Contribution of CuxO distribution, shape and ratio on TiO2 nanotubes to improve methanol production from CO2 photoelectroreduction
| Autor: | Juliana Ferreira de Brito, Murilo Santos Pacheco, Christiane de Arruda Rodrigues, Juliana de Almeida |
|---|---|
| Přispěvatelé: | Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Nanotube
Materials science Scanning electron microscope Electrolyte design Oxide Nanoparticle 02 engineering and technology Electrolyte CO2 photoelectroreduction p-n heterojunction 010402 general chemistry Electrochemistry 01 natural sciences Methanol formation Hybrid TiO2-CuxO photocatalysts chemistry.chemical_compound X-ray photoelectron spectroscopy General Materials Science Electrical and Electronic Engineering 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry Chemical engineering Methanol 0210 nano-technology |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2020-12-12T01:31:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 Many studies are focused on the development of materials for converting carbon dioxide into multicarbon oxygenates such as methanol and ethanol, because of their higher energy density and wider applicability. In this work, TiO2 nanotubes (NT/TiO2) were modified with CuxO nanoparticles in order to investigate the contribution of different ratio of Cu2O/CuO and its distribution over NT/TiO2 for CO2 photoelectro-conversion to methanol. The photoelectrodes were built by anodization process to obtain NT/TiO2 layer, and the decoration with CuxO hybrid system was carried out by electrodeposition process, using Na2SO4 or acid lactic as electrolyte, followed by annealing at different temperatures. X-ray photoelectron spectroscopy analysis revealed the predominance of Cu+1 and Cu+2 at 150 °C and 300 °C, respectively. X-ray diffraction and scanning electron microscopy indicated that under lactic acid solution, the oxide nanoparticles exhibited small size, cubic shape, and uniform distribution on the nanotube wall. While under Na2SO4 electrolyte, large nanoparticles with two different morphologies, octahedral and cubic shapes, were deposited on the top of the nanotubes. All modified electrodes converted CO2 in methanol in different quantities, identified by gas chromatograph. However, the NT/TiO2 modified with CuO/Cu2O (80:20) nanoparticles using lactic acid as electrolyte showed better performance in the CO2 reduction to methanol (0.11 mmol L−1) in relation to the other electrodes. In all cases, a blend among the structures and nanoparticle morphologies were achieved and essential to create new site of reactions what improved the use of light irradiation, minimization of charge recombination rate and promoted high selectivity of products. Department of Chemical Engineering Institute of Environmental Science Chemistry and Pharmaceutical Federal University of São Paulo (UNIFESP), Rua São Nicolau, 210 Unesp National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry, P.O. Box 355 Institute of Chemistry São Paulo State University (UNESP), R. Francisco Degni 55 Unesp National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM) Institute of Chemistry, P.O. Box 355 Institute of Chemistry São Paulo State University (UNESP), R. Francisco Degni 55 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|