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Boosting photochemical activity by Ni doping of mesoporous CoO nanoparticle assemblies

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Abstract

The rational design of semiconductor nanostructures is of utmost importance for efficient solar energy conversion and environmental remediation. In this article, we report high-surface-area mesoporous networks consisting of Ni-implanted cubic CoO (Co1−xNixO) nanoparticles as promising catalysts for the detoxification of aqueous Cr(VI) solutions. Mechanistic studies with X-ray photoelectron, UV–vis optical absorption, fluorescence and electrochemical impedance spectroscopy and theoretical (DFT) calculations indicate that the performance enhancement of these catalysts arises from the high charge transfer kinetics and oxidation efficiency of surface-reaching holes. By tuning the chemical composition, the Co1−xNixO mesoporous catalyst at 2 atomic% Ni content imparts outstanding photocatalytic Cr(VI) reduction and water oxidation activity, corresponding to an apparent quantum yield (QY) of 1.5% at λ = 375 nm irradiation light.

Graphical abstract: Boosting photochemical activity by Ni doping of mesoporous CoO nanoparticle assemblies

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Publication details

The article was received on 09 Dec 2018, accepted on 03 Feb 2019 and first published on 04 Feb 2019


Article type: Research Article
DOI: 10.1039/C8QI01324A
Citation: Inorg. Chem. Front., 2019, Advance Article

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    Boosting photochemical activity by Ni doping of mesoporous CoO nanoparticle assemblies

    G. Velegraki, I. Vamvasakis, I. T. Papadas, S. Tsatsos, A. Pournara, M. J. Manos, S. A. Choulis, S. Kennou, G. Kopidakis and G. S. Armatas, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C8QI01324A

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