聚吡咯基改性碳刷电极在微生物燃料电池中的应用研究

Application of polypyrrole modified carbon brush electrode in microbial fuel cells

针对微生物燃料电池输出功率低的问题,以碳纤维刷为改性对象,采用原位化学聚合的方法在碳纤维表面生长聚吡咯薄膜,增强电极的生物相容性,有利于产电微生物在电极表面的附着和繁殖;进一步在碳纤维表面引入石墨烯,可提高电极的比表面积和导电性能。结果表明,在聚吡咯和石墨烯的协同作用下,微生物燃料电池的产电性能得到极大提升,最大输出电压和最大输出功率密度分别能达到0.62 V和900 m W/m^(2),与未改性碳刷相比分别提高了近24%和133%。

Carbon fiber brush is taken as the modification object to improve its power generation performance to solve the low output power problem of microbial fuel cells.Polypyrrole film grows on the surface of carbon fiber by employing in-situ chemical polymerization method,which enhances significantly the biocompatibility of the electrode,and it is conducive to the attachment and reproduction of electricity producing microorganisms on the electrode surface.Furthermore,the addition of graphene on the surface of carbon fiber improves the specific surface area and conductivity of the electrode.Under the synergistic effect of polypyrrole and graphene,the power generation performance of microbial fuel cells is greatly improved.The maximum output voltage and maximum output power density can reach 0.62 V and 900 m W·m^(-2),respectively,which are nearly 24%and 133%higher than that of unmodified carbon brush.