Author(s):
Torquato, Lilian D. Moura [UNESP] ; Pastrian, Fabián A.C. ; Perini, João A. Lima [UNESP] ; Irikura, Kallyni [UNESP] ; de L. Batista, Ana Paula ; de Oliveira-Filho, Antonio G.S. ; Córdoba de Torresi, Susana I. ; Zanoni, Maria V. Boldrin [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/201223
Origin: Oasisbr
Subject(s): CO2 reduction; Cu2O; Methanol; Photoelectrocatalysis; Polydopamine; CO2 reduction; CO2 reduction; Cu2O; Cu2O; Methanol; Methanol; Photoelectrocatalysis; Photoelectrocatalysis; Polydopamine; Polydopamine
Description
Made available in DSpace on 2020-12-12T02:27:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-02-01
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
This paper investigates the influence of morphology of Cu2O nanoparticles (cubes, NcCu2O; spheres, NsCu2O; octahedrons, NoCu2O), deposited on TiO2 nanotubes (TiO2NT) coated with PDA, in the photoelectrocatalytic conversion of CO2 to methanol. At low bias (+0.2 V) a production of 10.0, 6.0 and 5.4 mg L−1 of methanol was obtained for TiO2NT@PDA-NsCu2O, TiO2NT@PDA-NoCu2O, and TiO2NT@PDA-NcCu2O electrodes, with faradaic efficiencies of 27, 39, and 66%, respectively. The conversion to methanol was 357% higher with NcCu2O, compared to the TiO2NT@PDA electrode. The results indicated that both the optical properties and the photocatalytic performance of nanostructures were facet-dependent. The superior catalytic activity of NcCu2O was attributed to the higher concentration of oxygen vacancies on {100} facets, which promotes the activation of CO2 with an energy of −1.2 kcal mol−1. With a lower concentration of oxygen vacancies, CO2 molecule is only physisorbed on {111} facets with an energy of −8.8 kcal mol−1.
São Paulo State University (UNESP) Institute of Chemistry, Araraquara. 55 Prof. Francisco Degni St
National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactivies (INCT-DATREM) São Paulo State University (UNESP) Institute of Chemistry
University of São Paulo (USP) Institute of Chemistry, 748 Prof. Lineu Prestes Ave
University of São Paulo (USP) Faculty of Philosophy Sciences and Letters, 3900 Bandeirantes Ave
São Paulo State University (UNESP) Institute of Chemistry, Araraquara. 55 Prof. Francisco Degni St
National Institute for Alternative Technologies of Detection Toxicological Evaluation and Removal of Micropollutants and Radioactivies (INCT-DATREM) São Paulo State University (UNESP) Institute of Chemistry
FAPESP: #150493/2017-7
FAPESP: #2016/18057-7
FAPESP: #2017/11631-2
FAPESP: #2017/12790-7
FAPESP: #2019/00463-7
