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在分离器耦合微生物燃料电池中优化空气阴极结构。

Air-cathode structure optimization in separator-coupled microbial fuel cells.

机构信息

State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.

出版信息

Biosens Bioelectron. 2011 Dec 15;30(1):267-71. doi: 10.1016/j.bios.2011.09.023. Epub 2011 Sep 24.

Abstract

Microbial fuel cells (MFC) with 30% wet-proofed air cathodes have previously been optimized to have 4 diffusion layers (DLs) in order to limit oxygen transfer into the anode chamber and optimize performance. Newer MFC designs that allow close electrode spacing have a separator that can also reduce oxygen transfer into the anode chamber, and there are many types of carbon wet-proofed materials available. Additional analysis of conditions that optimize performance is therefore needed for separator-coupled MFCs in terms of the number of DLs and the percent of wet proofing used for the cathode. The number of DLs on a 50% wet-proofed carbon cloth cathode significantly affected MFC performance, with the maximum power density decreasing from 1427 to 855 mW/m(2) for 1-4 DLs. A commonly used cathode (30% wet-proofed, 4 DLs) produced a maximum power density (988 mW/m(2)) that was 31% less than that produced by the 50% wet-proofed cathode (1 DL). It was shown that the cathode performance with different materials and numbers of DLs was directly related to conditions that increased oxygen transfer. The coulombic efficiency (CE) was more affected by the current density than the oxygen transfer coefficient for the cathode. MFCs with the 50% wet-proofed cathode (2 DLs) had a CE of >84% (6.8 A/m(2)), which was substantially larger than that previously obtained using carbon cloth air-cathodes lacking separators. These results demonstrate that MFCs constructed with separators should have the minimum number of DLs that prevent water leakage and maximize oxygen transfer to the cathode.

摘要

带有 30%湿防空气阴极的微生物燃料电池 (MFC) 之前已经经过优化,采用 4 个扩散层 (DL),以限制氧气向阳极室转移并优化性能。允许电极间距较小的新型 MFC 设计具有分离器,也可以减少氧气向阳极室转移,并且有许多类型的碳湿防材料可供选择。因此,对于带有分离器的 MFC,需要根据阴极的 DL 数量和湿防比例进一步分析优化性能的条件。50%湿防碳布阴极上的 DL 数量对 MFC 性能有显著影响,1-4 DL 的最大功率密度从 1427 降至 855 mW/m(2)。常用的阴极(30%湿防,4 DL)的最大功率密度(988 mW/m(2))比 50%湿防阴极(1 DL)低 31%。结果表明,具有不同材料和 DL 数量的阴极性能与增加氧气转移的条件直接相关。与氧气转移系数相比,电流密度对库仑效率 (CE) 的影响更大。具有 50%湿防阴极(2 DL)的 MFC 的 CE 大于 84%(6.8 A/m(2)),这明显大于之前使用缺乏分离器的碳布空气阴极获得的值。这些结果表明,带有分离器的 MFC 应采用最小数量的 DL,以防止漏水并最大程度地将氧气转移到阴极。

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