biostudies-literatureNing HMinistry of Housing and Urban-Rural Development30145-30156https://www.ebi.ac.uk/biostudies/studies/S-EPMC9589823biostudies-literatureUnknown12(46)In this study, Fe/N codoped porous graphitic carbon derived from macadamia shells was prepared at different temperatures as cathodic catalysts for microbial fuel cells (MFCs), with K₂FeO₄ as a bifunctional catalyst for porosity and graphitization. The catalyst prepared at 750 °C (referred to as MSAC-750) showed a large specific surface area (1670.3 m² g^-1), graphite structure, and high pyridine-N and Fe-N _<i>X</i> contents. Through the electrochemical workstation test, MSAC-750 shows excellent oxygen reduction reaction (ORR) activity, with an onset potential of 0.172 V and a half-wave potential of -0.028 V (<i>vs.</i> Ag/AgCl) in a neutral medium, and the ORR electron transfer number is 3.89. When applied to the MFCs as cathodic catalyRSC advancesFe/N codoped porous graphitic carbon derived from macadamia shells as an efficient cathode oxygen reduction catalyst in microbial fuel cells.PMC95898232021-K-112Li JZhang ZShi CHu JMa XNing HZhu HfalseFe/N codoped porous graphitic carbon derived from macadamia shells as an efficient cathode oxygen reduction catalyst in microbial fuel cells.In this study, Fe/N codoped porous graphitic carbon derived from macadamia shells was prepared at different temperatures as cathodic catalysts for microbial fuel cells (MFCs), with K₂FeO₄ as a bifunctional catalyst for porosity and graphitization. The catalyst prepared at 750 °C (referred to as MSAC-750) showed a large specific surface area (1670.3 m² g^-1), graphite structure, and high pyridine-N and Fe-N _<i>X</i> contents. Through the electrochemical workstation test, MSAC-750 shows excellent oxygen reduction reaction (ORR) activity, with an onset potential of 0.172 V and a half-wave potential of -0.028 V (<i>vs.</i> Ag/AgCl) in a neutral medium, and the ORR electron transfer number is 3.89. When applied to the MFCs as cathodic cataly2022-01-01T00:00:00Z2022 Oct2026-05-28T03:31:08.718Z2025-04-19T11:43:58.438ZS-EPMC95898233632993410.1039/d2ra04214b