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Yuan Liu, Zhimei Liu, Hong Liu, Meiling Liao
This work synthesizes nitrogen-doped graphene/carbon black (NG/CB) composites as oxygen reduction reaction (ORR) electrocatalysts for microbial fuel cells using a novel template-like method. Carbon black serves as a conductive backbone and spacer to prevent graphene restacking, while cetyltrimethylammonium bromide acts as a molecular bridge. The optimized NG/CB-10 composite (GO:CB mass ratio 10:1) achieves 4-electron ORR pathway in neutral pH, with maximum MFC power density of 936 mW·m⁻², matching platinum/carbon performance at 25% lower cost.
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To improve the power generation of a microbial fuel cell (MFC), a porous nitrogen-doped graphene/carbon black (NG/CB) composite as efficient oxygen reduction reaction (ORR) electrocatalyst was successfully synthesized by pyrolyzing graphene oxide (GO) encapsulated CB with cetyltrimethyl ammonium bromide as a bridge. This concept-to-proof synthesis can be considered as a template-like method. Based on this method, one composite named as NG/CB-10 was acquired using the optimized GO-to-CB mass ratio of 10:1. Electrochemical tests demonstrate that NG/CB-10 can catalyze ORR in neutral-pH medium through a four-electron pathway with positively shifted the onset potential, the enhanced current density and reduced charge transfer resistance. CB addition also prolongs the stability of NG/CB-10. The enhancement in electrochemical performance of NG/CB-10 was attributed to the enlarged surface area, abundant mesopores and high content of pyridinic nitrogen. The maximum power density of MFC equipping NG/CB-10 as cathode electrocatalyst reached 936 mW·m−2, which was 26% higher than that of NG and equal to that of platinum/carbon. The cost of NG/CB-10 was reduced by 25% compared with that of NG. This work provides a novel method to synthesize promising ORR electrocatalyst for MFC in the future.