Method for producing graphene fibres

Abstract

The invention relates to a method for producing graphene fibres, comprising the following steps: a. providing single- or multi-layer graphene or graphene oxide platelets based on graphene or graphene oxide; b applying a transition metal or a transition metal oxide to the graphene or graphene oxide platelets by means of a deposition method; c. spinning, in particular wet-spinning or dry-spinning, a graphene fibre or graphene oxide fibre by injecting a spinning solution, in which the graphene or graphene oxide platelets obtained in step b) are dispersed; d. treating, in particular reducing, the graphene fibre or the graphene oxide fibre in a process atmosphere containing a reducing agent, in particular hydrogen, at a determined treatment temperature; wherein, where there is a graphene oxide fibre, this is reduced to form a graphene fibre, wherein the graphene fibre or graphene oxide fibre is treated in such a way that the transition metal oxide in step d) is only partially reduced or the transition metal in a step following step d) is partially oxidised, wherein the partial reducing or partial oxidation occurs, in particular in such a way that there is a certain proportion of the transition metal oxide in the finished graphene fibre that is smaller than the proportion of the transition metal, in particular smaller than 10 wt. %.