Carbon-based nanomaterials and ZnO ternary compound layers grown by laser technique for environmental and energy storage applications
| Autor: | Eniko Gyorgy, C. Popescu, Constantin Logofatu, A. Pérez del Pino, Raluca Ivan |
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| Přispěvatelé: | Ministry of Education and Scientific Research (Romania), Ministerio de Economía, Industria y Competitividad (España), Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Energy storage Double-layer capacitance Oxide Laser deposition General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Carbon nanotube 010402 general chemistry 01 natural sciences Pseudocapacitance law.invention Nanomaterials chemistry.chemical_compound law Photocatalysis Graphene Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry Chemical engineering Ternary compound Multifunctional carbon-metal oxide nanohybrids 0210 nano-technology Carbon |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2016-0550 |
| Popis: | Carbon nanotube – highly reduced graphene oxide – transition metal oxide (ZnO) nanohybrid layers were synthesized using a one-step laser technique. Commercial multiwall carbon nanotubes (MWCNTs), graphene oxide (GO) platelets and ZnO nanoparticles were used as starting materials. We discuss the influence of carbon/metal oxide ratio on the physico-chemical properties of the nanohybrid layers, geometrical characteristics, shape and dimensions of constituent nanoentities, chemical composition and chemical bonding states, optical properties, UV–visible absorption, band gap values, as well as charge transfer properties. In the followings the relation between these properties and functional characteristics, removal of water contaminants, antibiotic molecules, and charge storage performances of the ternary, MWCNTs/reduced GO/ZnO layers are presented, identifying the optimum relative concentrations of the constituting nanomaterials. The high photocatalytic efficiencies both under UV and visible light irradiations, even after several consecutive degradation cycles, were attributed to effective separation of photogenerated charge carriers by carbon nanomaterials as well as formation of oxygen deficient ZnOx−1 nanocrystals. The enhanced charge storage capacity of ternary nanohybrid electrodes is based on combined electrochemical double layer capacitance and pseudocapacitance implying redox reactions on the surface and subsurface of the layers in contact with the electrolyte. Both functional properties are strongly influenced by the relative concentrations of the nanomaterials constituting the ternary layers. The authors thank the financial support of the Executive Unit for Financing Higher Education, Research, Development and Innovation of the Romanian Ministry of Education and Scientific Research under the contract PN-III-P4-ID-PCE-2016-0550, the Spanish Ministry of Economy, Industry and Competitiveness under the projects ENE2017-89210-C2-1-R, AEI/FEDER,EU. ICMAB acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the “Severo Ochoa” Programme for Centres of Excellence in R&D (SEV-2015-0496). |
| Databáze: | OpenAIRE |
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