Journal
APPLIED SURFACE SCIENCE
Volume 509, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145359
Keywords
Multifunctional carbon-metal oxide nanohybrids; Laser deposition; Photocatalysis; Energy storage
Categories
Funding
- Executive Unit for Financing Higher Education, Research, Development and Innovation of the Romanian Ministry of Education and Scientific Research [PN-III-P4-ID-PCE-2016-0550]
- Spanish Ministry of Economy, Industry and Competitiveness under AEI/FEDER,EU [ENE2017-89210-C2-1-R]
- Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Programme for Centres of Excellence in RD [SEV2015-0496]
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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 ZnO(x-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.
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