FAD-modified SiO2/ZrO2/C ceramic electrode for electrocatalytic reduction of bromate and iodate

Author(s)

Marafon, Eduardo ^[1] ; Kubota, Lauro T. ^[1] ; Gushikem, Yoshitaka ^[1]

Affiliation

^[1] Univ Estadual Campinas, Inst Quim, BR-13084971 Campinas, SP - Brazil

• Document type: Journal article
• Source: Journal of Solid State Electrochemistry; v. 13, n. 3, p. 377-383, MAR 2009.
• Web of Science Citations: 22

Abstract

SiO(2)/ZrO(2)/C carbon ceramic material with composition (in wt%) SiO(2) = 50, ZrO(2) = 20, and C = 30 was prepared by the sol-gel-processing method. A high-resolution transmission electron microscopy image showed that ZrO(2) and the graphite particles are well dispersed inside the matrix. The electrical conductivity obtained for the pressed disks of the material was 18 S cm(-1), indicating that C particles are also well interconnected inside the solid. An electrode modified with flavin adenine dinucleotide (FAD) prepared by immersing the solid SiO(2)/ZrO(2)/C, molded as a pressed disk, inside a FAD solution (1.0 x 10(-3) mol L(-1)) was used to investigate the electrocatalytic reduction of bromate and iodate. The reduction of both ions occurred at a peak potential of -0.41 V vs. the saturated calomel reference electrode. The linear response range (lrr) and detection limit (dl) were: BrO(3)(-), lrr = 4.98 x 10(-5) - 1.23 x 10(-3) mol L(-1) and dl = 2.33 mu mol L(-1); IO(3)(-), lrr= 4.98 x 10(-5) up to 2.42 x 10(-3) and dl = 1.46 mu mol L(-1) for iodate. (AU)

• FAPESP's process: 00/11103-5 - Porous materials: preparation, properties and applications
• Grantee: Yoshitaka Gushikem
• Support Opportunities: Research Projects - Thematic Grants