Reduced graphene oxide/polyaniline electrochemical supercapacitors fabricated by laser

•Graphene oxide was reduced through a simple, cost-effective and one-step procedure.•Laser-rGO: open and accessible structure of graphene sheets with high surface area.•Laser-rGO was functionalized with electrodeposited polyaniline nanofibers.•PANI nanofibers prevent the restacking and agglomeration of the laser-rGO sheets.•PANI nanofibers extend further the electrode surface and provide it with a strong pseudocapacitance.