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首页> 外文期刊>Environmental Science & Technology >Oxygen-Reducing Biocathodes Operating with Passive Oxygen Transfer in Microbial Fuel Cells
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Oxygen-Reducing Biocathodes Operating with Passive Oxygen Transfer in Microbial Fuel Cells

机译：微生物燃料电池中采用被动氧​​气转移的降氧生物阴极

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摘要

Oxygen-reducing biocathodes previously developed for microbial fuel cells (MFCs) have required energy-intensive aeration of the catholyte. To avoid the need for aeration, the ability of biocathodes to function with passive oxygen transfer was examined here using air cathode MFCs. Two-chamber, air cathode MFCs with biocathodes produced a maximum power density of SS4 ± 0 mW/m~2, which was comparable to that obtained with a Pt cathode (576 ± 16 mW/m~2), and 38 times higher than that produced without a catalyst (14 ± 3 mW/m~2). The maximum current density with biocathodes in this air-cathode MFC was 1.0 A/m~2, compared to 0.49 A/ m~2 originally produced in a two-chamber MFC with an aqueous cathode (with cathode chamber aeration). Single-chamber, air-cathode MFCs with the same biocathodes initially produced higher voltages than those with Pt cathodes, but after several cycles the catalytic activity of the biocathodes was lost This change in cathode performance resulted from direct exposure of the cathodes to solutions containing high concentrations of organic matter in the single-chamber configuration. Biocathode performance was not impaired in two-chamber designs where the cathode was kept separated from the anode solution. These results demonstrate that direct-air biocathodes can work very well, but only under conditions that minimize heterotrophic growth of microorganisms on the cathodes.
机译：先前为微生物燃料电池（MFCs）开发的减少氧气的生物阴极需要对阴极电解液进行能量密集的曝气。为了避免曝气，在这里使用空气阴极MFCs检查了生物阴极通过被动氧转移起作用的能力。带有生物阴极的两室空气阴极MFC的最大功率密度为SS4±0 mW / m〜2，与Pt阴极的最大功率密度（576±16 mW / m〜2）相当，是38倍。在没有催化剂的情况下产生的（14±3 mW / m〜2）。与最初在带有含水阴极（带阴极室曝气）的两室MFC中产生的0.49 A / m〜2相比，此空气阴极MFC中使用生物阴极的最大电流密度为1.0 A / m〜2。具有相同生物阴极的单室空气阴极MFC最初产生的电压高于具有Pt阴极的空气阴极，但经过数次循环后，生物阴极的催化活性丧失了。阴极性能的这种变化是由于阴极直接暴露于含高浓度阴极的溶液而导致的。单室配置中有机物的浓度。在两室设计中，阴极与阳极溶液保持隔离状态，不会损害生物阴极的性能。这些结果表明，直接空气生物阴极​​可以很好地工作，但是仅在使微生物在阴极上异养生长最小的条件下才能起作用。

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  • 来源
    《Environmental Science & Technology》 |2013年第4期|2085-2091|共7页
  • 作者

    Xue Xia; Justin C. Tokash; Fang Zhang; Peng Liang; Xia Huang; Bruce E. Logan;

  • 作者单位

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

    Department of Civil and Environmental Engineering, Penn State University, 231Q Sackett Building, University Park, Pennsylvania 16802, United States;

    Department of Civil and Environmental Engineering, Penn State University, 231Q Sackett Building, University Park, Pennsylvania 16802, United States;

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

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

    State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, P.R. China,Department of Civil and Environmental Engineering, Penn State University, 231Q Sackett Building, 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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