rGO-ZnO nanocomposites for high electrocatalytic effect on water oxidation obtained by microwave-hydrothermal method
| Autor: | Fernanda C. Romeiro, Mônica A. Rodrigues, Luiz A. J. Silva, Renata C. Lima, Luís F. da Silva, Elson Longo, Edson Nossol, Ariadne C. Catto |
|---|---|
| Přispěvatelé: | Universidade Federal de Uberlândia (UFU), Universidade Estadual Paulista (Unesp), Universidade Federal de São Carlos (UFSCar) |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Passivation Inorganic chemistry Oxide General Physics and Astronomy 02 engineering and technology Overpotential 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound law Zinc oxide Electrolysis Nanocomposite Electrolysis of water Graphene Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Chemical state chemistry Nanoparticles Electrocatalysis O-2 evolution 0210 nano-technology Microwave |
| Zdroj: | Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.06.221 |
| Popis: | Made available in DSpace on 2018-11-26T15:44:57Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-11-30 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Financiadora de Estudos e Projetos (FINEP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) Reduced graphene oxide-zinc oxide (rGO-ZnO) nanocomposites were successfully synthesized using a facile microwave-hydrothermal method under mild conditions, and their electrocatalytic properties towards O-2 evolution were investigated. The microwave radiation played an important role in obtainment of well dispersed ZnO nanoparticles directly on reduced graphene oxide sheets without any additional reducing reagents or passivation agent. X-ray diffraction (XRD), Raman and infrared spectroscopies indicated the reduction of GO as well as the successful synthesis of rGO-ZnO nanocomposites. The chemical states of the samples were shown by XPS analyses. Due to the synergic effect, the resulting nanocomposites exhibited high electronic interaction between ZnO and rGO sheets, which improved the electrocatalytic oxidation of water with low onset potential of 0.48 V (vs. Ag/AgCl) in neutral pH and long-term stability, with high current density during electrolysis. The overpotential for water oxidation decreased in alkaline pH, suggesting useful insight on the catalytic mechanism for O-2 evolution. (C) 2017 Elsevier B.V. All rights reserved. Univ Fed Uberlandia, Inst Quim, BR-38400902 Uberlandia, MG, Brazil Univ Estadual Paulista, LIEC, Inst Quim, BR-14800900 Araraquara, SP, Brazil Univ Fed Sao Carlos, Dept Fis, BR-13565905 Sao Carlos, SP, Brazil Univ Fed Sao Carlos, Dept Quim, LIEC, BR-13565905 Sao Carlos, SP, Brazil Univ Estadual Paulista, LIEC, Inst Quim, BR-14800900 Araraquara, SP, Brazil FAPEMIG: APQ-00988-13 FAPEMIG: CEX-RED-00010-14 FAPEMIG: APQ-00330-14 |
| Databáze: | OpenAIRE |
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