Journal
APPLIED SURFACE SCIENCE
Volume 423, Issue -, Pages 743-751Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.06.221
Keywords
Zinc oxide; Graphene; Nanoparticles; Microwave; Electrocatalysis O-2 evolution
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (Capes)
- Financiadora de Estudos e Projetos (FINEP)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [APQ-00988-13]
- Rede Mineira de Quimica (RQ-MG) (FAPEMIG Project) [CEX-RED-00010-14]
- Grupo de Materiais Inorganicos do Triangulo - GMIT research group - FAPEMIG [APQ-00330-14]
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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.
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