Effect of electrode spacing on the performance of microbial fuel cells with a honeycomb flow straightener

微生物燃料电池 电极 阳极 材料科学 内阻 功率密度 限制电流 电流密度 蜂巢 复合材料 分析化学(期刊) 化学 电化学 电池(电) 功率(物理) 色谱法 物理化学 物理 量子力学
作者
Chin‐Tsan Wang,I‐Ting Li,Jer‐Huan Jang
出处
期刊:International Journal of Energy Research [Wiley]
卷期号:44 (14): 12136-12144 被引量:5
标识
DOI:10.1002/er.5776
摘要

Microbial fuel cells (MFCs) are bioelectrochemical transducers that can be used to produce electrical power under the activity of microbes during the wastewater treatment processes. In the present study, the electrode spacing was considered as a parameter to investigate the influence on the performance of MFCs. The electrode spacing was defined as the distance of the anode electrode plate to the polymer exchange membrane in the MFCs. Three values were set at 0.0, 3.0, and 6.0 cm, respectively. In addition, a flow device, like a honeycomb type flow straightener, was introduced and implemented in the anode chamber for creating a uniform flow. The inner diameter of the honeycomb was 0.7 cm. Results showed that a higher limiting current density with 4108.7 mA/m2 and a lower resistance with 2.51 Ω can be found in the case of the 0.0 cm electrode spacing. These results also indicated that the shorter electrode spacing with flow straightener devices would improve the performance of MFCs, leading to lower internal resistance and higher power density. In addition, the scanning electron microscopy was employed to analyze the biofilm thickness for MFCs with different electrode spacing. It was also found that the biofilm thickness with 0 cm electrode spacing was larger than the other two cases, leading to a lower internal resistance in the MFCs.
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