Erlangen 2022 – wissenschaftliches Programm
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AKE: Arbeitskreis Energie
AKE 2: Systems Approach to Energy Supply
AKE 2.3: Vortrag
Dienstag, 15. März 2022, 14:15–14:30, AKE-H16
Space-charge-mediated phenomena at oxide interfaces for electrochemical water splitting — •Felix Gunkel1, Moritz Weber1, Lisa Heymann1, Anton Kaus1, and Christoph Baeumer2 — 1PGI-7, FZ Jülich — 2Twente University
Complex oxides have evolved as a major class of functional energy materials applied in a wide range of energy conversion and storage appraoches which harvest the ability to precisely tailor and combine oxides on the nanoscale. Heterogeneous interfaces of oxides enable the exchange of ionic and electronic defect species between the neighboring materials, giving rise to electronic-ionic charge transfer and space charge formation. Such space charge regions typically possess distinctly different material properties as compared to the bulk and allow tailoring and tuning of ionic-electronic properties by intentional design of interfaces. Here, we will discuss how dedicated design and understanding of interfacial space charge phenomena can be used to tailor electronic and ionic charge transport along and across electrochemically active oxide interfaces and surfaces, with particular focus on the role of space charge at solid-liquid interfaces operating in alkaline water splitting. As will be shown the dedicated control of the surface band structure of oxide catalysts via space charge can be used to mediate activity for oxygen evolution reaction, while the mass transport across the interface is responsible for the degradation and limited lifetime of the catalysts. In this way, the control of space charge and electronic structure can be used to realize hybrid catalysts that attempt to break classical scaling relations of electrochemical activity and stability.