The slow kinetics of oxygen reduction reaction (ORR) and the formation of biofilm on cathode severely limited the performance of microbial fuel cells (MFCs). An efficient way to enhance the power-generation capacity and long-term stability of MFCs is to develop bifunctional catalyst by incorporating the efficient ORR catalysts with antibacterial ingredient. In this study, the Ag/Co-N-C nanosheets were designed and synthesized by decorating Ag nanoparticles (NPs) onto Co-N-C nanosheets, which were prepared from Zn/Co bimetallic metal-organic framework (ZIF-67/ZIF-8) precursor. The Zn/Co ratio, Ag doping amount and the calcination temperature of the precursor were systematically investigated. The optimum sample Ag/Co-N-C-30 revealed the excellent ORR performance with a half-wave potential of 0.80 V vs. RHE, which was slightly lower than that of Pt/C (0.82 V vs. RHE). The MFCs equipped with Ag/Co-N-C-30 cathode exhibited maximum power density of 548 ± 12.6 mW m⁻² and superior durability even after 1600 h operation. Besides, the selective antimicrobial ability of Ag/Co-N-C-30 was further explored and the aerobic bacteria in cathode biofilm was found to be obviously inhibited by Ag/Co-N-C-30. The results suggested the Ag/Co-N-C nanosheets can serve as a promising cathode catalyst for practical applications of MFCs.

氧气还原反应（ORR）的缓慢动力学和阴极上生物膜的形成严重限制了微生物燃料电池（MFCs）的性能。增强MFC发电能力和长期稳定性的有效方法是通过将高效的ORR催化剂与抗菌成分结合在一起来开发双功能催化剂。在这项研究中，通过将Ag纳米颗粒（NPs）装饰到由Zn / Co双金属金属有机骨架（ZIF-67 / ZIF-8）制备的Co-NC纳米片上，设计并合成了Ag / Co-NC纳米片。 。系统研究了Zn / Co比，Ag掺杂量和前驱体的煅烧温度。最佳样品Ag / Co-NC-30表现出出色的ORR性能，半波电势相对于RHE为0.80 V，略低于Pt / C（0.82 V vs. RHE）。配备有Ag / Co-NC-30阴极的MFC的最大功率密度为548±12.6 mW m^－2和即使在1600 h操作后仍具有出色的耐久性。此外，进一步探索了Ag / Co-NC-30的选择性抗菌能力，发现阴极生物膜中的好氧细菌明显受到Ag / Co-NC-30的抑制。结果表明，Ag / Co-NC纳米片可以作为MFCs实际应用中有希望的阴极催化剂。