One-step ball milling-prepared nano Fe₂O₃ and nitrogen-doped graphene with high oxygen reduction activity and its application in microbial fuel cells

Abstract

• Nano Fe₂O₃ and N-doped graphene was prepared via a one-step ball milling method.

• The maximum power density of Fe-N-G in MFC was 390% of that of pristine graphite.

• Active sites like nano Fe₂O₃, pyridinic N and Fe-N groups were formed in Fe-N-G.

• The improvement of Fe-N-G was due to full exposure of active sites on graphene.

Developing high activity, low-cost and long durability catalysts for oxygen reduction reaction is of great significance for the practical application of microbial fuel cells. The full exposure of active sites in catalysts can enhance catalytic activity dramatically. Here, novel Fe-N-doped graphene is successfully synthesized via a one-step in situ ball milling method. Pristine graphite, ball milling graphene, N-doped graphene and Fe-N-doped graphene are applied in air cathodes, and enhanced performance is observed in microbial fuel cells with graphene-based catalysts. Particularly, Fe-N-doped graphene achieves the highest oxygen reduction reaction activity, with a maximum power density of 1380±20 mW/m² in microbial fuel cells and a current density of 23.8 A/m² at –0.16 V in electrochemical tests, which are comparable to commercial Pt and 390% and 640% of those of pristine graphite. An investigation of the material characteristics reveals that the superior performance of Fe-N-doped graphene results from the full exposure of Fe₂O₃ nanoparticles, pyrrolic N, pyridinic N and excellent Fe-N-G active sites on the graphene matrix. This work not only suggests the strategy of maximally exposing active sites to optimize the potential of catalysts but also provides promising catalysts for the use of microbial fuel cells in sustainable energy generation.

Graphical abstract

Keywords

Microbial fuel cells / Air cathodes / Nano Fe ₂O ₃ and nitrogen-doped graphene / Oxygen reduction reaction

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