Increased power generation in a continuous flow MFC with advective flow through the porous anode and reduced electrode spacing
Increased power generation in a continuous flow MFC with advective flow through the porous anode and reduced electrode spacing
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DOI：
10.1021/es051652w
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发表时间：
2006-04-01
影响因子：
11.4
通讯作者：
Logan, BE
中科院分区：
文献类型：
--
作者：
Cheng, S;Liu, H;Logan, BE
在单室空气阴极微生物燃料电池（MFC）中产生的最大功率先前已被证明当电极之间的间距从4 cm减小到2 cm时会增加。然而，当电极间距从2 cm减小到1 cm时（分批模式操作，功率由阴极投影面积归一化），来自具有葡萄糖（500 mg/L）的MFC的最大功率从811 mW/m（2）（R-ex = 200 Ω，CE的库仑效率= 28%）减小到423 mW/m（2）（雷克斯= 500 Ω，CE = 18%）。功率的下降是出乎意料的，因为内部电阻从35 Ω（2厘米间距）下降到16 Ω（1厘米间距）。然而，提供通过多孔阳极朝向阴极的平流大大增加了功率，导致在使用葡萄糖或生活废水作为底物的空气-阴极系统中实现的最高最大功率密度。对于葡萄糖，在电极间距为1 cm且通过阳极的流动与MFC的连续流动操作的情况下，最大功率增加到1540 mW/m（2）（51 W/m（3））且CE增加到60%。使用生活废水（255 +/- 10 mg COD/L），最大功率密度为464 mW/m（2）（15.5 W/m（3）; CE = 27%）。虽然流过阳极可能导致堵塞，特别是对于颗粒基质如生活废水，但使用葡萄糖操作该系统超过42天而没有堵塞。这些结果表明，如果反应器以连续流动模式运行，平流通过阳极流向阴极，则可以通过减小电极间距来增加这种空气阴极单室MFC的功率输出。
The maximum power generated in a single-chamber air-cathode microbial fuel cell (MFC) has previously been shown to increase when the spacing between the electrodes is decreased from 4 to 2 cm. However, the maximum power from a MFC with glucose (500 mg/L) decreased from 811 mW/ m(2) (R-ex = 200 Omega, Coulombic efficiency of CE = 28%) to 423 mW/m(2) (Rex = 500 Omega, CE = 18%) when the electrode spacing was decreased from 2 to 1 cm (batch mode operation, power normalized by cathode projected area). This decrease in power was unexpected as the internal resistance decreased from 35 Omega (2-cm spacing) to 16 Omega (1-cm spacing). However, providing advective flow through the porous anode toward the cathode substantially increased power, resulting in the highest maximum power densities yet achieved in an air-cathode system using glucose or domestic wastewater as substrates. For glucose, with a 1-cm electrode spacing and flow through the anode with continuous flow operation of the MFC, the maximum power increased to 1540 mW/m(2) (51 W/m(3)) and the CE increased to 60%. Using domestic wastewater (255 +/- 10 mg of COD/L), the maximum power density was 464 mW/m(2) (15.5 W/m(3); CE = 27%). Although flow through the anode could lead to plugging, especially for particulate substrates such as domestic wastewater, the system was operated using glucose for over 42 days without clogging. These results show that power output in this air-cathode single-chamber MFC can be increased by reducing the electrode spacing if the reactors are operated in continuous flow mode with advective flow through the anode toward the cathode.