Adjustable bidirectional extracellular electron transfer between Comamonas testosteroni biofilms and electrode via distinct electron mediators |
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| Institution: | 1. School of Civil and Environmental Engineering, Nanyang Technological University, Singapore;2. Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological University, Singapore;3. School of Biological Science, Nanyang Technological University, Singapore;4. Singapore Centre on Environmental Life Sciences Engineering, Nanyang Technological University, Singapore;1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China;3. Guangdong Institute of Eco-environmental and Soil Sciences, Guangdong Key Laboratory of Agricultural Environment Management, Guangzhou, 510640, China;4. College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China;1. College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China;2. Department of Environmental Engineering, Technical University of Denmark, DK, 2800, Lyngby, Denmark |
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| Abstract: | Bidirectional extracellular electron transfer of strain Comamonas testosteroni I2 was for the first time investigated with electrochemical active biofilms developed under different conditions. The electrochemical active biofilm developed under microbial fuel cell conditions was capable of anodic electron transfer via attached redox species with standard potential of 0.04 V (vs. SCE). Meanwhile the above redox species lost its catalytic capability when the biofilm was developed under a constant potential (? 0.4 V vs. SCE). Instead, the microbe adjusted its electron transfer strategy to a soluble shuttle (standard potential ? 0.20 V vs. SCE) and enabled a cathodic current. Air exposure experiment verified that the soluble shuttle at negative potential had a positive response to the oxygen; meanwhile the anodic electron transfer via the attached species was rarely influenced. |
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