Reduced graphene oxide improves the performance of a methanogenic biocathode

Graphene-based biocathodes enhance the kinetics of electrochemical conversion CO 2 into bio-methane in comparison to conventional biocathodes. It also promotes biomass development. • Graphene oxide electrode modifications improve methanogenic processes MES systems. Methanobacterium genus is a dominant hydrogenotrophic Archaea found Methane can be produced by means at concentrations above 95%. Microbial electrosynthesis (MES), sub-branch bioelectrochemical processes, takes advantage certain type electroactive microorganism produce added value products (such as methane) from carbon dioxide (CO ). The aim this study quantify benefits using felt modified with reduced graphene-oxide (rgoCF) biocathode. current density generated rgoCF was almost 30% higher than control (CF). In addition, charge transfer and ohmic resistances were, on average, 50% lower electrode. These improvements were accompanied larger presence bacteria (31% larger) archaea (18% microbial communities dominated ( ) and, lesser extent, low-diversity group both Finally, it estimated that for feeding rate range 15–30 g per m day, possible high-quality biogas (>95% methane concentration).