阳极传质对三合一微生物燃料电池性能的影响

Effect of Anodic Mass Transfer on Performance of Membrane Electrode Assembly Typed Microbial Fuel Cells

物质传输是影响MFC性能的一个重要因素。本文构建三合一膜电极式微生物燃料电池(MFC),研究了阳极传质形式对MFC启动特性、阳极生物膜电化学活性和性能的影响。结果表明,与阳极采用大腔室结构的MFC-1相比,阳极采用蛇形流道的MFC-2由于在启动过程中阳极电解液传质较佳,不但启动较快而且输出电压更高。启动完成后,MFC-2阳极生物膜电化学活性较高,采取不同扫描速度的循环伏安扫描测试证明了这主要是由于蛇形流道较佳的传质所致。启动过程和产电过程中较佳的传质导致MFC-2最大功率密度(2676.2 mW·m^(-2))比MFC-1最大功率密度(2149.0 mW·m^(-2))约高24.5%。

Mass transfer is one of important factors affecting the performance of Microbial Fuel Cell(MFC).Two membrane electrode assembly typed MFC with different mass transfer type in anode(MFC-1:bulk chamber in anode;MFC-2:serpentine flow field in anode) were constructed to investigate its effects on MFC performance.The results demonstrated that MFC-2 had a faster startup process and a higher voltage output due to the better mass transfer of anolyte during the startup period compared with MFC-1.After startup,the cyclic voltammetry tests were showed that MFC-2 biofilm had a higher electrochemical active behavior as the better mass transfer of serpentine flow filed.The above results lead to a 24.5% increase in maximal power density of MFC-2(2676.2mW-m-2) compared with MFC-1(2149.0 mW·m^(-2)).