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K4Ce2M10O30 (M = Ta, Nb) as visible light-driven photocatalysts for hydrogen evolution from water decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
43787 45988 2006 9 PDF Available
Title
K4Ce2M10O30 (M = Ta, Nb) as visible light-driven photocatalysts for hydrogen evolution from water decomposition
Abstract

A series of single-phase metal oxide photocatalysts K4Ce2M10O30 (M = Ta, Nb), capable of evolving H2 and O2 from aqueous solutions containing a sacrificial electron donor (Na2SO3) and acceptor (AgNO3), respectively, under visible light irradiation (λ > 420 nm) without any co-catalyst were presented. The activities were greatly enhanced by the incorporation of Pt, RuO2 and NiO (NiOx) as co-catalysts on the prepared oxides. The photocatalysts have an appropriate band gap energy ca. 1.8–2.3 eV (corresponding to absorption edge of 540–690 nm) and excellent chemical potential level for utilization of solar energy, representing candidates of photocatalysts for hydrogen evolution from water decomposition. Density function theory (DFT) calculation indicated that while their valence bands are composed of hybridization with O 2p + Ta 5d (or Nb 4d) and occupied Ce 4f orbitals, the conduction bands of these photocatalysts K4Ce2M10O30 (M = Ta, Nb) are mainly attributable to the Ta 5d (or Nb 4d) orbitals. Although the unoccupied Ce 4f orbitals have overlap in the bottom of conduction band, they are less effective in transferring electrons and photocatalytic activities for their high localized nature. The contribution of these orbitals to the energy bands affects the electronic structure of the both photocatalysts and gives rise to their differences in light absorption and photocatalytic activities.

Keywords
Photocatalyst; Visible light-driven; K4Ce2M10O30 (M = Ta, Nb); Water decomposition; DFT calculation
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K4Ce2M10O30 (M = Ta, Nb) as visible light-driven photocatalysts for hydrogen evolution from water decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 309, Issue 1, 17 July 2006, Pages 76–84
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us