Comparison of the MFCs performance according to the anode type and the activity of the H2-producing cultures. (a,
b) Power density profiles (normalized by anode area), (c) maximum current density and potential, (d) Coulombic and energy
efficiencies, (e, f) maximum power density normalized by cathode area. (Note: CC-NHT, carbon cloth and non-heat
treatment for seed sludge; CC-HT, carbon cloth and heat treatment; GB-NHT, graphite fiber brush and non-heat treatment;
GB-HT, graphite fiber brush and heat treatment, Rext [ 980 U). Duplicate reactors were used.