School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China.
School of Environment and Energy, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, Guangdong, 510006, PR China; SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou, 510006, China; School of Environment, South China Normal University, University Town, Guangzhou, 510006, China.
Biosens Bioelectron. 2023 Jan 15;220:114895. doi: 10.1016/j.bios.2022.114895. Epub 2022 Nov 7.
Anode performance has been regarded as a crucial factor determining long-term stability and electricity generation of microbial fuel cells (MFCs), which restricts by the difficult extracellular electron transfer (EET) on the microbe/anode interface. Herein, inspired by biological enzyme systems, this study synthesized the biomimetic nanozymes with Fe-N-S-C active sites as the anode materials of MFCs, which was similar to the hemes of c-type cytochromes (c-Cyts) for boosting EET process. As excepted, an obviously faster start-up and a much higher power density were achieved by the MFCs equipped with Fe-N-S-C nanozymes (startup time, 3.5 d; power density, 2366 ± 34 mW m) than that based on traditional carbon cloth (startup time, 5.6 d; power density, 1009 ± 26 mW m). Such unique features of Fe-N-S-C nanozymes anode not only greatly favored the bacterial adhesion and the electroactive bacteria enrichment on the anode surface, but also efficiently facilitated the EET process between the electroactive bacteria and anode surface. This study provided a feasible strategy for designing the novel MFC anode materials from the perspective of bionic enzyme.
阳极性能被认为是决定微生物燃料电池（MFC）长期稳定性和发电能力的关键因素，而这受到微生物/阳极界面上电子外转移（EET）困难的限制。受生物酶系统的启发，本研究合成了具有 Fe-N-S-C 活性位点的仿生纳米酶作为 MFC 的阳极材料，类似于 c 型细胞色素（c-Cyts）中的血红素，以促进 EET 过程。不出所料，与基于传统碳纤维布（启动时间为 5.6 d；功率密度为 1009 ± 26 mW m）的 MFC 相比，配备 Fe-N-S-C 纳米酶的 MFC 实现了明显更快的启动和更高的功率密度（启动时间为 3.5 d；功率密度为 2366 ± 34 mW m）。Fe-N-S-C 纳米酶阳极的这种独特特性不仅极大地有利于细菌在阳极表面的附着和电活性细菌的富集，而且还有效地促进了电活性细菌和阳极表面之间的 EET 过程。本研究从仿生酶的角度为设计新型 MFC 阳极材料提供了一种可行的策略。
