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Optimised Photocatalytic Hydrogen Production Using Core-Shell AuPd Promoters with Controlled Shell Thickness

DOI: 10.1039/C4CP04693E DOI Help

Authors: Wilm Jones (The UK Catalysis Hub, Research Complex at Harwell, U.K.) , Ren Su (Research Complex at Harwell) , Peter Wells (The UK Catalysis Hub, Research Complex at Harwell,U.K.) , Yanbin Shen (Aarhus University) , Nikolaos Dimitratos (The UK Catalysis Hub, Research Complex at Harwell, U.K.) , Michael Bowker (The UK Catalysis Hub, Research Complex at Harwell, U.K.) , David Morgan (Cardiff University, U.K.) , Bo Brummerstedt Iversen (Aarhus University) , Arunabhiram Chutia (University College London) , Flemming Besenbacher (Aarhus University, Denmark) , Graham Hutchings (The UK Catalysis Hub, Research Complex at Harwell, U.K.)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Chemistry Chemical Physics

State: Published (Approved)
Published: October 2014
Diamond Proposal Number(s): 8071

Abstract: The development of efficient photocatalytic routines for producing hydrogen is of great importance as society moves away from energy sources derived from fossil fuels. Recent studies have identified that the addition of metal nanoparticles to TiO2 greatly enhances the photocatalytic performance of these materials towards the reforming of alcohols for hydrogen production. The core–shell structured Au–Pd bimetallic nanoparticle supported on TiO2 has being of interest as it exhibited extremely high quantum efficiencies for hydrogen production. However, the effect of shell composition and thickness on photocatalytic performance remains unclear. Here we report the synthesis of core–shell structured AuPd NPs with the controlled deposition of one and two monolayers (ML) equivalent of Pd onto Au NPs by colloidal and photodeposition methods. We have determined the shell composition and thickness of the nanoparticles by a combination of X-ray absorption fine structure and X-ray photoelectron spectroscopy. Photocatalytic ethanol reforming showed that the core–shell structured Au–Pd promoters supported on TiO2 exhibit enhanced activity compared to that of monometallic Au and Pd as promoters, whilst the core–shell Au–Pd promoters containing one ML equivalent Pd provide the optimum reactivity.

Subject Areas: Chemistry, Energy


Instruments: B18-Core EXAFS