Sorry that's not your question, but:
Science too works with fashions and buzzwords like graphene. Fashions get oldfashioned - think at fractals for instance. There is no guarantee - or indeed, few chances - that energy storage in graphene spreads from academia to industry, and the most probable is that it will be over in some years.
So if you want to do this, maintain and develop other skills too, as you'll probably have to adapt.