Data/hora: 24/06/2024 23:06:20

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 02/10/2023
Data da última atualização: | 02/10/2023
Autoria: | SILVA, R. M. e; SOUZA, F. L.; DIAS, E.; SILVA, G. T. S. T. da; DÚRAN, F. E.; REGO, A.; HIGGINS, D.; RIBEIRO, C.
Afiliação: | Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada; Department of Chemistry and Molecular Physics, Institute of Chemistry of Sao Carlos, University of Sao Paulo, Brazil; Department of Chemistry and Molecular Physics, Institute of Chemistry of Sao Carlos, University of Sao Paulo, Brazil; Interdisciplinary Laboratory of Electrochemistry and Ceramics, Department of Chemistry, Federal University of Sao Carlos; Department of Fuel and Hydrogen Cells, Nuclear and Energy Research Institute; Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada; Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada; CAUE RIBEIRO DE OLIVEIRA, CNPDIA.
Título: | The role of TiO2:SnO2 heterojunction for partial oxidation of methane by photoelectrocatalytic process at room temperature.
Ano de publicação: | 2023
Fonte/Imprenta: | Journal of Alloys and Compounds, v. 968, 172090, 2023.
Páginas: | 7 p.
ISSN: | 0925-8388
DOI: | https://doi.org/10.1016/j.jallcom.2023.172090
Idioma: | Inglês
Conteúdo: | hane into hydrocarbons using photoelectrochemical routes is attractive from a sustainability point of view owing to the possibility of using renewable energy (i.e., solar illumination) to activate this stable molecule. However, the process demands the development of novel catalysts that can promote methane activation and oxidation in a controlled manner to increase energy conversion efficiency. Herein, we demonstrated that semiconductor heterostructures improved charge separation compared to the individual materials alone. A more effortless transfer between bands favors the separation of the electron-hole (e&#8722; /h+) pairs generated by the photoelectrocatalytic system and prevents them from recombining. This process produces reactive oxygens, essential to driving methane oxidation conversion of the C?H bond cleavage. TiO2:SnO2 semiconductor heterojunction catalysts in film shape were investigated for methane oxidation via a photoelectrocatalytic process. The methane oxidation reactions were carried out in an inflow and sealed electrochemical system for 1 h. Liquid-state nuclear magnetic resonance revealed methanol and acetic acid as the main liquid products, where the TiO2:SnO2 heterojunction exhibited better performance with values of 30 and 8 µmol. cm&#8722; 2 .h&#8722; 1 , respectively. Compared to their materials alone, the superior performance of the TiO2:SnO2 heterojunction is attributed to the formation of heterostructure type II that enables a more effortless transfer between bands, facilitating the separation of the generated e&#8722; /h+ pairs under UV-Vis irradiation. The outcomes achieved here will motivate further studies for developing semiconductor heterojunction structure catalysts in photoelectrocatalysis to partially oxidize methane into valuable chemicals.
Palavras-Chave: | CH4 oxidation; Methane oxidation; Photoelectrocatalysis; TiO2 SnO2 heterojunction.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (18287-1) - UPC - AP - DD - PROCI.23/94 -  - 2023/99 - DIS