Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 41, Issue 44, Pages 19921-19928Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.09.015
Keywords
Photocatalytic H-2 production; Perovskite; Tantalate; Niobate
Categories
Funding
- Spanish Ministry of Economy and Competitiveness
- Arnarout-II PEOPLE-COFUND Marie Sklodowska-Curie Action from the European Union's FP7 (REA grant) [291803]
- [ENE2009-09432]
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The activity of ATa(0.5)Nb(0.5)O(3) (A: Li, Na or K) photocatalysts for H-2 production has been studied using methanol aqueous solutions. Previous studies showed that photocatalysts with 1:1 combination of Ta and Nb showed greatly improved activity compared to the single-metal oxides. In this work, compositional variations have shown that sodium suits best as alkali counterion for H-2 evolution. Variation of reaction parameters like pH and methanol concentration shows that neutral pH and 10 vol.% methanol lead to the best activity of NaNb0.5Ta0.5O3 perovskite. In addition, a notable increase in the H-2 evolution is observed by the use of Pt as co-catalyst, and the variation of its loading amount has also a great influence on the photocatalytic performance. The highest H-2 production rate is obtained with the NaNb0.5Ta0.5O3 catalyst with 0.125 wt.% of Pt loading under UV irradiation. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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