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- W4387607375 abstract "Abstract Improving materials for energy conversion and storage devices is deeply connected with an optimization of the surfaces of these materials. Surface modification has therefore emerged as a very promising strategy on the way to enhance modern energy technologies. This study shows that surface modification with ultra-thin oxide layers allows for a systematic tailoring of surface properties, in particular of the surface dipole and the work function, and it introduces the ionic potential of surface cations as a readily accessible descriptor for these effects. The combination of X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) illustrates that basic oxides with a lower ionic potential than the host material induce a positive surface charge and reduce the work function of a mixed conducting host material and vice versa . The emerging surface dipoles are caused by changes in the energy landscape, leading to redistribution of electronic charge density and/or a geometric reorientation of the surface. As a proof of concept that this strategy is widely applicable to tailor surface properties, we examined the effect of ultra-thin decoration layers on the oxygen exchange kinetics of pristine thin films of structurally and chemically different mixed conducting oxides in very clean conditions by means of in-situ impedance spectroscopy during pulsed laser deposition ( i -PLD). The extended study confirms that basic decorations with a reduced surface work function lead to a substantial acceleration of the oxygen exchange on a material's surface. Computational results suggest that the underlying mechanism of the kinetic improvement relies on a modification of the energetics of charged O 2 adsorbates and substantiate their importance for the oxygen exchange reaction." @default.
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- W4387607375 date "2023-10-13" @default.
- W4387607375 modified "2023-10-14" @default.
- W4387607375 title "Engineering surface dipoles on mixed conducting oxides with ultra-thin oxide decoration layers" @default.
- W4387607375 doi "https://doi.org/10.21203/rs.3.rs-3345186/v1" @default.
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