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Title: Real single ion solvation free energies with quantum mechanical simulation

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/c7sc02138k· OSTI ID:1390418

Single ion solvation free energies are one of the most important properties of electrolyte solutions and yet there is ongoing debate about what these values are. Only the values for neutral ion pairs are known. Here, we use DFT interaction potentials with molecular dynamics simulation (DFT-MD) combined with a modified version of the quasi-chemical theory (QCT) to calculate these energies for the lithium and fluoride ions. A method to correct for the error in the DFT functional is developed and very good agreement with the experimental value for the lithium fluoride pair is obtained. Moreover, this method partitions the energies into physically intuitive terms such as surface potential, cavity and charging energies which are amenable to descriptions with reduced models. Here, our research suggests that lithium's solvation free energy is dominated by the free energetics of a charged hard sphere, whereas fluoride exhibits significant quantum mechanical behavior that cannot be simply described with a reduced model.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1390418
Report Number(s):
PNNL-SA-123711; CSHCBM; KC0301050
Journal Information:
Chemical Science, Vol. 8, Issue 9; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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Cited By (13)

Cation−Solvent, Cation−Anion, and Solvent−Solvent Interactions with Electrolyte Solvation in Lithium Batteries journal January 2019
Large‐Sized Ammonia Clusters and Solvation Energies of the Proton in Ammonia journal September 2019
The Influence of Distant Boundaries on the Solvation of Charged Particles journal March 2019
Square planar or octahedral after all? The indistinct solvation of platinum( ii ) journal January 2018
Electrostatic solvation free energies of charged hard spheres using molecular dynamics with density functional theory interactions journal October 2017
Absolute proton hydration free energy, surface potential of water, and redox potential of the hydrogen electrode from first principles: QM/MM MD free-energy simulations of sodium and potassium hydration journal June 2018
Probing the Hofmeister series beyond water: Specific-ion effects in non-aqueous solvents journal June 2018
Understanding the scale of the single ion free energy: A critical test of the tetra-phenyl arsonium and tetra-phenyl borate assumption journal June 2018
Communication: Inside the water wheel: Intrinsic differences between hydrated tetraphenylphosphonium and tetraphenylborate ions journal November 2018
Ion hydration free energies and water surface potential in water nano drops: The cluster pair approximation and the proton hydration Gibbs free energy in solution journal November 2019
Quantifying the hydration structure of sodium and potassium ions: taking additional steps on Jacob's Ladder text January 2020
Cation−Solvent, Cation−Anion, and Solvent−Solvent Interactions with Electrolyte Solvation in Lithium batteries journal January 2019
Quantifying the Stability of the Hydronium Ion in Organic Solvents With Molecular Dynamics Simulations journal June 2019

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