From these results, it is clear that power density increases with
decrease in the electrode spacing. The ohmic losses in SMFC depend
upon electrode spacing. For reduced distance between the electrodes,
the protons have less distance to travel, and hence due
to reduction in ohmic resistance power generation increased. Liu
et al. (2005) reported that power increased by approximately 60%
when electrode spacing was decreased from 4 to 2 cm in a singlechamber
MFC, due to the decrease in internal resistance. Hong et al.
(2009a) reported that in sediment MFCs, when the electrode spacing
was decreased from 100 cm to 12 cm, the maximum power
density increased from 0.37 to 1.01 mWm−2.