Free energy of proton transfer at the water–TiO2 interface from ab initio deep potential molecular dynamics

• Published in: Chemical science (Cambridge) Vol. 11; no. 9; pp. 2335 - 2341
• Main Authors: Calegari Andrade, Marcos F, Hsin-Yu, Ko, Zhang, Linfeng, Car, Roberto, Selloni, Annabella
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 07.03.2020; The Royal Society of Chemistry
• Subjects: Adsorption; Artificial neural networks; Chemistry; Computer simulation; Free energy; Geochemistry; Hydroxyl groups; Molecular dynamics; Photocatalysis; Protons; Room temperature; Surface chemistry; Titanium dioxide
• ISSN: 2041-6520; 2041-6539
• DOI: 10.1039/c9sc05116c

TiO2 is a widely used photocatalyst in science and technology and its interface with water is important in fields ranging from geochemistry to biomedicine. Yet, it is still unclear whether water adsorbs in molecular or dissociated form on TiO2 even for the case of well-defined crystalline surfaces. To address this issue, we simulated the TiO2–water interface using molecular dynamics with an ab initio-based deep neural network potential. Our simulations show a dynamical equilibrium of molecular and dissociative adsorption of water on TiO2. Water dissociates through a solvent-assisted concerted proton transfer to form a pair of short-lived hydroxyl groups on the TiO2 surface. Molecular adsorption of water is ΔF = 8.0 ± 0.9 kJ mol−1 lower in free energy than the dissociative adsorption, giving rise to a 5.6 ± 0.5% equilibrium water dissociation fraction at room temperature. Due to the relevance of surface hydroxyl groups to the surface chemistry of TiO2, our model might be key to understanding phenomena ranging from surface functionalization to photocatalytic mechanisms.