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首页> 外文期刊>Environmental Science & Technology >Whole Cell Electrochemistry of Electricity-Producing Microorganisms Evidence an Adaptation for Optimal Exocellular Electron Transport
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Whole Cell Electrochemistry of Electricity-Producing Microorganisms Evidence an Adaptation for Optimal Exocellular Electron Transport

机译：产电微生物的全细胞电化学证明最佳的胞外电子运输的适应

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The mechanism(s) by which electricity-producing microorganisms interact with an electrode is poorly understood. Outer membrane cytochromes and conductive pili are being considered as possible players, but the available information does not concur to a consensus mechanism yet. In this work we demonstrate that Geobacter sulfurreducens cells are able to change the way in which they exchange electrons with an electrode as a response to changes in the applied electrode potential. After several hours of polarization at 0.1 VAg/AgCI-KCI (saturated), the voltammetric signature of the attached cells showed a single redox pair with a formal redox potential of about -0.08 V as calculated from chronopotentiometric analysis. A similar signal was obtained from cells adapted to 0.4 V. However, new redox couples were detected after conditioning at 0.6 V. A large oxidation process beyond 0.5 V transferring a higher current than that obtained at 0.1 V was found to be associated with two reduction waves at 0.23 and 0.50 V. The apparent equilibrium potential of these new processes was estimated to be at about 0.48 V from programmed current potentiometric results. Importantly, when polarization was lowered again to 0.1 V for 18 additional hours, the signals obtained at 0.6 V were found to greatly diminish in amplitude, whereas those previously found at the lower conditioning potential were recovered. Results clearly show the reversibility of cell adaptation to the electrode potential and point to the polarization potential as a key variable to optimize energy production from an electricity producing population.
机译：产电微生物与电极相互作用的机制了解甚少。外膜细胞色素和导电菌毛被认为是可能的参与者，但可用信息尚不认同共识机制。在这项工作中，我们证明了土细菌还原硫细胞能够改变它们与电极交换电子的方式，以响应所施加的电极电位的变化。在0.1 VAg / AgCI-KCI（饱和）下极化几个小时后，依计时电位分析计算，附着细胞的伏安特征显示出一对氧化还原对，其形式氧化还原电势约为-0.08V。从适应0.4 V的电池中获得了相似的信号。但是，在0.6 V调节后，发现了新的氧化还原对。超过0.5 V的大氧化过程转移了比0.1 V更高的电流，这与两次还原有关这些新工艺的表观平衡电位从编程的电流电位结果估计约为0.48V。重要的是，当极化再次降低到0.1 V并持续18个小时时，发现在0.6 V时获得的信号幅度大大减小，而以前在较低的调节电势下发现的信号却被恢复了。结果清楚地表明，细胞对电极电位的适应性是可逆的，并且指出极化电位是优化发电人群产生能量的关键变量。

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