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- W3041044024 abstract "Imidazole is a promising anhydrous proton conductor with a high conductivity comparable to that of water at a similar temperature relative to its melting point. Previous theoretical studies of the mechanism of proton transport in imidazole have relied either on empirical models or on ab initio trajectories that have been too short to draw significant conclusions. Here, we present the results of multiple time-step ab initio molecular dynamics simulations of an excess proton in liquid imidazole reaching 1 ns in total simulation time. We find that the proton transport is dominated by structural diffusion, with the diffusion constant of the proton defect being ∼8 times higher than that of self-diffusion of the imidazole molecules. By using correlation function analysis, we decompose the mechanism for proton transport into a series of first-order processes and show that the proton transport mechanism occurs over three distinct time and length scales. Although the mechanism at intermediate times is dominated by hopping along pseudo-one-dimensional chains, at longer times the overall rate of diffusion is limited by the re-formation of these chains. These results provide a more complete picture of the traditional idealized Grotthuss structural diffusion mechanism." @default.
- W3041044024 created "2020-07-16" @default.
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- W3041044024 date "2020-07-07" @default.
- W3041044024 modified "2023-09-25" @default.
- W3041044024 title "Elucidating the Proton Transport Pathways in Liquid Imidazole with First-Principles Molecular Dynamics" @default.
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- W3041044024 doi "https://doi.org/10.1021/acs.jpclett.0c01744" @default.
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