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Title: Dynamic Stabilization of Metal Oxide–Water Interfaces

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.6b13096· OSTI ID:1345408

The interaction of water with metal oxide surfaces plays a crucial role in the catalytic and geochemical behavior of metal oxides. In a vast majority of studies, the interfacial structure is assumed to arise from a relatively static lowest energy configuration of atoms, even at room temperature. Using hematite (α-Fe2O3) as a model oxide, we show through a direct comparison of in situ synchrotron X-ray scattering with density functional theory-based molecular dynamics simulations that the structure of the (1102) termination is dynamically stabilized by picosecond water exchange. Simulations show frequent exchanges between terminal aquo groups and adsorbed water in locations and with partial residence times consistent with experimentally determined atomic sites and fractional occupancies. Frequent water exchange occurs even for an ultrathin adsorbed water film persisting on the surface under a dry atmosphere. The resulting time-averaged interfacial structure consists of a ridged lateral arrangement of adsorbed water molecules hydrogen bonded to terminal aquo groups. Surface pKa prediction based on bond valence analysis suggests that water exchange will influence the proton-transfer reactions underlying the acid/base reactivity at the interface. Our findings provide important new insights for understanding complex interfacial chemical processes at metal oxide–water interfaces.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI ID:
1345408
Journal Information:
Journal of the American Chemical Society, Vol. 139, Issue 7; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH

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Cited By (8)

Vibrational spectra of dissociatively adsorbed D 2 O on Al-terminated α-Al 2 O 3 (0001) surfaces from ab initio molecular dynamics journal June 2019
Thin water films covering oxide nanomaterials: Stability issues and influences on materials processing journal February 2019
Facet-dependent contaminant removal properties of hematite nanocrystals and their environmental implications journal January 2018
Absolute band alignment at semiconductor-water interfaces using explicit and implicit descriptions for liquid water journal October 2019
Vibrational spectroscopy of hydroxylated α-Al 2 O 3 (0001) surfaces with and without water: An ab initio molecular dynamics study journal July 2018
Enhanced photoelectrochemical water splitting of hematite multilayer nanowire photoanodes by tuning the surface state via bottom-up interfacial engineering journal January 2017
Facet-selective adsorption of Fe( ii ) on hematite visualized by nanoscale secondary ion mass spectrometry journal January 2019
Surface-Enhanced Raman Scattering-Active Substrate Prepared with New Plasmon-Activated Water journal May 2018

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