Set potential regulation reveals additional oxidation peaks of Geobacter sulfurreducens anodic biofilms
Set potential regulation reveals additional oxidation peaks of Geobacter sulfurreducens anodic biofilms
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DOI：
10.1016/j.elecom.2012.06.013
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发表时间：
2012-08
影响因子：
5.4
通讯作者：
Xiuping Zhu;M. Yates;B. Logan
中科院分区：
文献类型：
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作者：
Xiuping Zhu;M. Yates;B. Logan
在微生物燃料电池和其他生物电化学系统中产生的更高的电流密度与各种锗物种的存在有关。许多电子传递成分参与胞外电子传递的模型exoelectrogen，Gesterylsulfurreducens。先前已经表明，在循环伏安法扫描中可以识别5个主要氧化峰。它在这里示出，7个独立的氧化峰出现在相对较长的时间段内，当一个较大的范围内的设定电位被用来驯化电活性生物膜。用G.在0.60V（vs. Ag/AgCl）下驯化的硫还原菌生物膜与在-0.46V下形成的生物膜不同，并且它们的峰都与在-0.30V、0 V和0.30V下孵育的生物膜获得的峰不同。这些结果扩展了G.硫还原菌产生可识别的氧化峰，其对于细胞外电子转移可能是重要的。
Higher current densities produced in microbial fuel cells and other bioelectrochemical systems are associated with the presence of various Geobacter species. A number of electron transfer components are involved in extracellular electron transfer by the model exoelectrogen, Geobacter sulfurreducens. It has previously been shown that 5 main oxidation peaks can be identified in cyclic voltammetry scans. It is shown here that 7 separate oxidation peaks emerged over relatively long periods of time when a larger range of set potentials was used to acclimate electroactive biofilms. The potentials of oxidation peaks obtained with G. sulfurreducens biofilms acclimated at 0.60V (vs. Ag/AgCl) were different from those that developed at −0.46V, and both of their peaks were different from those obtained for biofilms incubated at −0.30V, 0V, and 0.30V. These results expand the known range of potentials for which G. sulfurreducens produces identifiable oxidation peaks that could be important for extracellular electron transfer.