The CO2 Conversion by an Electroactive Clostridium strain Induced by Electrochemical Reducing Equivalent
- The CO2 Conversion by an Electroactive Clostridium strain Induced by Electrochemical Reducing Equivalent
- 최옥경; 나수민; 김연제; 우한민; 엄영순
- bioelectrochemical system; biocathode; CO2 reduction
- Issue Date
- 한국화학공학회 2013년도 봄 총회 및 학술대회
- In this study, we reports a Clostridium strain revealing a distinct reduction peak in cyclic voltammogram when three electrodes with grassy carbon electrode (working electrode), platinum electrode (counter electrode), and Ag/AgCl reference electrode were immersed into the culture of the Clostridium strain. This electroactive behavior of the strain supports the direct electron transfer from a cathode to the strain. From further analysis, we also found increasing NADH/NAD+ ratio, an intracellular factor representing a reducing power for the fermentation. The CO2 reduction was tested using the electroactive strain poised at -160 mV vs. Ag/AgCl under CO2 gas. The current consumption was shown starting purging and the products were analyzed. To verify the product of CO2 reduction by biocathode, 13CO2 was purged and the product including 13C was tracked using gas chromatography/mass spectrometry (GC/MS). The 13C-methanol was detected and it showed CO2 reduction to methanol by the biocathode with direct electron transfer.
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