Synthesis and characterization of a quaternary nanocomposite based on TiO2/CdS/rGO/Pt and its application in the photoreduction of CO2 to methane under visible light

Autor(es)

Benedetti, J. E. ^[1] ; Bernardo, D. R. ^[1] ; Morais, A. ^[1] ; Bettini, Jefferson ^[2] ; Nogueira, A. F. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas UNICAMP, Chem Inst, BR-13083970 Campinas, SP - Brazil

^[2] CNPEM, Natl Ctr Energy & Mat Res, Natl Nanotechnol Lab, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 5, n. 43, p. 33914-33922, 2015.
• Citações Web of Science: 28

Resumo

`Together we are stronger' In this work, the preparation of the quaternary nanocomposite TiO2/CdS/rGO/Pt is reported along with its application, for the first time, as a catalyst for the photocatalytic reduction of carbon dioxide (CO2) to methane (CH4). TiO2/CdS nanoparticles and Pt nanoparticle-decorated reduced graphene oxide sheets (rGO/Pt) were synthesized separately and characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), Raman spectroscopy, UV-vis spectroscopy and photoelectrochemical experiments. Hydrocarbon samples were collected and analysed using gas chromatography (GC). After 5 hours of illumination under visible light, 0.11 mmol of CH4 was produced at an average production rate of 0.0867 mmol h(-1), which is higher than the production of CH4 measured from the TiO2/CdS and the TiO2/CdS/Pt control samples. The photoelectrochemical experiments confirmed that the presence of rGO sheets in the nanocomposite enhanced the electrochemical and photocatalytic properties of the nanocomposite as a result of rapid electron transport and the inhibition of charge recombination. (AU)

• Processo FAPESP: 10/18656-1 - Preparação e caracterização de compósitos de nanopartículas de TiO2 e ZnO contendo materiais carbonáceos e sua aplicação em células solares
• Beneficiário: Andreia de Morais
• Modalidade de apoio: Bolsas no Brasil - Doutorado