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The Origin of High Electrocatalytic Activity of Hydrogen Peroxide Reduction Reaction by g-C3N4/HOPG Sensor

Abstract

Graphitic carbon nitride (g-C3N4) was synthesized from a low-cost precursor by means of a thermal process. The product was characterized by several spectroscopic techniques and crystallinity was analyzed by X-ray diffraction. In the manufacture of the sensor, the g-C3N4 was chemically exfoliated and a film was placed on the surface of a Highly Oriented Pyrolytic Graphite (HOPG). We compared the electrocatalytic activities of g-C3N4/HOPG and pristine HOPG surfaces as sensors for H2O2 quantification in buffer solution at pH 7. Results indicate that the surface of g-C3N4/HOPG exhibits striking analytical stability as well as reproducibility, enabling a reliable and sensitive determination within 0.12 - 120 M interval with a detection limit of 0.12 M. These results suggest that this g-C3N4 film is a really particularly good nano-structured material to be applied as biosensor. Chemical and physical factors are responsible for the outstanding electrocatalytic activity observed. The N in the g-C3N4 allows huge uptake of H2O2 through hydrogen-bonding interaction and the change in the electronic structure since HOPG/g-C3N4 heterojunction favors the charge transference process through the interface.

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Publication details

The article was received on 17 Apr 2017, accepted on 12 Jul 2017 and first published on 14 Jul 2017


Article type: Paper
DOI: 10.1039/C7NR02736B
Citation: Nanoscale, 2017, Accepted Manuscript
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    The Origin of High Electrocatalytic Activity of Hydrogen Peroxide Reduction Reaction by g-C3N4/HOPG Sensor

    C. Gomez, A. M. Silva, M. C. Strumia, L. Avalle and M. I. ROJAS, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR02736B

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