CO2 Conversion to Formate by an Electroactive Clostridium strain Induced by Electrochemical Reducing Equivalent
- CO2 Conversion to Formate by an Electroactive Clostridium strain Induced by Electrochemical Reducing Equivalent
- 최옥경; 우한민; 엄영순
- CO2 fixation; bioelectrochemical synthesis; Clostridium strain; formate
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- The CO2 reduction using electrical current mimics photosynthesis in plants and it has been issued for renewable energy production. More specifically, several microbes have been used as a catalyst of electrochemical CO2 reduction. However, only autotrophic bacteria like acetogen and methanogen have been studied for CO2 reduction. Here we show that the electroactive Clostridium reduced CO2 to formate under bioelectrochemical system (BES) without any mediators. The bioelectrochemical conversion was performed in the cathode compartment poised at -160 mV vs. Ag/AgCl. The biocathode was prepared with biofilm of electroactive Clostridium strain by repeating several batch fermentations with 20 g/L glucose under BES. After biofilm formation, cathode compartment was purging with pure CO2 (99.9%) or the isotope 13CO2 to track bioelectrochemical conversion. In BES with 13CO2, 13C-formate was detected in GC/MS, whereas none in control (without electricity). Based on the results, electrons introduced as reducing equivalents were likely to induce the conversion of CO2 to formate by electroactive Clostridium strain which is able to accept electrons from cathodes directly.
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