Wang Xiaohai, Shi Zhuanzhuan, Wang Zhikai, Wu Xiaoshuai
Institute of Materials Science and Devices, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China.
Materials (Basel). 2024 Mar 26;17(7):1501. doi: 10.3390/ma17071501.
The microbial hybrid system modified by magnetic nanomaterials can enhance the interfacial electron transfer and energy conversion under the stimulation of a magnetic field. However, the bioelectrocatalytic performance of a hybrid system still needs to be improved, and the mechanism of magnetic field-induced bioelectrocatalytic enhancements is still unclear. In this work, γ-FeO magnetic nanoparticles were coated on a CN32 cell surface and followed by placing in an electromagnetic field. The results showed that the electromagnetic field can greatly boost the extracellular electron transfer, and the oxidation peak current of CN32@γ-FeO increased to 2.24 times under an electromagnetic field. The enhancement mechanism is mainly due to the fact that the surface modified microorganism provides an elevated contact area for the high microbial catalytic activity of the outer cell membrane's cytochrome, while the magnetic nanoparticles provide a networked interface between the cytoplasm and the outer membrane for boosting the fast multidimensional electron transport path in the magnetic field. This work sheds fresh scientific light on the rational design of magnetic-field-coupled electroactive microorganisms and the fundamentals of an optimal interfacial structure for a fast electron transfer process toward an efficient bioenergy conversion.
由磁性纳米材料改性的微生物混合系统在磁场刺激下可增强界面电子转移和能量转换。然而，混合系统的生物电催化性能仍有待提高，磁场诱导生物电催化增强的机制仍不明确。在这项工作中，将γ-FeO磁性纳米颗粒包覆在CN32细胞表面，然后置于电磁场中。结果表明，电磁场可极大地促进细胞外电子转移，在电磁场作用下，CN32@γ-FeO的氧化峰电流增加到2.24倍。增强机制主要是由于表面改性微生物为外细胞膜细胞色素的高微生物催化活性提供了更大的接触面积，而磁性纳米颗粒在细胞质和外膜之间提供了一个网络化界面，以促进磁场中快速的多维电子传输路径。这项工作为磁场耦合电活性微生物的合理设计以及实现高效生物能量转换的快速电子转移过程的最佳界面结构基础提供了新的科学见解。
