Journal
APPLIED SURFACE SCIENCE
Volume 286, Issue -, Pages 61-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2013.09.014
Keywords
Photocatalysis; Hydrogen production; Hydrothermal synthesis; Post calcination; Zn2GeO4
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Funding
- Natural Science Foundation of Ningxia [NZ1110]
- National Natural Science Foundation of China (NSFC) [21263018]
- 211 Project in Ningxia University
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The rod-like Zn2GeO4 nanopowder was synthesized by a hydrothermal method and investigated for photocatalytic hydrogen generation from methanol aqueous solution. It is found that the post-calcination of Zn2GeO4 efficiently improves the photocatalytic activity while the morphology of Zn2GeO4 keeps almost unchangeable. The optimum photocatalyst Exhibits 430 timol/h/g hydrogen evolution, which is more than 2 times higher than that of Zn2GeO4 without any calcination. XRD show the improvement of crystallinity of Zn2GeO4. UV-vis and photoluminescence spectra demonstrate the reduction of impurity in Zn2GeO4. It is supposed that the higher crystallinity and the reduction of impurity of Zn2GeO4 nanorod are mainly responsible to the improved activity. It is put forward that hydrothermal synthesis and then post-calcination is an efficient method to prepare highly active photocatalyst with high crystallinity and large surface areas. (C) 2013 Elsevier B.V. All rights reserved.
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