“…The anode has been regarded as an important factor that influences power output of MFCs by governing attachment of microorganisms to its surface, electron transfer efficiency and substrate oxidation although the performance of MFCs depends on the complex parameters of MFCs governing the overpotentials and ohmic losses (Zhang et al, 2011;Zhou et al, 2012). The anode reaction of MFCs is affected by the biocompatability, porosity and surface area, and electronic conductivity of the anode materials (Song et al, 2009;Wei et al, 2011;Zhou et al, 2011;Kumar et al, 2013). Therefore, several surface modifications of anode such as ammonia treatment, acid or heat treatment, and electrochemical oxidation have been tried to improve the anode performance (Wei et al, 2011;Zhou et al, 2012;Kumar et al, 2013), and the power production of MFCs was substantially increased to several watts per square meters of anode surface area.…”