Visible-light photocatalytic H2 evolution over a series of transition metal substituted Keggin-structure heteropoly blues

Zhenli Wang,Ying Lu,Yangguang Li,Shiming Wang,Enbo Wang

doi:10.1007/s11434-012-5050-1

Zhenli Wang, Ying Lu + Show 3 more

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https://doi.org/10.1007/s11434-012-5050-1

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Journal: Science Bulletin	Publication Date: Apr 28, 2012
Citations: 13	License type: CC BY 2.0

Affiliation: Northeast Normal University

Abstract

The visible light photocatalytic H2 evolution activities of a series of transition-metal substituted Keggin-structure heteropoly blues K6SiW11O39M(H2O)·nH2O (M = Co, Ni, Cu and Zn) were systematically studied with Pt nanoparticles as co-catalyst. The H2 evolution rates were 150, 98, 65 and 48 μmol h−1g−1 for SiW11Cu, SiW11Ni, SiW11Co and SiW11Zn, respectively, meaning that the order of photocatalytic activity of these heteropoly blues from transition-metal substituted polyoxometalates was: SiW11Cu > SiW11Ni > SiW11Co > SiW11Zn. The catalysts could be efficiently reused for at least 5 cycles.

Highlights

Photocatalytic H2 evolution on a large scale from renewable solar energy using low cost catalysts has attracted much attention as an important aspect of sustainable energy production [1]
In our search for POM photocatalysts with visible-light activity for photocatalytic H2 evolution, we studied visiblelight photocatalytic H2 evolution over a series of heteropoly blues (HPBs) of transition metal substituted POMs (TMSPs) based on the following considerations
The formation of HPBs has been confirmed by visible adsorption spectra (Figure S1), and the visible spectra of the reactant solutions exhibit obvious changes, which include a shift in the maximum adsorption and an increase of adsorption intensity (Figure S2)

Summary

Introduction

Photocatalytic H2 evolution on a large scale from renewable solar energy using low cost catalysts has attracted much attention as an important aspect of sustainable energy production [1]. The photocatalytic H2 evolution activity of some iso/heteropolyoxotungstates (such as [W10O32]4 and XW12O4n0 (X = Si, P, B, Ge, Fe, Co or H2)) have been studied with Pt nanoparticles as co-catalyst and methanol as sacrificial agent [16–21]. There is high demand for POM photocatalysts with visible-light activity for more efficient use of solar energy. In our search for POM photocatalysts with visible-light activity for photocatalytic H2 evolution, we studied visiblelight photocatalytic H2 evolution over a series of heteropoly blues (HPBs) of transition metal substituted POMs (TMSPs) based on the following considerations. The electronic structure of TMSPs can be adjusted through changing the transition metal ions participating in the substitution [22].

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