Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Superior performance of rGO-tin oxide nanocomposite for selective reduction of CO2 to methanol

Full text
Romeiro, F. C. [1] ; Silva, B. C. [1] ; Martins, A. S. [1] ; Zanoni, M. V. B. [1] ; Orlandi, M. O. [1]
Total Authors: 5
[1] Sao Paulo State Univ UNESP, Inst Chem, Araraquara 55 Prof Francisco Degni St, BR-14800060 Araraquara, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF CO2 UTILIZATION; v. 46, APR 2021.
Web of Science Citations: 3

This study reports on the photoelectrochemical reduction of CO2 to methanol using Sn3O4 and reduced graphene oxide-tin oxide (rGO-Sn) nanocomposite synthesized through the microwave-assisted hydrothermal method. The resulting rGO-Sn nanocomposite exhibited enhanced activity and good stability during photoelectrochemical CO2 reduction explained by Z-scheme electron transport. Graphene oxide (GO) has played a crucial role in the chemical composition and morphology of nanocomposites. The interaction between GO and Sn2+ ions during synthesis promoted the formation of the SnO2 phase in the nanocomposite, thus generating mixed rGO/Sn3O4/ SnO2 phases (the rGO-Sn nanocomposite). Remarkable selectivity for CO2/methanol conversion was obtained for both Sn3O4 and the nanocomposite at different potentials, in which the nanocomposite presented the highest conversion to methanol with a faradaic efficiency of 45 % at -0.3 V vs. Ag/AgCl. The improved activity of the nanocomposite was ascribed to the efficient use of solar energy (UV + visible light), to the decrease in electronic recombination in nanocomposite, which enabled an efficient electron-hole separation on the surface of the nanocomposite, and to the presence of rGO being combined with Sn3O4 and SnO2 structures, which ensured a faster charge transport rate. This study reveals the potential of rGO-Sn nanocomposites as photocathodic material for solar-to-chemical energy conversion. (AU)

FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
Grantee:Maria Valnice Boldrin
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/18856-5 - Photo(electro)chemical applications for the production of renewable fuels using nanocomposites based on tin oxide (SnO and Sn3O4) and carbon compounds (reduced graphene oxide and graphitic carbon nitride)
Grantee:Fernanda da Costa Romeiro
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/26219-0 - Study of Single Element Chemical Sensor Devices based on Semiconducting Metal Oxide Materials
Grantee:Marcelo Ornaghi Orlandi
Support Opportunities: Regular Research Grants
FAPESP's process: 17/13123-4 - Development of photoelectrocatalytic membranes based on TiO2 and Al2O3 modified and applied in the treatment of organic contaminants and microorganisms in aqueous solution
Grantee:Alysson Stefan Martins
Support Opportunities: Scholarships in Brazil - Post-Doctoral