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Characterization of Microbial Fuel Cells at Microbially and Electrochemically Meaningful Time scales

机译：微生物燃料电池在微生物和电化学有意义的时间尺度上的表征

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摘要

The variable biocatalyst density in a microbial fuel cell (MFC) anode biofilm is a unique feature of MFCs relative to other electrochemical systems, yet performance characterizations of MFCs typically involve analyses at electrochemically relevant time scales that are insufficient to account for these variable biocatalyst effects. This study investigated the electrochemical performance and the development of anode biofilm architecture under different external loadings, with duplicate acetate-fed single-chamber MFCs stabilized at each resistance for microbially relevant time scales. Power density curves from these steady-state reactors generally showed comparable profiles despite the fact that anode biofilm architectures and communities varied considerably, showing that steady-state biofilm differences had little influence on electrochemical performance until the steady-state external loading was much larger than the reactor internal resistance. Filamentous bacteria were dominant on the anodes under high external resistances (1000 and 5000 Ω), while more diverse rod-shaped cells formed dense biofilms under lower resistances (10,50, and 265 Ω). Anode charge transfer resistance decreased with decreasing fixed external resistances, but was consistently 2 orders of magnitude higher than the resistance at the cathode. Cell counting showed an inverse exponential correlation between cell numbers and external resistances. This direct link of MFC anode biofilm evolution with external resistance and electricity production offers several operational strategies for system optimization.
机译：相对于其他电化学系统，微生物燃料电池（MFC）阳极生物膜中可变的生物催化剂密度是MFC的独特功能，然而MFC的性能表征通常涉及在电化学相关的时间尺度上进行的分析，不足以解决这些可变的生物催化剂效应。这项研究调查了在不同外部负载下的电化学性能和阳极生物膜结构的发展，在微生物相关的时间范围内，在每个电阻上稳定的重复乙酸酯喂养的单室MFC。来自这些稳态反应器的功率密度曲线通常显示出可比的曲线，尽管阳极生物膜的结构和群落变化很大，这表明稳态生物膜的差异对电化学性能的影响很小，直到稳态外部负载远大于电化学负载。电抗器内部电阻。在高外部电阻（1000和5000Ω）下，丝状细菌在阳极上占主导地位，而在较低电阻（10,50和265Ω）下，更多种的杆状细胞形成致密的生物膜。阳极电荷转移电阻随着固定外部电阻的降低而降低，但始终比阴极电阻高2个数量级。细胞计数显示细胞数与外部电阻之间呈反指数关系。 MFC阳极生物膜进化与外部电阻和电力产生的直接联系为系统优化提供了几种操作策略。

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  • 来源
    《Environmental Science & Technology》 |2011年第6期|p.2435-2441|共7页
  • 作者

    Zhiyong Ren; Hengjing Yan; Wei Wang; Matthew M. Mench; John M. Regan;

  • 作者单位

    Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States,Department of Civil Engineering, University of Colorado Denver, Denver, Colorado 80204, United States;

    Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States;

    Department of Civil Engineering, University of Colorado Denver, Denver, Colorado 80204, United States;

    Department of Mechanical, Aerospace, and Biomedical Engineering, University of Tennessee, Knoxville, Tennessee 37996, United States;

    Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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