Surface chemistry on a polarizable surface: Coupling of CO with KTaO 3 (001). Wang, Z., Reticcioli, M., Jakub, Z., Sokolović, I., Meier, M., Boatner, L. A., Schmid, M., Parkinson, G. S., Diebold, U., Franchini, C., & Setvin, M. Science Advances, 8(33):2–8, aug, 2022. ![Surface chemistry on a polarizable surface: Coupling of CO with KTaO 3 (001) [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Polarizable materials attract attention in catalysis because they have a free parameter for tuning chemical reactivity. Their surfaces entangle the dielectric polarization with surface polarity, excess charge, and orbital hybridization. How this affects individual adsorbed molecules is shown for the incipient ferroelectric perovskite KTaO 3 . This intrinsically polar material cleaves along (001) into KO- and TaO 2 -terminated surface domains. At TaO 2 terraces, the polarity-compensating excess electrons form a two-dimensional electron gas and can also localize by coupling to ferroelectric distortions. TaO 2 terraces host two distinct types of CO molecules, adsorbed at equivalent lattice sites but charged differently as seen in atomic force microscopy/scanning tunneling microscopy. Temperature-programmed desorption shows substantially stronger binding of the charged CO; in density functional theory calculations, the excess charge favors a bipolaronic configuration coupled to the CO. These results pinpoint how adsorption states couple to ferroelectric polarization.
@article{Wang2022,
abstract = {Polarizable materials attract attention in catalysis because they have a free parameter for tuning chemical reactivity. Their surfaces entangle the dielectric polarization with surface polarity, excess charge, and orbital hybridization. How this affects individual adsorbed molecules is shown for the incipient ferroelectric perovskite KTaO 3 . This intrinsically polar material cleaves along (001) into KO- and TaO 2 -terminated surface domains. At TaO 2 terraces, the polarity-compensating excess electrons form a two-dimensional electron gas and can also localize by coupling to ferroelectric distortions. TaO 2 terraces host two distinct types of CO molecules, adsorbed at equivalent lattice sites but charged differently as seen in atomic force microscopy/scanning tunneling microscopy. Temperature-programmed desorption shows substantially stronger binding of the charged CO; in density functional theory calculations, the excess charge favors a bipolaronic configuration coupled to the CO. These results pinpoint how adsorption states couple to ferroelectric polarization.},
author = {Wang, Zhichang and Reticcioli, Michele and Jakub, Zdenek and Sokolovi{\'{c}}, Igor and Meier, Matthias and Boatner, Lynn A. and Schmid, Michael and Parkinson, Gareth S. and Diebold, Ulrike and Franchini, Cesare and Setvin, Martin},
doi = {10.1126/sciadv.abq1433},
issn = {2375-2548},
journal = {Science Advances},
mendeley-groups = {Ferro-Electricity/adsorption,catalysis and adsorption/CO,PEROVSKITES/KTaO3,POLARONS/inMaterials},
month = {aug},
number = {33},
pages = {2--8},
title = {{Surface chemistry on a polarizable surface: Coupling of CO with KTaO 3 (001)}},
url = {https://www.science.org/doi/10.1126/sciadv.abq1433},
volume = {8},
year = {2022}
}
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At TaO 2 terraces, the polarity-compensating excess electrons form a two-dimensional electron gas and can also localize by coupling to ferroelectric distortions. TaO 2 terraces host two distinct types of CO molecules, adsorbed at equivalent lattice sites but charged differently as seen in atomic force microscopy/scanning tunneling microscopy. Temperature-programmed desorption shows substantially stronger binding of the charged CO; in density functional theory calculations, the excess charge favors a bipolaronic configuration coupled to the CO. 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