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Instruments / Technical Area	Publication Details	Published	Actions
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS	A combined laboratory and synchrotron in-situ photoemission study of the rutile TiO2 (110) / water interface Conor Byrne , Khadisha Marie Zahra , Simran Dhaliwal , David C. Grinter , Kanak Roy , Wilson Garzon , Georg Held , Geoff Thornton , Alex Walton Journal Of Physics D: Applied Physics DOI: 10.1088/1361-6463/abddfb Diamond Proposal Number(s): [23855] Open Access Show Abstract ▼ Abstract: In-situ analysis of the TiO2 / water interface via NAP-XPS is demonstrated in both a lab based system (NAP-cell configuration) and synchrotron endstation (backfill configuration). Ultra-thin wetting layers (UTWL) of liquid water (~10 nm) are formed on a rutile TiO2 surface with minimal contamination present in addition to unique insight during the growth of the liquid films as indicated via NAP-XPS, in-situ sample temperature and background vapour pressure monitoring. Chemical changes at the solid / liquid interface are also demonstrated via healing of Ti3+ surface defect states. Photon depth profiling of the as grown liquid layers indicate that the formed films are ultra-thin (~10 nm) and likely to be continuous in nature. This work demonstrates a novel and flexible approach for studying the solid / liquid interface via NAP-XPS which is readily integrated with any form of NAP-XPS system, thereby making a critical interface of study available to a wide audience of researchers for use in operando electrochemical and photocatalytic research.	Jan 2021
I06-Nanoscience (XPEEM)	Redox behaviour of a ceria-zirconia inverse model catalyst Michael Allan , David Grinter , Simran Dhaliwal , Chris Muryn , Thomas Forrest , Francesco Maccherozzi , Sarnjeet S. Dhesi , Geoff Thornton Surface Science 682, 8-13 DOI: 10.1016/j.susc.2018.12.005 Diamond Proposal Number(s): [17343] Show Abstract ▼ Abstract: The redox behaviour modification following the addition of zirconia to ceria nanostructures supported on Rh(111) has been investigated using a combination of Low Energy Electron Diffraction (LEED) and X-ray Photoemission Electron Microscopy (XPEEM). Soft X-ray irradiation was employed to reduce ZrO2-x(111) supported on Rh(111) and, by introducing oxygen, the reoxidation process of the thin film was monitored. CeO2(111) was then deposited on zirconia/Rh(111) and, using XPEEM, we determined that the mixed metal oxide formed a phase-separated structure with CeO2(111) nanoparticles on top of the zirconia. Upon exposure of CeO2-x/ZrO2-x/Rh(111) to X-ray illumination, the zirconia no longer undergoes any observable reduction while at the same time the ceria is reduced. Our results indicate a synergy between the zirconia and ceria in the phase-separated system expected in the working catalyst, with oxygen transfer between the metal oxides. This sheds light on the mechanism of the enhancement of catalytic properties seen with the addition of zirconia to ceria and highlights the oxygen storage and release ability of ceria.	Apr 2019

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