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In the Supporting Information[1] it says that the graphene acid they used was made from "commercial Fluorinated graphene oxide".

So I imagine that is not a huge issue.

IIRC there is only one lab which produces grapheme efficiently enough for research purposes, which supplies many other researches.

When many labs will efficiently produce graphene, we will have made a step towards small-scale industrial production. Not yet, AFAICT.

You can buy Li-Ion batteries for drones, robots, RC, etc. that claim to use graphene. Turnigy, for example.