes for hydrogen peroxide and phenol derivatives sensing
Authors: González-Sánchez, María I. | Gómez-Monedero, Beatriz | Agrisuelas, Jerónimo | Iniesta, Jesus | Valero, Edelmira
Research Group/s: Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Screen-printed carbon electrodes | Hydrogen peroxide | Sulfuric acid | Electrochemical activation | Sensor | Phenolic compounds
Knowledge Area: Química Física
Issue Date: 15-Apr-2019
Publisher: Elsevier
Citation: Journal of Electroanalytical Chemistry. 2019, 839: 75-82. doi:10.1016/j.jelechem.2019.03.026
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.
Sponsor: This work was funded by the Spanish Ministry of Economy and Competitiveness (MINECO, http://www.mineco.gob.es/portal/site/mineco/idi), Projects No. BFU2016-75609-P (AEI/FEDER, UE) and CTQ2016-76231-C2-2-R, and by the Junta de Comunidades de Castilla-La Mancha (Spain), Project No. SBPLY/17/180501/000276/2 (cofunded with FEDER funds, EU). BGM is a post-doctoral research fellow of the Youth Employment Initiative (JCCM, Spain, cofunded with ESF funds, EU).
URI: http://hdl.handle.net/10045/90510
ISSN: 1572-6657 (Print) | 1873-2569 (Online)
DOI: 10.1016/j.jelechem.2019.03.026
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2019 Elsevier B.V.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.jelechem.2019.03.026
Appears in Collections:INV - LEQA - Artículos de Revistas

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