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|Title:||Boosting photochemical activity by Ni doping of mesoporous CoO nanoparticle assemblies||Authors:||Velegraki, Georgia
Papadas, Ioannis T.
Manos, Manolis J.
Choulis, Stelios A.
Armatas, Gerasimos S.
|Keywords:||Chemical compositions;Environmental remediation;UV-vis optical absorption;Photochemical activity;High surface area mesoporous||Category:||Chemical Sciences||Field:||Natural Sciences||Issue Date:||1-Mar-2019||Source:||Inorganic Chemistry Frontiers, 2019, Volume 6, Issue 3, Pages 765-774||Journal:||Inorganic Chemistry Frontiers||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 (Co 1-x Ni x O) 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 Co 1-x Ni x O 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.||URI:||http://ktisis.cut.ac.cy/handle/10488/13630||ISSN:||2052-1553||DOI:||10.1039/c8qi01324a||Rights:||© 2019 the Partner Organisations.||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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