The CO2 Conversion by an Electroactive Clostridium strain Induced by Electrochemical Reducing Equivalent

Title
The CO2 Conversion by an Electroactive Clostridium strain Induced by Electrochemical Reducing Equivalent
Authors
최옥경나수민김연제우한민엄영순
Keywords
bioelectrochemical system; biocathode; CO2 reduction
Issue Date
2013-04
Publisher
한국화학공학회 2013년도 봄 총회 및 학술대회
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/44820
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KIST Publication > Conference Paper
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