An enzymatic biofuel cell based on electrochemically reduced graphene oxide and multiwalled carbon nanotubes/zinc oxide modified electrode

Here we present the design and study of a simple biofuel cell consisting of a glucose oxidase (GOx)-based bioanode and a laccase based bio cathode. Ferrocene monocarboxilic acid (FMCA) was used as a mediator for the bio anode to enhancing the electron transfer at the glassy carbon electrode (GCE) surface. GOx was co immobilized at electrochemically reduced graphene oxide (ERGO) by simple electrochemical approach, and the Laccase was incorporated in multiwalled carbon nanotube/Zinc oxide composite modified GCE. The morphological studies of the bio anode and bio cathode have been investigated by scanning electron microscope (SEM). The electroanalytical properties of each modified bioelectrodes have been investigated by the cyclic voltammetry. The redox potential of the each enzyme as used to set up the open circuit potential. The fabricated biofuel cell delivers a power density up to 54 nW cm^-2 and an open circuit voltage of 0.055 V, under the physiological conditions (pH 7).