Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.048
Publication date: 18th July 2023
Complex oxides have evolved as a major class of functional energy materials applied in a wide range of energy conversion and storage approaches which harvest the ability to precisely tailor and combine oxides on the nanoscale. Heterogeneous interfaces of oxides typically possess distinctly different material properties as compared to the bulk [1] 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. 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] As we elaborate the choice and combination of select oxides in from of defined multilayers and superlattices can lead to superior stability compared to the parent materials. [3,4] In this way, the control of space charge and electronic structure can be used to realize hybrid catalysts that attempt to break classical relations of electrochemical activity and stability.
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