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      Fabrication of a Au-loaded CaFe 2O 4/CoAl LDH p–n junction based architecture with stoichiometric H 2 & O 2 generation and Cr(vi) reduction under visible light

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          Abstract

          Visible-light-efficient Au-loaded CaFe 2O 4/CoAl LDH p–n junction for H 2 & O 2 generation and Cr( vi) reduction.

          Abstract

          The search for visible-light-active, highly efficient and durable bi-functional photocatalysts is now essential for the development of various renewable energy sources and conversion technologies. Herein, we report a novel magnetically separable Au-loaded CaFe 2O 4/CoAl LDH heterostructure with strong coulombic interfacial interactions fabricated through a simple two-step process. XRD, XPS and TEM analysis of the synthesized samples were carried out for the structural and morphological characterization. The TEM study confirmed the existence of a firm attachment between the Au nanoparticles with the CaFe 2O 4/CoAl LDH heterostructures, which provides a unique support due to an exterior confinement effect. Formation of the heterojunction with a different electronic behaviour was also confirmed from an inverted V-shaped M–S plot, suggesting the presence of a large intimate contact interface between CoAl LDH and CaFe 2O 4 to favour the efficient separation and transfer of photoinduced charge pairs. The CoAl LDH–CaFe 2O 4@Au ternary heterostructure showed a high hydrogen generation rate of 379.1 μmol h −1, oxygen evolution rate of 205.5 μmol h −1 and Cr( vi) reduction rate of 99% under visible light irradiation. The CoAl LDH–CaFe 2O 4@Au heterostructure demonstrated its long-term stability and durability during photocatalytic investigations. The efficient photocatalytic activity of the catalysts was due to the synergistic effect of hot electron transfer by Au nanoparticles and easy mass transport through the interface owing to formation of a p–n junction by increasing the contact area. The mechanism of the photocatalytic activity was also supported by PL, EIS and photocurrent measurements. This work provides a novel strategy to design junction-based nanostructures as a promising photocatalyst for solar energy conversion.

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            Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results

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              Inorganic nanostructures for photoelectrochemical and photocatalytic water splitting.

              The increasing human need for clean and renewable energy has stimulated research in artificial photosynthesis, and in particular water photoelectrolysis as a pathway to hydrogen fuel. Nanostructured devices are widely regarded as an opportunity to improve efficiency and lower costs, but as a detailed analysis shows, they also have considerably disadvantages. This article reviews the current state of research on nanoscale-enhanced photoelectrodes and photocatalysts for the water splitting reaction. The focus is on transition metal oxides with special emphasis of Fe(2)O(3), but nitrides and chalcogenides, and main group element compounds, including carbon nitride and silicon, are also covered. The effects of nanostructuring on carrier generation and collection, multiple exciton generation, and quantum confinement are also discussed, as well as implications of particle size on surface recombination, on the size of space charge layers and on the possibility of controlling nanostructure energetics via potential determining ions. After a summary of electrocatalytic and plasmonic nanostructures, the review concludes with an outlook on the challenges in solar fuel generation with nanoscale inorganic materials.
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                Author and article information

                Contributors
                Journal
                ICFNAW
                Inorganic Chemistry Frontiers
                Inorg. Chem. Front.
                Royal Society of Chemistry (RSC)
                2052-1553
                January 15 2019
                2019
                : 6
                : 1
                : 94-109
                Affiliations
                [1 ]Center for Nano Science and Nano Technology SOA Deemed to be University
                [2 ]Bhubaneswar-751030
                [3 ]India
                Article
                10.1039/C8QI00952J
                aa9e6c32-09eb-4a00-af70-3e810066f847
                © 2019

                http://rsc.li/journals-terms-of-use

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