NOVELTY - Fabricating (M1) of electrodes in biofuel cells and fuel cells involves: creating aqueous buffer solution comprising water and buffer material having a molecular structure defined by a first end, a second end, and a middle disposed between the first end and the second end; mixing carbon nanotubes (CNTs) in the aqueous buffer solution in ratio of up to approximately 1 mg where a resulting solution includes dispersed CNTs; and mixing metal-core ferritins into the resulting solution, where at least a portion of the ferritins are coupled to the CNTs.    USE - For fabricating electrodes in biofuel cells and fuel cells (claimed).    ADVANTAGE - The fabrication method uses catalyst which is not well-dispersed through chemical and/or electrochemical deposition on the CNTs, and transports generated protons to a proton exchange membrane. The method uses safe-to-handle aqueous buffer solution which provides excellent CNT dispersion without use of additives that tend to wrap themselves about CNTs; uses ferritin proteins as the catalyst vehicle on a CNT support which provides electrodes for both biofuel cell and fuel cell applications. The catalytic effects of the resulting electrodes can be further enhanced by simple sonication to redistribute and re-shape the metal particles on the CNTs. Conversely, the use and retention of the ferritin proteins on the electrode can improve proton transport through the protein shield to thus enhance the performance of the metal-core as a catalyst.    DETAILED DESCRIPTION - Fabrication (M1) of electrodes for use in biofuel cells and fuel cells involves: creating an aqueous buffer solution comprising water (at least 50 wt.%) and buffer material having a molecular structure defined by a first end, a second end, and a middle disposed between the first end and the second end (balance); mixing carbon nanotubes (CNTs) in the aqueous buffer solution in a ratio of up to approximately 1 mg of CNTs per 1 ml of the aqueous buffer solution where a resulting solution includes dispersed CNTs; and mixing metal-core ferritins into the resulting solution, where at least a portion of the ferritins are coupled to the CNTs. The first end defined by a cyclic ring with nitrogen and oxygen heteroatomes. The middle defined by a hydrophobic alkyl chain. The second end defined by a charged group. An INDEPENDENT CLAIM is included for an electrode for use in biofuel cells and fuel cells, comprising at least one (CNT); and at least one metal-core cationized ferritins electrostatically attached to the CNT.