One step microwave-hydrothermal synthesis of rGO–TiO2 nanocomposites for enhanced electrochemical oxygen evolution reaction

Autor:	Edson Nossol, Samuel C. Silva, Fernanda C. Romeiro, Renata C. Lima
Rok vydání:	2020
Předmět:	Nanocomposite Graphene Band gap Chemistry Oxygen evolution Oxide General Chemistry Catalysis Hydrothermal circulation law.invention symbols.namesake chemistry.chemical_compound Chemical engineering law Materials Chemistry symbols Hydrothermal synthesis Raman spectroscopy
Zdroj:	New Journal of Chemistry. 44:6825-6832
ISSN:	1369-9261 1144-0546
DOI:	10.1039/d0nj01475c
Popis:	The present work reports the one-step synthesis of reduced graphene oxide (rGO)–TiO2 nanocomposites using a microwave-assisted hydrothermal method. The well-dispersed TiO2 nanoparticles on rGO sheets were obtained without a reducing agent. X-ray diffraction, Raman and infrared spectroscopies indicated the reduction of graphene oxide (GO) under microwave conditions, and the microscopy images revealed the successful formation of nanocomposites. In addition, double band gap values (Egap = 2.39 and 3.37 eV) for the 16rGO–TiO2 nanocomposite were observed. The heterostructure presented a higher electrocatalytic performance for water oxidation under neutral and alkaline conditions, when compared to pure TiO2 nanoparticles, and long-term current stability. The electrochemical characterization showed that the rGO–TiO2 nanocomposites presented efficient charge separation, as demonstrated by photoluminescence spectra, which was related to the high electronic transfer between TiO2 nanoparticles and rGO sheets. This work provided new insights into the development of high performance and cost-effective rGO–TiO2 electrocatalysts for the oxygen evolution reaction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::aee53fb9c7fb355f607ca75e5676535b https://doi.org/10.1039/d0nj01475c Zobrazit plný text záznamu