Microbial fuel cell using anaerobic respiration as an anodic reaction and biomineralized manganese as a cathodic reactant

被引:192
作者
Rhoads, A
Beyenal, H
Lewandowski, Z
机构
[1] Montana State Univ, Ctr Biofilm Engn, Bozeman, MT 59717 USA
[2] Montana State Univ, Dept Civil Engn, Bozeman, MT 59717 USA
关键词
D O I
10.1021/es048386r
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We have operated a microbial fuel cell in which glucose was oxidized by Klebsiella pneumoniae in the anodic compartment, and biomineralized manganese oxides, deposited by Leptothrix discophora, were electrochemically reduced in the cathodic compartment. In the anodic compartment,to facilitate the electron transfer from glucose to the graphite electrode, we added a redox mediator, 2-hydroxy-1,4-naphthoquinone. We did not add any redox mediator to the cathodic compartment because the biomineralized manganese oxides were deposited on the surface of a graphite electrode and were reduced directly by electrons from the electrode. We have demonstrated that biomineralized manganese oxides are superior to oxygen when used as cathodic reactants in microbial fuel cells. The current density delivered by using biomineralized manganese oxides as the cathodic reactant was almost 2 orders of magnitude higher than that delivered using oxygen. Several fuel cells were operated for 500 h, reaching anodic potentials of -441.5 +/- 31 mV(SCE) and cathodic potentials of +384.5 +/- 64 mV(SCE). When the electrodes were connected by a 50 Omega resistor, the fuel cell delivered the peak power density of 126.7 +/- 31.5 mW/m(2).
引用
收藏
页码:4666 / 4671
页数:6
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