Minimum interspatial electrode spacing to optimize air-cathode microbial fuel cell operation with a membrane electrode assembly

作者：Moon Jung Mi; Kondaveeti Sanath; Lee Tae Ho; Song Young Chae; Min Booki^*

来源：Bioelectrochemistry, 2015, 106: 263-267.

DOI：10.1016/j.bioelechem.2015.07.011

• Microbial fuel cell
• Electrochemical impedance spectroscopy
• Nation
• Oxygen mass transfer
• Interspatial distance

An optimum electrode spacing of less than 1 cm was determined for an air cathode microbial fuel cell (MFC) with a membrane electrode assembly (MEA) system. The lag period decreased as the electrode spacing increased and the voltage generation increased. Stable power density increased from 93 mW/m(2) to 248 mW/m(2) when the electrode distance increased from 0 mm to 9 mm. In the polarization test, a maximum power density (400 mW/m(2)) was obtained at a distance of 6 mm. The oxygen mass transfer coefficient (K-O = 4.60 x 10(-5) cm/s) with a 0 mm spacing was five times higher than that at a 9 mm spacing (0.89 x 10(-5) cm/s). Long-term operation of the MFC exhibited relatively stable anode potentials of -285 +/- 25 (0 mm) and -517 +/- 20 mV (3, 6, and 9 mm) and a gradual decrease in cathode potential for all distances, especially with 0-mm spacing. The performance of air cathode MFCs can be improved using minimum electrode spacing rather than no spacing.

• 出版日期2015-12