Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
I will demonstrate how electron and x-ray spectroscopy can be used to address fundamental questions regarding the reaction mechanism and active sites of the Oxygen Evolution Reaction (OER), Hydrogen Evolution Reaction (HER) and CO2 reduction reaction (CO2RR). We have developed in-situ X-ray Photoelectron Spectroscopy (XPS) capabilities using a membrane assembly where either the anode or cathode side is exposed to a differential pumped environments where direct measurements of the changes in the catalyst and various reaction intermediates can be probed during OER on IrO2 and HER conditions for MoS2. We have also recently conducted high-energy resolution fluorescence detection (HERFD) in X-ray Absorption Spectroscopy (XAS) studies of the Fe and Ni K-edges under OER conditions in the highly active Ni-Fi oxyhydroxides to determine the nature of the active sites. In particular we observe that Fe encounter an extremely strained local geometry when Ni undergoes a transformation from the 2+ to 3+ state. We have followed the change of Cu catalyst after oxidative activation and then reduction into the metallic state using XAS and ambient pressure XPS to elucidate the nature of the enhanced selectivity towards ethylene in CO2RR.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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