Abstract
The sluggish oxygen reduction reaction (ORR) is a significant hurdle against microbial fuel cell (MFC) performance. Polyoxometalates are excellent candidates to address this challenge because they have the potential of improving ORR efficiency. Here, cesium phosphomolybdate was successfully synthesized through a facile solid-state method and then used as an ORR catalyst on a graphite cathode in an MFC with sodium acetate as the substrate in the anolyte. The CV analysis demonstrated that modified graphite has two ORR peaks at −0.25, −0.5 V vs Ag/AgCl and a higher current density than the bare graphite. The MFC equipped with the modified cathode displayed a maximum power density of 64.73 mW m−2, higher than that obtained for bare graphite (42 mW m−2). COD removal efficiencies in MFCs with modified and bare graphite cathodes were 86.4% and 85%, respectively which are similar to or better than what is published in the literature. This study offers an efficient ORR catalyst in MFC applications helping in using organic wastewater as a fuel by converting the chemical energy into electricity.
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