Enhanced performance and capacitance behavior of anode by rolling Fe3O4 into activated carbon in microbial fuel cells

► A novel anode is made by rolling Fe3O4 into activated carbon on stainless steel mesh. ► The addition of Fe3O4 in anode increases the maximum power density by 22%. ► The anode modified by Fe3O4 is kinetically more advantageous according to Tafel test. ► The capacitance of the anode is increased after Fe3O4 modification.