Abstract
The authors describe a platform for the electrochemical reduction of oxygen. It is based on the use of a glassy carbon electrode (GCE) that was modified in a single-step microwave assisted reaction with a N4-macrocycle containing iron(III) (FeN4) and with reduced graphene oxide. The FeN4/rGO composite was characterized by cyclic voltammetry, differential pulse voltammetry, and scanning electrochemical microscopy (SECM). Cyclic voltammetry showed the composite to enable efficient reduction of O2 at a very low overpotential (−0.05 V vs. Ag/AgCl). SECM measurements were carried out to map (in the redox competition mode) the activity of a GCE microelectrode modified with FeN4/rGO. Under optimized conditions, the response to dissolved O2 ranges from 0.8 up to 25 mg⋅L‾1, and the limit of detection is 0.2 mg⋅L‾1.
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Acknowledgments
The authors are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), INCT-Bioanalitica and Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA) for financial support and fellowships. SMS is a scholarship student from CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico and INCT-Bioanalítica, Instituto Nacional de Ciência e Tecnologia em Bioanalítica – Brazil.
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Silva, S.M., Aguiar, L.F., Carvalho, R.M.S. et al. A glassy carbon electrode modified with an iron N4-macrocycle and reduced graphene oxide for voltammetric sensing of dissolved oxygen. Microchim Acta 183, 1251–1259 (2016). https://doi.org/10.1007/s00604-016-1750-6
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DOI: https://doi.org/10.1007/s00604-016-1750-6