ANALYTICAL APPLICATIONS OF Cu@PtPd/C NANOPARTICLES FOR THE QUANTIFICATION OF HYDROGEN PEROXIDE

FUERTES V. C.; ALVAREZ A.E.; GUTIERREZ F. A.; MONTEMERLO A. E.; RUBIANES M. D.; GIORDANA I. S.; SIEBEN J.M.; RIVAS G. A.; FUERTES V. C.; ALVAREZ A.E.; GUTIERREZ F. A.; MONTEMERLO A. E.; RUBIANES M. D.; GIORDANA I. S.; SIEBEN J.M.; RIVAS G. A.

MICROCHEMICAL JOURNAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2018 vol. 141 p. 240 - 246

0026-265X

This work reports a non-enzymatic amperometric sensor for hydrogenperoxide based on the use of a glassy carbon composite electrode (GCPE)modified with core-shell Cu@PtPd/C nanoparticles. Cu@PtPd/C presents animportant electrocatalytic activity towards hydrogen peroxide reduction. Thecomparison of the sensitivities and the charge transfer resistances for hydrogenperoxide at GCPE modified with 5.0 % w/w Pt/C, Pd/C, Pd/C + Pt/C andCu@PtPd/C demonstrate a clear synergism on the catalytic reduction of hydrogenperoxide at -0.100 V when having Pt, Pd and Cu incorporated in the core-shellnanostructure. The best compromise between sensitivity, reproducibility andresponse time was reached with 20.0 % w/w Cu@PtPd/C. For the selected sensor(GCPE/Cu@PtPd/C 20.0 % w/w) the analytical parameters are highly competitivecompared to similar devices reported in the last years, with a linear relationship between current and hydrogen peroxide concentration between 5.0x10-6 and 2.5x10-4 M, sensitivity of (5.30 ±0.09) x 105 μAM-1cm-2 (r2= 0.998) and detection limit of (3.7 ±0.5) x 10-7 M. The resulting sensing platform was successfully used for the quantification of hydrogen peroxide in a mouth-wash sample.