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Direct assessment of the acidity of individual surface hydroxyls on oxides using non-contact AFM
Date
April 7, 2021
The state of de/protonation of surfaces has far-ranging implications in chemistry: from acid-base catalysis and the electro- and photocatalytic splitting of water, to the behavior of minerals and biochemistry. We assess the acidity of individual hydroxyls on In2O3(111), a model oxide with four different types of surface oxygen atoms. We probe the strength of their hydrogen bond with the tip of a non-contact atomic force microscope (nc-AFM) and find quantitative agreement with density-functional theory (DFT) calculations. By relating the results to known proton affinities (PA) of gas-phase molecules, we determine the PA of different surface sites of In2O3 with atomic precision. Measurements on hydroxylated TiO2 and zirconia extend our method to other oxides.
In2O3-terminated AFM tip probing a surface hydroxyl.
Presenter
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