Publication date: 10th April 2024
Complex oxides have evolved as a major class of functional applied in a wide range of energy conversion and storage approaches as well as electronic devices, which harvest the ability to precisely tailor and combine oxides on the nanoscale. Here, miniaturization and confinement phenomena can occur that determine the ionic-electronic structure of oxide thin films, surfaces, and 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. We will specifically discuss how solid state ionics phenomena in oxide thin films can be exploited to trigger structural, electronic, and magnetic phase transitions [1] and discuss means to control the dynamics of oxygen exchange in such nanoscaled oxides. Finally, we link space-charge phenomena along and across electrochemically active oxide interfaces, with particular focus on the role of space charge at solid-liquid interfaces operating in alkaline water splitting. We will discuss materials engineering strategies that allow to overcome the limitations of ‘bulk catalyst’ owing to intrinsic scaling relations and the typically observed inverse relationship of catalyst activity and long term stability. [2,3]
[1] S. He et al., Adv. Func. Mater., in press (2024)
[2] Weber et al., JACS (2022);
[3] Heymann et al., ACS Appl. Mater. Interf. (2022)
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