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Synthesis, luminescence, and photocatalytic activity of KLa2Ti3O9.5:Er3+ nanocrystals for water decomposition to hydrogen

Published online by Cambridge University Press:  19 October 2012

Ying Li ,
Yang Qu ,
Guofeng Wang ,
Kai Pan ,
Di Yu ,
Shuai Liu ,
Li Feng ,
Jingyu Cui  and
Liwei Ren
Ying Li
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Yang Qu
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Guofeng Wang*
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Kai Pan
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Di Yu
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Shuai Liu
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Li Feng
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Jingyu Cui
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
Liwei Ren
Affiliation:
School of Chemistry and Materials Science, Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Heilongjiang University, Harbin, Heilongjiang 150080, China
*
a)Address all correspondence to this author. e-mail: wanggf75@gmail.com
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Abstract

KLa2Ti3O9.5 and KLa2Ti3O9.5:Er3+ nanocrystals were successfully synthesized using a hydrothermal method and a subsequent calcination treatment. The band gap (Eg) of the KLa2Ti3O9.5 nanocrystals was calculated to be about 2.56 eV by means of the reflectance diffusion technique. Under 980-nm excitation, the KLa2Ti3O9.5:Er3+ nanocrystals emitted intense green (2H11/2/4S3/2 → 4I15/2) and red (4F9/2 → 4I15/2) upconversion (UC) luminescence. In comparison with pure KLa2Ti3O9.5, the KLa2Ti3O9.5:Er3+ nanocrystals exhibited a higher activity for water splitting into H2 under simulated solar light irradiation. We suggest that the enhancement of photocatalytic activity is related to the Brunauer-Emmett-Teller (BET) surface area and UC luminescence of KLa2Ti3O9.5:Er3+.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 22 , 22 November 2012 , pp. 2925 - 2929
Copyright
Copyright © Materials Research Society 2012

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