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首页> 外文期刊>Environmental Science & Technology >Negative Faradaic Resistance in Extracellular Electron Transfer by Anode-Respiring Geobacter sulfurreducens Cells
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Negative Faradaic Resistance in Extracellular Electron Transfer by Anode-Respiring Geobacter sulfurreducens Cells

机译：阳极呼吸的Geobacter sulfreducens细胞在细胞外电子转移中的负法拉第电阻。

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摘要

Geobacter sulfurreducens is a Gram-negative δ-proteobacterium that is capable of transferring respiratory electrons to solid-state extracellular acceptors, including anodes, via abundant c-type cytochromes expressed in the outer membrane. As extracellular electron transfer (EET) to solid-state acceptors can proceed without the addition of exogenous mediators, this microbe has attracted significant attention with respect to energy conversion between electrical and chemical energy. Here, we revealed that clear redox peaks were present in the whole-cell cyclic voltammogram of G. sulfurreducens at around -0.15 V vs Ag|AgCl when tin-doped In_2O_3 (ITO) glass was used as an anode. Interestingly, the EET current decreased in the potential region more positive than the midpoint potential (E_m) of the redox peak. Thus, EET of anode-respiring G. sulfurreducens cells exhibited a negative Faradaic resistance (NFR) characteristic at the E_m of the redox peak, in contrast to general electrochemical systems where the Faradaic current typically increases with increasing overpotential.
机译：减少还原性土壤细菌是革兰氏阴性δ变形杆菌，它能够通过外膜中表达的大量c型细胞色素将呼吸电子转移到固态细胞外受体，包括阳极。由于可以在不添加外源介体的情况下进行向固态受体的细胞外电子转移（EET），因此该微生物在电能与化学能之间的能量转换方面引起了极大的关注。在此，我们发现，当使用掺杂锡的In_2O_3（ITO）玻璃作为阳极时，在-0.15 V相对于Ag | AgCl的情况下，硫还原菌的全细胞循环伏安图中存在清晰的氧化还原峰。有趣的是，在比氧化还原峰的中点电势（E_m）更正的电势区域中，EET电流下降。因此，与一般的电化学系统相反，其中法拉第电流随超电势的增加而增加的常规电化学系统相反，与阳极呼吸有关的硫还原性贾第酵母细胞的EET在氧化还原峰的E_m处呈现负法拉第电阻（NFR）特性。

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  • 来源
    《Environmental Science & Technology》 |2011年第23期|p.10163-10169|共7页
  • 作者

    Shoichi Matsuda; Huan Liu; Souichiro Kato; Kazuhito Hashimoto; Shuji Nakanishi;

  • 作者单位

    Department of Applied Chemistiy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8156, Japan, ERATO/JST, Hashimoto Light Energy Conversion Project, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904;

    Department of Applied Chemistiy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8156, Japan, ERATO/JST, Hashimoto Light Energy Conversion Project, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904;

    Department of Applied Chemistiy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8156, Japan, ERATO/JST, Hashimoto Light Energy Conversion Project, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904;

    Department of Applied Chemistiy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8156, Japan, ERATO/JST, Hashimoto Light Energy Conversion Project, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904;

    Department of Applied Chemistiy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8156, Japan, ERATO/JST, Hashimoto Light Energy Conversion Project, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904;

  • 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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