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

CuO Decoration Controls Nb2O5 Photocatalyst Selectivity in CO2 Reduction

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Nogueira, Andre E. [1] ; Silva, Gelson T. S. T. [2, 3] ; Oliveira, Jessica A. [4, 3] ; Lopes, Osmando F. [5, 6] ; Torres, Juliana A. [3] ; Carmo, Marcelo [6] ; Ribeiro, Caue [3, 6]
Total Authors: 7
[1] Fed Univ Ouro Preto UFOP, Dept Chem, Inst Exact & Biol Sci ICEB, BR-35400000 Ouro Preto, MG - Brazil
[2] Univ Fed Sao Carlos, Dept Chem, BR-13565905 Sao Carlos, SP - Brazil
[3] Embrapa Instrumentat, BR-13560970 Sao Carlos, SP - Brazil
[4] Univ Fed Sao Carlos, Dept Chem Engn, BR-13565905 Sao Carlos, SP - Brazil
[5] Univ Fed Uberlandia, Inst Chem, Lab Photochem & Mat Sci, BR-38400902 Uberlandia, MG - Brazil
[6] Forschungszentrum Julich, Inst Energy & Climate Res IEK Electrochem Proc 14, D-52425 Mich - Germany
Total Affiliations: 6
Document type: Journal article
Source: ACS APPLIED ENERGY MATERIALS; v. 3, n. 8, p. 7629-7636, AUG 24 2020.
Web of Science Citations: 0

The reformation of CO2 through photocatalytic processes to obtain products with high energy value and compatibility with the current energy infrastructure is a compelling strategy to minimize the emission of CO2 into the atmosphere, one of the main greenhouse gases. However, practical application of such a photocatalytic system requires significant efforts for improved CO2 photoreduction performance and product selectivity. Thus, in the present work, CuO nanoparticles were combined with Nb2O5 in order to improve the photocatalytic properties of these semiconductors in the CO2 photoreduction process. Nb2O5/CuO heterojunctions were prepared via a solvothermal treatment method, while the experimental tools, such as FESEM, HRTEM, and DRS, were employed to evaluate the microstructural and electronic properties. We describe how CuO decoration over Nb2O5 adjusts its selectivity for CO2 reduction to CH4, HCOOH, or H3CCOOH in different contents. An investigation of CO2 photoreduction using different electron donors/scavengers (water, sodium oxalate, and potassium bromate) under ultraviolet radiation revealed that its decoration influences local CO production by modifying the selectivity. CO has been confirmed as the main intermediate for HCOOH and CH3COOH production, and CO2 reduction efficiency increases at low CuO content (2.5% wt), leading to the formation of soluble hydrocarbons, and increases for CH4 in higher amounts (10% wt). (AU)

FAPESP's process: 16/21515-7 - Development of magnesium oxide with zinc and titanium heterostructure for application in artificial photosynthesis processes
Grantee:Juliana Arriel Torres
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products
Grantee:José Maria Correa Bueno
Support type: Research Projects - Thematic Grants
Grantee:André Esteves Nogueira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 16/09746-3 - Electro-/Photoelectrocatalysis Reduction of CO2: Efficiency, Selectivity and Oscillatory Kinetics
Grantee:Osmando Ferreira Lopes
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 15/14330-8 - Studies in the synthesis and application of semiconducting nanocrystal heterostructures in artificial photosynthetic processes
Grantee:Cauê Ribeiro de Oliveira
Support type: Research Program on Global Climate Change - Regular Grants