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The origin of high electrocatalytic activity of hydrogen peroxide reduction reaction by a g-C3N4/HOPG sensor

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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 the crystallinity was analyzed by X-ray diffraction. In the manufacture of the sensor, 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. The results indicate that the surface of g-C3N4/HOPG exhibits striking analytical stability as well as reproducibility, enabling a reliable and sensitive determination within the 0.12–120 μM interval with a detection limit of 0.12 μM. These results suggest that this g-C3N4 film is a really particularly good nano-structured material to be applied as a 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 the hydrogen-bonding interaction and the change in the electronic structure since the HOPG/g-C3N4 heterojunction favors the charge transfer process through the interface.

Graphical abstract: The origin of high electrocatalytic activity of hydrogen peroxide reduction reaction by a g-C3N4/HOPG sensor

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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, Advance Article
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    The origin of high electrocatalytic activity of hydrogen peroxide reduction reaction by a g-C3N4/HOPG sensor

    C. G. Gomez, A. M. Silva, M. C. Strumia, L. B. Avalle and M. I. Rojas, Nanoscale, 2017, Advance Article , DOI: 10.1039/C7NR02736B

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