NADH Electrooxidation Using Bis(1,10-phenanthroline-5,6-dione) (2,2'-bipyridine)ruthenium(II)-Exchanged Zirconium Phosphate Modified Carbon Paste Electrodes |
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Authors: | Santiago Mitk'el B Vélez Meredith M Borrero Solmarie Díaz Agustín Casillas Craig A Hofmann Cristina Guadalupe Ana R Colón Jorge L |
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Institution: | Department of Chemistry, P. O. Box 23346, University of Puerto Rico, Río Piedras, P. R. 00931-3346, USA. |
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Abstract: | We present a carbon paste electrode (CPE) modified using the electron mediator bis(1,10‐phenanthroline‐5,6‐dione)(2,2′‐bipyridine)ruthenium(II) (Ru(phend)2bpy]2+) exchanged into the inorganic layered material zirconium phosphate (ZrP). X‐Ray powder diffraction showed that the interlayer distance of ZrP increases upon Ru(phend)2bpy]2+ intercalation from 10.3 Å to 14.2 Å. The UV‐vis and IR spectroscopies results showed the characteristic peaks expected for Ru(phend)2bpy]2+. The UV‐vis spectrophotometric results indicate that the Ru(phend)2bpy]2+ concentration inside the ZrP layers increased as a function of the loading level. The exchanged Ru(phend)2bpy]2+ exhibited luminescence even at low concentration. Modified CPEs were constructed and analyzed using cyclic voltammetry. The intercalated mediator remained electroactive within the layers (E°′=–38.5 mV vs. Ag/AgCl, 3.5 M NaCl) and electrocatalysis of NADH oxidation was observed. The kinetics of the modified CPE shows a Michaelis–Menten behavior. This CPE was used for the oxidation of NADH in the presence of Bakers' yeast alcohol dehydrogenase. A calibration plot for ethanol is presented. |
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Keywords: | Zirconium phosphate Modified carbon paste electrode Ruthenium complex mediator NADH electrooxidation |
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