Catalysis Letters

, 133:97

The Role of Cu(I) Species for Photocatalytic Hydrogen Generation Over CuOx/TiO2

Article

DOI: 10.1007/s10562-009-0165-y

Cite this article as:
Wu, Y., Lu, G. & Li, S. Catal Lett (2009) 133: 97. doi:10.1007/s10562-009-0165-y

Abstract

The fabrication of different CuOx species (Cu(0), Cu(I) and Cu(II) species) over TiO2 has been accomplished and their roles in photoinduced hydrogen generation have been investigated. The results indicate that the positive charge in CuOx center affect photo-induced charge transfer significantly. Cu(I) species seems promote photocurrent generation while the Cu(II) species inhibits the photocurrent generation. Photoactivity order follows the similar sequence. Lower temperature calcination helps the formation of Cu(I) species and higher temperature treatment leads to the formation of Cu(II) species. At the lower loading level, the Cu content increase leads to the activity increase, but over loading of copper resulted in the decrease of activities for hydrogen generation. Detail analysis indicates that too much copper loading induces more Cu(II) center formation, as a results, the activity for hydrogen generation decreases. The species of Cu(0) does no affect the activity obviously at low loading level and shows detrimental effect at high loading level. The optimal loading amount of copper is 1.0Cu (wt%).

Keywords

Copper species Photocatalytic hydrogen production TiO2 

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouPeople’s Republic of China
  2. 2.Graduate University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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