| Full text | |
| Author(s): |
de Brito, Juliana Ferreira
[1]
;
Araujo, Angela Regina
[1]
;
Rajeshwar, Krishnan
[2]
;
Boldrin Zanoni, Maria Valnice
[1]
Total Authors: 4
|
| Affiliation: | [1] UNESP, Inst Chem Araraquara, BR-14800900 Araraquara, SP - Brazil
[2] Univ Texas Arlington, Dept Chem & Biochem, Arlington, TX 76019 - USA
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | CHEMICAL ENGINEERING JOURNAL; v. 264, p. 302-309, MAR 15 2015. |
| Web of Science Citations: | 37 |
| Abstract | |
This work focuses on photoelectrochemical CO2 reduction at a Cu/Cu2O electrode (1 x 1 cm(2)). The formation of methanol, ethanol, formaldehyde, acetaldehyde, and acetone was monitored during UV-visible radiation for 3 h at +0.20 V (vs. Ag/AgCl reference); 80% of the initial CO2 was removed. In this process, the photogenerated electrons in the p-type Cu2O semiconductor reduced CO2 (CO2 + e(-) --> CO2-center dot). Subsequent reaction involved radical species that originated during photolysis and dictated the product distribution observed. Methanol formation prevailed for a short period (<30 min); acetaldehyde and acetone were the main products after a longer accumulation period (>120 min). A reaction scheme is presented to account for the product evolution and reactions with the H-center dot, CH3 center dot, and OH center dot radical species generated in situ. The medium pH was identified as a key variable in the selectivity of the methanol formation. (C) 2014 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 12/02725-0 - Study of the photoelectrocatalytic reduction of CO2 using TiO2, TiO2/Pt electrode nanotubes, and Cu/CuO electrodes |
| Grantee: | Juliana Ferreira de Brito |
| Support Opportunities: | Scholarships in Brazil - Master |
| FAPESP's process: | 08/10449-7 - Assessment of occurrence, toxicity/genotoxicity and degradation processes of dyes in effluents and surface water |
| Grantee: | Maria Valnice Boldrin |
| Support Opportunities: | Research Projects - Thematic Grants |