Fabrication of rGO/α-Fe2O3 electrodes: characterization and use in photoelectrocatalysis
| Autor: | Luiz Henrique Dall´Antonia, Mariana Gava Segatelli, Vanildo Souza Leão-Neto, Paulo Rogério Catarini da Silva, P. S. Parreira, Aruã C. da Silva, Luan Pereira Camargo, Marcelo Rodrigues da Silva Pelissari |
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| Přispěvatelé: | Universidade Estadual de Londrina (UEL), Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Photocurrent Thermogravimetric analysis Materials science Graphene Scanning electron microscope Oxide Infrared spectroscopy Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound symbols.namesake chemistry Chemical engineering law 0103 physical sciences symbols Electrical and Electronic Engineering Raman spectroscopy Visible spectrum |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2020-12-12T01:36:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 In the current study, the synthesis of hematite (α-Fe2O3) at different temperatures (750 and 900 °C), and reduced graphene oxide (rGO), obtained from an adaptation to the Hummers’s method, was evaluated. These materials were characterized by X-ray diffraction, Raman spectroscopy, Fourier-transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, among others. The deposition of samples on the conductive surface of tin-doped indium oxide coated glass substrate, was performed by the Layer-by-Layer technique. The films were prepared with 1- and 4-bilayers α-Fe2O3, using a cationic polyelectrolyte diallyldimethylammonium chloride (PDDA) or rGO. It was observed that the rGO/α-Fe2O3 films presented higher photocurrent and less resistivity when compared to the PDDA/α-Fe2O3 films. The largest photocurrent was obtained with the 4-bilayers rGO/α-Fe2O3 at 900 °C film, with 2.15 µA cm−2. In addition, a kinetic study for photoelectrocatalytic decolorization of the methylene blue dye under visible light was performed. The electrode that showed the greatest photoelectroactivity was the 4-bilayers rGO/α-Fe2O3 at 900 °C film, resulting in kobs = 11.90 × 10−3 min−1 and about 78% decolorization after 120 min. Departamento de Química Universidade Estadual de Londrina Instituto de Química Universidade de São Paulo Colégio Técnico Industrial Faculdade de Engenharia Universidade Estadual Paulista (UNESP) Departamento de Física Universidade Estadual de Londrina Colégio Técnico Industrial Faculdade de Engenharia Universidade Estadual Paulista (UNESP) |
| Databáze: | OpenAIRE |
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