Highly efficient photocatalysts constructed by rational assembly of dual-cocatalysts separately on different facets of BiVO4
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- 20 January 2014
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 7 (4), 1369-1376
- https://doi.org/10.1039/c3ee43304h
Abstract
Cocatalysts play important roles in promoting the catalytic reactions of semiconductor photocatalysts. Especially, deposition of dual cocatalysts, i.e., oxidation and reduction cocatalysts, onto a semiconductor photocatalyst can significantly improve its photocatalytic activity due to the synergetic effect of rapid consumption of photogenerated electrons and holes. However, in most cases, the cocatalysts are randomly deposited onto the semiconductor photocatalysts, where the cocatalysts cannot function fully. Herein, based on the findings that photogenerated electrons and holes can be spatially separated onto the different facets of BiVO4, we have successfully prepared two types of photocatalysts (M/MnOx/BiVO4 and M/Co3O4/BiVO4, where M stands for noble metals) with reduction and oxidation cocatalysts selectively deposited onto the {010} and {110} facets of BiVO4 by a photo-deposition method. Remarkably enhanced photocatalytic activities were observed for such assembled photocatalysts in control experiments of photocatalytic water oxidation and photocatalytic degradation of methyl orange and rhodamine B. In-depth investigations show that the enhanced photocatalytic performances are due to not only the intrinsic nature of charge separation between the {010} and {110} facets of BiVO4, but also the synergetic effect of dual-cocatalysts deposited onto the different facets of BiVO4. This work further proves the feasibility of the general concepts for approaching efficient artificial photosynthesis systems, namely, engineering of crystal-based photocatalysts by selective deposition of suitable reduction and oxidation cocatalysts onto the different facets of light absorbing semiconductor crystals.Keywords
This publication has 28 references indexed in Scilit:
- Roles of Cocatalysts in Photocatalysis and PhotoelectrocatalysisAccounts of Chemical Research, 2013
- Visible-light-driven nonsacrificial water oxidation over tungsten trioxide powder modified with two different cocatalystsEnergy & Environmental Science, 2012
- Wireless Solar Water Splitting Using Silicon-Based Semiconductors and Earth-Abundant CatalystsScience, 2011
- On the True Photoreactivity Order of {001}, {010}, and {101} Facets of Anatase TiO2 CrystalsAngewandte Chemie, 2011
- Semiconductor-based Photocatalytic Hydrogen GenerationChemical Reviews, 2010
- Photocatalytic Water Splitting: Recent Progress and Future ChallengesThe Journal of Physical Chemistry Letters, 2010
- Heterogeneous photocatalyst materials for water splittingChemical Society Reviews, 2008
- A review and recent developments in photocatalytic water-splitting using TiO2 for hydrogen productionRenewable and Sustainable Energy Reviews, 2007
- Photocatalyst releasing hydrogen from waterNature, 2006
- Electrochemical Photolysis of Water at a Semiconductor ElectrodeNature, 1972