期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 39, 期 17, 页码 8959-8968出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.03.258
关键词
Ni-NiO core/shell structure; Enhanced surface electron transfer; Fermi level; Photocatalytic hydrogen evolution; Visible light irradiation
资金
- National Natural Science Foundation of China, China [21173242]
- 973 Program and 863 Program of Ministry of Sciences and Technology of China, China [2013CB632404, 2012AA051501, 2009AA05Z117]
A Ni@NiO core/shell cluster was fabricated on TiO2 surface (Ni@NiO/TiO2) and its roles on surface electron transfer and the enhancement on hydrogen evolution under visible light irradiation were investigated. For a comparison, the Ni/TiO2 and NiO/TiO2 catalysts were fabricated, respectively. By photosensitization using Eosin Y as an antenna molecule, (1.6 wt%)Ni@NiO/TiO2 exhibited the highest activity (364.1 mu mol h(-1)) in comparison with (1.6 wt%)Ni/TiO2 and (1.6 wt%)NiO/TiO2 and the corresponding apparent quantum efficiency reached 28.6% at 460 nm. The photoluminescence spectra and photoelectrochemical characterization results confirmed that the Ni@NiO core/shell structure could promote the photogenerated electrons transferring from TiO2 conduction band to Ni@NiO clusters, resulting in the quicker separation of electron hole pairs. In addition, part of NiO shell can be reduced into metallic Ni during the photoreaction and vice versa. Cyclic voltammogram characterization verified that the transformation between Ni and NiO was a dynamic balance process, which can not only provide reacting channels for electrons and protons but also ensure the photocatalytic hydrogen evolution proceeding continuously. This study discloses structure-dependent effect of non-noble metal cocatalyst on semiconductor photocatalysts in photocatalytic water reduction, and gives an insight into designing highefficient non-noble metal/semiconductor hybrid photocatalysts. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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