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Updated: Jul 19, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
Calculated phase diagrams for the electrochemical oxidation and reduction of water over Pt(111)
Jan Rossmeisl1, Jens K Nørskov, Christopher D Taylor
1Center for Atomic-scale Materials Physics, NanoDTU, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark.
Abstract:
Ab initio density functional theory is used to calculate the electrochemical phase diagram for the oxidation and reduction of water over the Pt(111) surface. Three different schemes proposed in the literature are used to calculate the potential-dependent free energy of hydrogen, water, hydroxyl, and oxygen species adsorbed to the surface. Despite the different foundations for the models and their different complexity, they can be directly related to one another through a systematic Taylor series expansion of the Nernst equation. The simplest model, which includes the potential only as a shift in the chemical potential of the electrons, accounts very well for the thermochemical features determining the phase-diagram.
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