Enhancement of plasmonic activity by Pt/Ag bimetallic nanocatalyst supported on mesoporous silica in the hydrogen production from hydrogen storage material

[Display omitted] •A visible-light responsive PtAg bimetallic plasmonic catalyst was designed.•Catalysts were examined in hydrogen production from ammonia borane.•Significant activity enhancement was observed for Pt(0.25)/Ag/SBA-15 under visible light.•Effect of light, temperature and recyclability...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2018-04, Vol.223, p.10-15
Main Authors: Verma, Priyanka, Yuan, Kaile, Kuwahara, Yasutaka, Mori, Kohsuke, Yamashita, Hiromi
Format: Article
Language:English
Subjects:
Alcohols
Ammonia
Ammonia borane
Bimetallic nanoparticles
Bimetals
Catalysis
Catalysts
Catalytic activity
Chemical energy
Copper
Electron microscopy
Energy conversion
Gold
Hydrogen
Hydrogen production
Hydrogen storage materials
Mesoporous silica
Nanoparticles
Photocatalysis
Plasmonic catalyst
Platinum
Silica
Silicon dioxide
Silver
Surface plasmon resonance
Transmission electron microscopy
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Summary:[Display omitted] •A visible-light responsive PtAg bimetallic plasmonic catalyst was designed.•Catalysts were examined in hydrogen production from ammonia borane.•Significant activity enhancement was observed for Pt(0.25)/Ag/SBA-15 under visible light.•Effect of light, temperature and recyclability were explored. Recent advancements in plasmonic catalysis have witnessed rapid developments in solar-to-chemical energy conversion utilizing Ag, Au and Cu metal nanoparticles (NPs). In this study, visible light responsive bimetallic Pt/Ag nanocatalyst supported on mesoporous silica, was successfully prepared by a two-step method viz. MW assisted alcohol reduction, followed by Pt deposition by the assistance of localized surface plasmon resonance (LSPR) effect of Ag NPs. The obtained catalysts were characterized by UV–vis, transmission electron microscopy (TEM), XAFS, XPS and N2-physisorption measurement studies. The performance of prepared catalysts was explored for the visible light enhanced catalytic activity in the hydrogen (H2) production from ammonia borane (NH3-BH3: AB). A great enhancement for Pt(0.25)/Ag/SBA-15 (0.25wt% of Pt on 1.0wt% of Ag) was observed by a factor of 2.8, which is highest among our previously reported results of spherical bimetallic NPs. A plausible photocatalytic and charge separation mechanism has been proposed to envisage the tentative reaction pathway.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2017.05.017