Abstract
Electrochemical redox capacity of a microbial fuel cell (MFC) electrode is an important factor in the power density. This study was conducted to investigate the redox capacity of surface modified anode and cathode electrodes by measuring their conductivities. An anode electrode was modified with nitric acid and a cathode electrode was modified with heat treatment. The anode electrode modified with 20 % of the nitric acid concentration showed the highest conductivity of 6.2 μS/cm/g and the maximum power density of 306.0 mW/m when used in a MFC. The cathode electrode modified at 472 °C for 18 min showed the highest conductivity of 5.2 μS/cm/g and the maximum power density of 276.2 mW/m when used in a MFC. On the other hand, an MFC using both the electrodes showed the highest maximum power density of 408.2 mW/m. Meanwhile, a control MFC without modified electrodes generated very small voltage (0.014 mV), so the power density could not be measured.
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