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Main_SI_H_species_transport_chemrxiv.pdf (3.86 MB)

On the Chemistry and Mobility of Hydrogen in the Interstitial Space of Layered Crystals H-BN, MoS2 and Graphite

preprint
submitted on 10.12.2018 and posted on 10.12.2018 by Agnieszka Kuc, Yun An, Petko Petkov, Marcelo Lozada-Hidalgo, Thomas Heine

Recent experiments have demonstrated transport and separation of hydrogen isotopes in layered materials, such as hexagonal boron nitride and molybdenum disulphide. Here, based on first-principles calculations combined with well-tempered metadynamics simulations, we report the chemical interactions and mobility of protons (H+) and protium (H atoms) in the interstitial space of these layered materials. We show that both H+ and H can be transported between the layers of h-BN and MoS2 with low free energy barriers, while they are immobilized in graphite, in accordance with the experimental observations. In h-BN and MoS2, the transport mechanism involves a hopping process between the adjacent layers, which is assisted by the low- energy phonon shear modes. Defects present in MoS2 suppress the transport and act as traps for H species.

History

Email Address of Submitting Author

a.kuc@hzdr.de

Institution

Helmholz-Zentrum Dresden-Rossendorf

Country

Germany

ORCID For Submitting Author

0000-0002-9458-4136

Declaration of Conflict of Interest

No conflict of interest

Version Notes

Final draft submitted to journal

Licence

Exports