Issue 19, 2020

Water dynamics at electrified graphene interfaces: a jump model perspective

Abstract

The reorientation dynamics of water at electrified graphene interfaces was recently shown [J. Phys. Chem. Lett., 2020, 11, 624-631] to exhibit a surprising and strongly asymmetric behavior: positive electrode potentials slow down interfacial water reorientation, while for increasingly negative potentials water dynamics first accelerates before reaching an extremum and then being retarded for larger potentials. Here we use classical molecular dynamics simulations to determine the molecular mechanisms governing water dynamics at electrified interfaces. We show that changes in water reorientation dynamics with electrode potential arise from the electrified interfaces' impacts on water hydrogen-bond jump exchanges, and can be quantitatively described by the extended jump model. Finally, our simulations indicate that no significant dynamical heterogeneity occurs within the water interfacial layer next to the weakly interacting graphene electrode.

Graphical abstract: Water dynamics at electrified graphene interfaces: a jump model perspective

Supplementary files

Article information

Article type
Paper
Submitted
21 ⵉⵏⵏ 2020
Accepted
25 ⴱⵕⴰ 2020
First published
26 ⴱⵕⴰ 2020

Phys. Chem. Chem. Phys., 2020,22, 10581-10591

Author version available

Water dynamics at electrified graphene interfaces: a jump model perspective

Y. Zhang, G. Stirnemann, J. T. Hynes and D. Laage, Phys. Chem. Chem. Phys., 2020, 22, 10581 DOI: 10.1039/D0CP00359J

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