Abstract
This investigation evaluated the efficacy of microbial fuel cell (MFC) employing cathode catalysed with reduced graphene oxide embedded on graphitic carbon nitride nanocomposite. The catalyst showed an excellent electrochemical response with a minimal charge transfer resistance of 11.5 Ω, compared to the conventional Pt/C (10.1 Ω). The physicochemical characterisation exhibited the existence of graphitic, pyridinic and pyrrolic N, which can accelerate oxygen reduction reaction. The MFC using cathode catalysed with graphitic carbon nitride supported over reduced graphene oxide (rGO-GCN) nanocomposite showcased an excellent performance with 15.72 W/m3 of maximum power density, 84.10% of organic matter removal, and 33.75% of coulombic efficiency that was superior to MFC using Pt/C catalysed cathode (26.94%). Additionally, the poisoning test of rGO-GCN catalyst showed 1.33-times more relative current when poised with a 3 mM concentration of S2-. The results of this investigation revealed that the synthesised catalyst is suitable for field-scale applications with 26-folds lower synthesis cost (1.24 $/g) compared to commercial Pt/C.
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