CO2 고부가화를 위한 로도박터 스페로이데스를 활용한 미생물 전기합성 최적화 연구
Optimization of Microbial Electrosynthesis Using Rhodobacter sphaeroides for CO2 Upcycling
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Emitted CO2 is an attractive material for microbial electrochemical CO2 reduction. Microbial electrochemical CO2reduction (i.e., microbial electrosynthesis, MES) using biocatalysts has advantages compared to conventional CO2 reduction usingelectrocatalysts. However, MES has several challenges, including electrode performance, biocatalysts, and reactor optimization. In thisstudy, an MES system was investigated for optimizing reactor types, counter electrode materials, and CO2-converting microorganismsto achieve effective CO2 upcycling. In autotrophic cultivation (supplementation of CO2 and H2), CO2 consumption of Rhodobactersphaeroides was observed to be four times higher than that with heterotrophic cultivation (supplementation of succinic acid). Thebacterial growth in an MES reactor with a single-chambered shape was two times higher than that with a double chamber (H-typeMES reactor). Moreover, a single-chambered MES reactor equipped with titanium mesh as the counter electrode (anode) showedmarkedly increased current density in the graphite felt as a working electrode (cathode) compared to that with a graphite felt counterelectrode (anode). These results demonstrate that the optimized conditions of a single chamber and titanium mesh for the counterelectrode have a positive effect on microbial electrochemical CO2 reduction.
Abstract
Emitted CO2 is an attractive material for microbial electrochemical CO2 reduction. Microbial electrochemical CO2reduction (i.e., microbial electrosynthesis, MES) using biocatalysts has advantages compared to conventional CO2 reduction usingelectrocatalysts. However, MES has several challenges, including electrode performance, biocatalysts, and reactor optimization. In thisstudy, an MES system was investigated for optimizing reactor types, counter electrode materials, and CO2-converting microorganismsto achieve effective CO2 upcycling. In autotrophic cultivation (supplementation of CO2 and H2), CO2 consumption of Rhodobactersphaeroides was observed to be four times higher than that with heterotrophic cultivation (supplementation of succinic acid). Thebacterial growth in an MES reactor with a single-chambered shape was two times higher than that with a double chamber (H-typeMES reactor). Moreover, a single-chambered MES reactor equipped with titanium mesh as the counter electrode (anode) showedmarkedly increased current density in the graphite felt as a working electrode (cathode) compared to that with a graphite felt counterelectrode (anode). These results demonstrate that the optimized conditions of a single chamber and titanium mesh for the counterelectrode have a positive effect on microbial electrochemical CO2 reduction.
참고문헌 (16)
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