Department of Civil and Environmental Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Chemosphere. 2012 Jan;86(4):415-9. doi: 10.1016/j.chemosphere.2011.09.012. Epub 2011 Oct 20.
As an effort to better utilize the microbial fuel cell (MFC) technology, we previously proposed an innovative MFC system named M2FC consisting of ferric-based MFC part and ferrous-based fuel cell (FC) part. In this reactor, ferric ion, the catholyte in the MFC part, was efficiently regenerated by the FC part with the generation of additional electricity. When both units were operated separately, the ferric-based MFC part produced approximately 1360 mW m(-2) of power density with FeCl(3) as catholyte and Fe-citrate as anolyte. The ferrous-based FC part with FeCl(3) as catholyte and Fe-EDTA as anolyte displayed the highest power density (1500 mW m(-2)), while that with ferricyanide as catholyte and Fe-noligand as anolyte had the lowest power density (380 mW m(-2)). The types of catholytes and chelating complexes as anolyte were found to play important roles in the reduction of ferric ions and oxidation of ferrous ion. Linear sweep voltammetry results supported that the cathode electrolytes were electrically active and these agreed well with the M2FC reactor performance. These results clearly showed that ligands played critical role in the efficiency and rate for recycling iron ion and thus the M2FC performance.
为了更好地利用微生物燃料电池（MFC）技术，我们之前提出了一种名为 M2FC 的创新 MFC 系统，它由基于铁的 MFC 部分和基于亚铁的燃料电池（FC）部分组成。在该反应器中，FC 部分有效地将 MFC 部分的阴极液中的铁离子再生，同时产生额外的电能。当两个单元分别运行时，基于铁的 MFC 部分使用 FeCl3作为阴极液和 Fe-柠檬酸盐作为阳极液，产生约 1360 mW m-2的功率密度。基于亚铁的 FC 部分使用 FeCl3作为阴极液和 Fe-EDTA 作为阳极液，显示出最高的功率密度（1500 mW m-2），而使用铁氰化物作为阴极液和 Fe-低聚配体作为阳极液的功率密度最低（380 mW m-2）。发现阴极液和螯合剂作为阳极液的类型在还原铁离子和氧化亚铁离子方面起着重要作用。线性扫描伏安法结果表明，阴极电解液具有电活性，这与 M2FC 反应器的性能非常吻合。这些结果清楚地表明，配体在回收铁离子的效率和速率方面起着关键作用，从而影响 M2FC 的性能。
