Electrochemical properties of a thermally expanded magnetic graphene composite with a conductive polymer

When a magnetic graphene composite derived from FeCl₃–graphite intercalation compounds was treated for 2 min at 900 °C, its capacitance increased. The deposition of polyaniline on it further increased the capacitance to be 253 F g⁻¹ at 5 mV s⁻¹.