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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	Pd local structure and size correlations on the activity of Pd/ TiO2 for photocatalytic reforming of methanol Hasliza Bahruji , Norli Abdullah , Scott M. Rogers , Peter P. Wells , C. Richard A. Catlow , Michael Bowker Physical Chemistry Chemical Physics DOI: 10.1039/C9CP00826H Diamond Proposal Number(s): [10306] Open Access Show Abstract ▼ Abstract: The interaction between Pd and TiO2 for promoting photocatalytic activity was investigated by tailoring the size of Pd nanoparticles and monitoring the photocatalytic activity of methanol photo-reforming reaction for hydrogen gas production. We show that at 0.6 % wt. Pd loading, catalyst with highly dispersed nanoparticles obtained at 1 oC temperature exhibits superior photocatalytic activity for hydrogen gas production. At different weight of Pd loading, tailoring two sets of catalysts with different structural properties provide correlation between the changes of Pd local structures with the rate of hydrogen production. The impact of controlling the structural properties of metal nanoparticles in influencing H2 production outweighs the effect of metal loading variation. The differences of Pd/TiO2 activity at the variation of metal loading were correlated with the changes in Pd local structure consequently affecting electronic transfer and photocatalytic efficiency.	Jun 2019
I20-Scanning-X-ray spectroscopy (XAS/XES)	Extracting structural information of Au colloids at ultra-dilute concentrations: identification of growth during nanoparticle immobilization George F. Tierney , Donato Decarolis , Norli Abdullah , Scott M. Rogers , Shusaku Hayama , Martha Briceno De Gutierrez , Alberto Villa , C. Richard A. Catlow , Paul Collier , Nikolaos Dimitratos , Peter Wells Nanoscale Advances 4 DOI: 10.1039/C9NA00159J Diamond Proposal Number(s): [17283] Open Access Show Abstract ▼ Abstract: Sol-immobilization is increasingly used to achieve supported metal nanoparticles (NPs) with controllable size and shape; it affords a high degree of control of the metal particle size and yields a narrow particle size distribution. Using state-of-the-art beamlines, we demonstrate how X-ray absorption fine structure (XAFS) techniques are now able to provide accurate structural information on nano-sized colloidal Au solutions at μM concentrations. This study demonstrates: (i) the size of Au colloids can be accurately tuned by adjusting the temperature of reduction, (ii) Au concentration, from 50 μM to 1000 μM, has little influence on the average size of colloidal Au NPs in solution and (iii) the immobilization step is responsible for significant growth in Au particle size, which is further exacerbated at increased Au concentrations. The work presented demonstrates that an increased understanding of the primary steps in sol-immobilization allows improved optimization of materials for catalytic applications.	May 2019

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