Hydrogen production and simultaneous photoelectrocatalytic pollutant oxidation using a TiO2/WO3 nanostructured photoanode under visible light irradiation

Autor(es)

Guaraldo, T. T. ; Goncales, V. R. ; Silva, B. F. ; de Torresi, S. I. C. ; Zanoni, M. V. B.

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 765, p. 9-pg., 2016-03-15.

Resumo

Photoelectrochemical (PEC) hydrogen production and simultaneous organic waste degradation is a re-emerging field. The main challenge of this technique has been the synthesis of new photoanode materials that are active towards visible light. Coupling close band gap energy oxides can be used to obtain materials with new optical and electronic properties. For this purpose, Ti/TiO2/WO3 electrodes were prepared by electrochemical. anodization followed by templating and cathodic electrodeposition. The nanostructured bicomponent material was used as a photoanode for simultaneous hydrogen generation and organic dye degradation. A good photoactivity response (11 mA cm-(2)) was obtained under UV and visible light irradiation, when compared to pure TiO2 (8 mA cm-(2)). Optimization of photoelectrochemical conditions revealed that pH optimization had a major impact on H-2 production, resulting in satisfactory hydrogen generation efficiency (46%) and dye removal (100% discoloration and 85% reduction in TOC). A dye oxidation mechanism is proposed, based on LC-MS/MS analyses. The TiO2/WO3 photoanode could potentially be used for environmental remediation and hydrogen generation under solar irradiation. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/10449-7 - Avaliação da ocorrência, toxicidade/genotoxicidade e processos para degradação de corantes em efluentes e águas superficiais
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/17346-1 - Síntese e aplicação de filmes bicomponentes nanoestruturados de Ti/TiO2/WO3 por template e Si/TiO2/Pt por heterojunção em conversão de energia solar e remediação ambiental
• Beneficiário: Thais Tasso Guaraldo
• Modalidade de apoio: Bolsas no Brasil - Doutorado