氮掺杂多孔碳材料阳极制备及其在微生物燃料电池上的应用

Preparation of nitrogen-doped porous carbon anode and its application in microbial fuel cells

微生物燃料电池(MFCs)作为一种可以替代传统能源的生物电化学系统引起研究者的极大兴趣,其阳极材料的构造是目前的研究热点.本文从改善阳极材料表面物理化学性质的角度出发,用吐司作为多孔碳前驱体,三聚氰胺为氮源,直接烧制氮掺杂三维碳材料,并与不添加氮源的阳极材料和未改性的商用碳布进行比较.制备的掺氮NB1000阳极具有较大的比表面积(216.664 m^(2)·g^(-1))和优良的电导率.利用Geobacter和Shewanella混合菌落在微生物燃料电池(MFCs)中进行培养和性能评价,NB1000阳极的微生物燃料电池最大面功率密度为3049.714 mW·m^(-2),电流密度为7.4464 A·m^(-2),分别是普通碳布阳极的6.54倍和1.54倍.结果表明,NB1000作阳极的MFCs具有较高的功率密度,主要归因于阳极中引入氮掺杂,促进了产电微生物胞外电子传递过程所需的外膜c型细胞色素OmcA和MtrC的分泌.

Microbial fuel cells(MFCs),as a bioelectrochemical system that can replace traditional energy sources,have attracted great interest of researchers,and the construction of anode materials is the current research focus.In order to improve the physical and chemical properties of the surface of the anode material,the nitrogen-doped three-dimensional carbon material was directly sintered by using toast as the porous carbon precursor and melamine as the nitrogen source,and compared with the anode material without adding nitrogen source and the unmodified commercial carbon cloth.The nitrogen-doped NB1000 anode has a large specific surface area(216.664 m^(2)·g^(-1))and excellent conductivity.A mixed Geobacter and Shewanella colony was used to culture and evaluate the performance of MFCs,and the maximum areal power density and current density of the microbial fuel cell with NB1000 anode were 3049.714 mW·m^(-2) and 7.4464 A·m^(-2).It is 6.54 times and 1.54 times that of ordinary carbon cloth anode,respectively.The results showed that the high power 2022 density of MFCs from NB1000 anode was due to the introduction of nitrogen into the anode,which promoted the secretion of c-type cytochromes OmcA and MtrC in the outer membrane,which were required for the extracellular electron transport process of electrogenic microorganisms.