Schlager Stefanie, Haberbauer Marianne, Fuchsbauer Anita, Hemmelmair Christine, Dumitru Liviu Mihai, Hinterberger Gabriele, Neugebauer Helmut, Sariciftci Niyazi Serdar
Linz Institute for Organic Solar Cells, Johannes Kepler University Linz, Altenbergerstraße 69, 4040, Linz, Austria.
acib GmbH, Linz, Austria.
ChemSusChem. 2017 Jan 10;10(1):226-233. doi: 10.1002/cssc.201600963. Epub 2016 Oct 28.
We present a study on a microbial electrolysis cell with methanogenic microorganisms adapted to reduce CO to CH with the direct injection of electrons and without the artificial addition of H or an additional carbon source except gaseous CO . This is a new approach in comparison to previous work in which both bicarbonate and gaseous CO served as the carbon source. The methanogens used are known to perform well in anaerobic reactors and metabolize H and CO to CH and water. This study shows the biofilm formation of those microorganisms on a carbon felt electrode and the long-term performance for CO reduction to CH using direct electrochemical reduction. CO reduction is performed simply by electron uptake with gaseous CO as the sole carbon source in a defined medium. This "electrometabolism" in such microbial electrolysis cells depends strongly on the potential applied as well as on the environmental conditions. We investigated the performance using different adaption mechanisms and a constant potential of -700 mV vs. Ag/AgCl for CH generation at 30-35 °C. The experiments were performed by using two-compartment electrochemical cells. Production rates with Faradaic efficiencies of around 22 % were observed.
我们展示了一项关于微生物电解池的研究，该电解池中的产甲烷微生物经过驯化，可在直接注入电子且不人工添加氢气或除气态一氧化碳之外的其他碳源的情况下，将一氧化碳还原为甲烷。与之前以碳酸氢盐和气态一氧化碳作为碳源的工作相比，这是一种新方法。所使用的产甲烷菌在厌氧反应器中表现良好，能将氢气和一氧化碳代谢为甲烷和水。本研究展示了这些微生物在碳毡电极上形成生物膜的情况，以及使用直接电化学还原法将一氧化碳还原为甲烷的长期性能。在特定培养基中，仅以气态一氧化碳作为唯一碳源，通过吸收电子即可实现一氧化碳的还原。这种微生物电解池中的“电代谢”在很大程度上取决于所施加的电位以及环境条件。我们在30 - 35°C下，使用不同的驯化机制和相对于Ag/AgCl为 - 700 mV的恒定电位来研究甲烷生成的性能。实验通过使用两室电化学池进行。观察到法拉第效率约为22%时的产率。
