期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 11, 页码 5855-5863出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b10540
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资金
- Brazilian funding agency: CNPq [CNPq-486342/2013-1, CNPq-471220/2010-8]
- Brazilian funding agency: FAPERGS [FAPERGS-11/2000-4, 2235-2551/14-4]
- Brazilian funding agency: FUNDECT [23/200.247/2014]
The use of metal/oxide nanoparticles (NPs) as cocatalysts in heterogeneous photocatalysis is an important strategy to improve the photocatalytic activity of semiconductors for hydrogen generation. This article reports the use of a modified sputtering deposition method to prepare ultrafine NiO NPs cocatalysts dispersed on anodic Ta2O5 nanotubes (NTs). In situ X-ray absorption near-edge spectroscopy (XANES) measurements revealed that after exposing the as-prepared Ni NPs to air atmosphere a mixture of 68% of Ni and 32% of NiO was formed. Pure phase NiO NPs was successfully obtained after a controlled thermal oxidation at 500 degrees C which was confirmed by in situ XANES and ex situ XPS analyses. The photocatalytic hydrogen production activity was evaluated using ethanol as a sacrificial agent. Ta2O5 NTs with 0.16 wt % of NiO showed superior photocatalytic activity (up to 7.7 +/- 0.3 mmol h(-1) g(-1)) as compared to pure Ta2O5 NTs (4.9 +/- 0.3 mmol h(-1) g(-1).) The observed higher photocatalytic activity suggests that NiO/Ta2O5 NTs is a promising material for photocatalytic hydrogen evolution.
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