  The dynamic covalent properties of graphene oxide (GO) are of fundamental
interest to a broad range of scientific areas and technological applications.
It remains a challenge to access the feasible dynamic reactions for reversibly
breaking/reforming covalent bonds of oxygen functional groups on GO, although
these reactions can be induced by photonic or mechanical routes, or mediated by
adsorbed water. Here, using the density functional theory calculations, we
demonstrate the remarkably enhanced dynamic oxygen migration along the basal
plane of GO supported by copper substrate (GO@copper), with the C-O bond
breaking reaction and proton transfer between the neighboring epoxy and
hydroxyl groups. Compared to that on GO, the energy barrier of oxygen migration
on GO@copper is sharply reduced to be less than or comparable to thermal
fluctuations, and meanwhile the crystallographic match between GO and copper
substrate induces new oxygen migration paths on GO@copper. This work sheds
light on the understanding of metal substrate-enhanced dynamic properties of
GO, and evidences the strategy to tune the activity of
two-dimension-interfacial oxygen groups for various potential applications.
