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Updated: Jun 14, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
Published on: April 12, 2019
Inaccuracy of density functional theory calculations for dihydrogen binding energetics onto Ca cation centers
Janghwan Cha1, Seokho Lim, Cheol Ho Choi
1Department of Applied Physics, Dankook University, Yongin-si 448-701, Korea.
Abstract:
We investigate the mechanism of dihydrogen adsorption onto Ca cation centers, which has been the significant focus of recent research for hydrogen storage. We particularly concentrate on reliability of commonly used density-functional theories, in comparison with correlated wave function theories. It is shown that, irrespective of the chosen exchange-correlation potentials, density-functional theories result in unphysical binding of H2 molecules onto Ca1+ system. This suggests that several previous publications could contain a serious overestimation of storage capacity at least in part of their results.
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