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

Autor(es)

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

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: Journal of Solid State Electrochemistry; v. 13, n. 3, p. 377-383, MAR 2009.
• Citações Web of Science: 22

Resumo

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)

• Processo FAPESP: 04/00919-5 - Materiais híbridos SiO2/grafite/ ZrO2 e SiO2/grafite/Zr(HPO4)2 obtidos via processamento sol-gel: uma nova família de materiais cerâmicos eletricamente condutores
• Beneficiário: Eduardo Marafon
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 00/11103-5 - Materiais porosos: preparação, propriedades e aplicações
• Beneficiário: Yoshitaka Gushikem
• Modalidade de apoio: Auxílio à Pesquisa - Temático