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首页> 外文期刊>Environmental Science & Technology >Transient Storage of Electrical Charge in Biofilms of Shewanella oneidensis MR-1 Growing in a Microbial Fuel Cell
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Transient Storage of Electrical Charge in Biofilms of Shewanella oneidensis MR-1 Growing in a Microbial Fuel Cell

机译：在微生物燃料电池中生长的沙瓦氏假单胞菌MR-1生物膜中电荷的瞬时存储

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摘要

Current output of microbial fuel cells (MFCs) depends on a number of engineering variables mainly related to the design of the fuel cell reactor and the materials used. In most cases the engineering of MFCs relies on the premise that for a constant biomass, current output correlates well with the metabolic activity of the cells. In this study we analyze to what extent, MFC output is also affected by the mode of operation, emphasizing how discontinuous operation can affect temporal patterns of current output. The experimental work has been carried out with Shewanella oneidensis MR-1, grown in conventional two-chamber MFCs subject to periodic interruptions of the external circuit. Our results indicate that after closure of the external circuit, current intensity shows a peak that decays back to basal values. The result suggests that the MFC has the ability to store charge during open circuit situations. Further studies using chronoamperometric analyses were carried out using isolated biofilms of Shewanella oneidensis MR-1 developed in a MFC and placed in an electrochemistry chamber in the presence of an electron donor. The results of these studies indicate that the amount of excess current over the basal level released by the biofilm after periods of circuit disconnection is proportional to the duration of the disconnection period up to a maximum of approximately 60 min. The results indicate that biofilms ofShewanella oneidensis MR-1 have the ability to store charge when oxidizing organic substrates in the absence of an external acceptor.
机译：微生物燃料电池（MFCs）的电流输出取决于许多工程变量，这些变量主要与燃料电池反应堆的设计和所用材料有关。在大多数情况下，MFCs的工程设计都基于这样一个前提：对于恒定的生物量，电流输出与细胞的代谢活性密切相关。在这项研究中，我们分析了MFC输出在何种程度上也受操作模式的影响，强调了不连续操作如何影响电流输出的时间模式。实验工作是用Shewanella oneidensis MR-1进行的，该MR-1在常规的两室MFC中生长，受到外部电路的周期性中断。我们的结果表明，在关闭外部电路后，电流强度显示出一个峰值，该峰值会衰减回基值。结果表明，MFC具有在断路情况下存储电荷的能力。使用计时电流分析法进行的进一步研究是使用在MFC中显影并放置在有电子供体存在的电化学室内的分离的Shewanella oneidensis MR-1生物膜进行的。这些研究的结果表明，在电路断开一段时间后，超过生物膜释放的基础水平的过大电流量与断开时间的长短成正比，最长约60分钟。结果表明，在没有外部受体的情况下，氧化希瓦氏菌MR-1的生物膜具有氧化电荷的能力。

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  • 来源
    《Environmental Science & Technology》 |2011年第23期|p.10250-10256|共7页
  • 作者

    Naroa Uria; Xavier Munoz Berbel; Olga Sanchez; Francesc Xavier Munoz; Jordi Mas;

  • 作者单位

    Group of Environmental Microbiology, Universitat Autonoma de Barcelona, Bellaterra, Spain;

    Centra Nacional de Microelectronica (CNM-IMB) CSIC, Spain;

    Group of Environmental Microbiology, Universitat Autonoma de Barcelona, Bellaterra, Spain;

    Centra Nacional de Microelectronica (CNM-IMB) CSIC, Spain;

    Group of Environmental Microbiology, Universitat Autonoma de Barcelona, Bellaterra, Spain;

  • 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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