Linking Charge Carrier Dynamics and Liquid Phase Oxidation Catalysis in Spinel and Perovskite Oxides (B03)

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Both the OER and thermal 2-propanol oxidation require transferring electrons from bulk solution to charge separated states at the catalyst surface and either back to solution phase product species (thermal 2-propanol oxidation) or to the cathode (the OER). Project B03 considers these reactions on CoxFe3-xO4 spinels and LaCoxFe1-xO3 perovskites employing a suite of optical operando techniques: transient absorption, photoluminescence, Raman and several types of vibrationally and electronically resonant sum frequency generation spectroscopy. The combination of these methods enables the observation of every step in the electron's journey in real-time and thus provides a description of how elementary processes on timescales from femtoseconds to seconds influence catalyst activity.