Kižys Kasparas, Pirštelis Domas, Morkvėnaitė-Vilkončienė Inga
Department of Nanotechnology, State Research Institute Center for Physical Sciences and Technology, 02300 Vilnius, Lithuania.
Biosensors (Basel). 2024 Nov 26;14(12):572. doi: 10.3390/bios14120572.
Microbial fuel cells (MFCs) are a candidate for green energy sources due to microbes' ability to generate charge in their metabolic processes. The main problem in MFCs is slow charge transfer between microorganisms and electrodes. Several methods to improve charge transfer have been used until now: modification of microorganisms by conductive polymers, use of lipophilic mediators, and conductive nanomaterials. We created an MFC with a graphite anode, covering it with 9,10-phenatrenequinone and polypyrrole-modified with and without 10 nm sphere gold nanoparticles. The MFC was evaluated using cyclic voltammetry and power density measurements. The peak current from cyclic voltammetry measurements increased from 3.76 mA/cm to 5.01 mA/cm with bare and polypyrrole-modified yeast, respectively. The MFC with polypyrrole- and nanoparticle-modified yeast reached a maximum power density of 150 mW/m in PBS with 20 mM Fe(III) and 20 mM glucose, using a load of 10 kΩ. The same MFC with the same load in wastewater reached 179.2 mW/m. These results suggest that this MFC configuration can be used to improve charge transfer.
微生物燃料电池（MFCs）因其微生物在代谢过程中产生电荷的能力而成为绿色能源的候选者。MFCs的主要问题是微生物与电极之间的电荷转移缓慢。到目前为止，已经使用了几种改善电荷转移的方法：用导电聚合物对微生物进行修饰、使用亲脂性介质以及导电纳米材料。我们创建了一个带有石墨阳极的MFC，用9,10-菲醌和有无10纳米球形金纳米颗粒修饰的聚吡咯覆盖它。使用循环伏安法和功率密度测量对该MFC进行了评估。循环伏安法测量的峰值电流分别从3.76 mA/cm增加到裸酵母和聚吡咯修饰酵母的5.01 mA/cm。在含有20 mM Fe(III)和20 mM葡萄糖的PBS中，使用10 kΩ的负载，带有聚吡咯和纳米颗粒修饰酵母的MFC达到了150 mW/m的最大功率密度。在废水中使用相同负载的相同MFC达到了179.2 mW/m。这些结果表明，这种MFC配置可用于改善电荷转移。
