Synthesis of Ordered Mesoporous CuO-CeO2 Composite Frameworks as Anode Catalysts for Water OxidationReportar como inadecuado


Synthesis of Ordered Mesoporous CuO-CeO2 Composite Frameworks as Anode Catalysts for Water Oxidation


Synthesis of Ordered Mesoporous CuO-CeO2 Composite Frameworks as Anode Catalysts for Water Oxidation - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Department of Materials Science and Technology, University of Crete, Vassilika Vouton, Heraklion 71003, Greece





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Academic Editors: Jordi Sort and Eva Pellicer

Abstract Cerium-rich metal oxide materials have recently emerged as promising candidates for the photocatalytic oxygen evolution reaction OER. In this article, we report the synthesis of ordered mesoporous CuO-CeO2 composite frameworks with different contents of copperII oxide and demonstrate their activity for photocatalytic O2 production via UV-Vis light-driven oxidation of water. Mesoporous CuO-CeO2 materials have been successfully prepared by a nanocasting route, using mesoporous silica as a rigid template. X-ray diffraction, electron transmission microscopy and N2 porosimetry characterization of the as-prepared products reveal a mesoporous structure composed of parallel arranged nanorods, with a large surface area and a narrow pore size distribution. The molecular structure and optical properties of the composite materials were investigated with Raman and UV-Vis-NIR diffuse reflectance spectroscopy. Catalytic results indicated that incorporation of CuO clusters in the CeO2 lattice improved the photochemical properties. As a result, the CuO-CeO2 composite catalyst containing ~38 wt % CuO reaches a high O2 evolution rate of ~19.6 µmol·h−1 or 392 µmol·h−1·g−1 with an apparent quantum efficiency of 17.6% at λ = 365 ± 10 nm. This OER activity compares favorably with that obtained from the non-porous CuO-CeO2 counterpart ~1.3 µmol·h−1 and pure mesoporous CeO2 ~1 µmol·h−1. View Full-Text

Keywords: mesoporous materials; cerium oxide; nanocasting; nanostructured; water oxidation mesoporous materials; cerium oxide; nanocasting; nanostructured; water oxidation





Autor: Vassiliki Markoulaki Ι, Ioannis T. Papadas, Ioannis Kornarakis and Gerasimos S. Armatas *

Fuente: http://mdpi.com/



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