期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 261, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118221
关键词
Cu2O; CO2 reduction; Polydopamine; Photoelectrocatalysis; Methanol
资金
- Conselho Naconal de Desenvolvimento Cientiflco e Tecnologico (CNPq)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [150493/2017-7, 2019/00463-7, 2016/18057-7, 2017/12790-7]
- National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies, INCT-DATREN (FAPESP) [2014/50945-4]
- National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies, INCT-DATREN (CNPq) [465571/2014-0]
- FAPESP (Brazil's National Oil, Natural Gas and Biofuels Agency) [2017/11631-2]
This paper investigates the influence of morphology of Cu2O nanoparticles (cubes, NcCu(2)O; spheres, NsCu(2)O; 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-NsCu(2)O, TiO2NT@PDA-NoCu2O, and TiO2NT@PDA-NcCu(2)O electrodes, with faradaic efficiencies of 27, 39, and 66%, respectively. The conversion to methanol was 357% higher with NcCu(2)O, 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 NcCu(2)O 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).
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