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

C. GOMEZ; A. SILVA; M. STRUMIA; L. AVALLE; M. ROJAS

Nanoscale

Royal Society of Chemistry

Año: 2017 vol. 9 p. 11170 - 11170

2040-3372

raphitic carbon nitride (g-C3N4) was synthesized from a low-cost precursor by means of a thermalprocess. The product was characterized by several spectroscopic techniques and the crystallinity was analyzedby X-ray diffraction. In the manufacture of the sensor, g-C3N4 was chemically exfoliated and a filmwas placed on the surface of a Highly Oriented Pyrolytic Graphite (HOPG). We compared the electrocatalyticactivities of g-C3N4/HOPG and pristine HOPG surfaces as sensors for H2O2 quantification inbuffer solution at pH 7. The results indicate that the surface of g-C3N4/HOPG exhibits striking analyticalstability as well as reproducibility, enabling a reliable and sensitive determination within the 0.12?120 μMinterval with a detection limit of 0.12 μM. These results suggest that this g-C3N4 film is a really particularlygood nano-structured material to be applied as a biosensor. Chemical and physical factors are responsiblefor the outstanding electrocatalytic activity observed. Th