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Photocatalytic activity of hydrothermally synthesized tantalate pyrochlores for overall water splitting

Paper ID Volume ID Publish Year Pages File Format Full-Text
44056 46001 2006 5 PDF Available
Title
Photocatalytic activity of hydrothermally synthesized tantalate pyrochlores for overall water splitting
Abstract

Tantalate and niobate pyrochlores, Ca2M2O7 (M = Nb, Ta) and A2Ta2O6 (A = Na, K), were prepared by a hydrothermal method. These oxides were crystallized directly from tantalum or niobium alkoxide in the presence of sodium, potassium or calcium cation in basic solutions at temperatures between 373 and 448 K, and their crystallinity was improved by calcination in air. Stoichiometric liberations of H2 and O2 were achieved over tantalate pyrochlores loaded with a small amount of nickel oxide (NiO) as a catalyst for H2 production, while the NiO-loaded niobate pyrochlore showed no photocatalytic activity. The photocatalytic functions of the tantalate pyrochlores were attributed to their energy levels of the bottom of conduction bands being much more negative than those of the niobate pyrochlores.

Keywords
Overall water splitting; Photocatalysis; Tantalate pyrochlores; Hydrothermal synthesis; Crystallinity; Band gap energy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 300, Issue 2, 26 January 2006, Pages 186–190
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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