Thermophilic Moorella thermoautotrophica-immobilized cathode enhanced microbial electrosynthesis of acetate and formate from CO2

Bioelectrochemistry
Linpeng YuShungui Zhou

Abstract

Microbial electrosynthesis (MES) is a promising technique that converts electricity and CO2 to biofuels using microbes as the catalysts. However, most of previous MES are conducted at mesophilic temperatures and challenged by low performances. Here we report a significant electrosynthesis performance enhancement via immobilization of a thermophilic microbe to cathodes. A temperature-dependent electron uptake rate of Moorella thermoautotrophica was observed at a cathode potential of -0.4V (vs. SHE), with a maximum current density of 63.47mAm(-2) at 55°C. Moreover, electrosynthesis rates of formate and acetate at 55°C were accelerated by 23.2 and 2.8 fold than those of 25°C, respectively. Compared with natural biofilms, immobilization of M. thermoautotrophica with carbon nanoparticles to electrodes further enhanced acetate and formate production rates (by 14 and 7.9 fold), reaching 58.2 and 63.2mmolm(-2)day(-1) at a coulombic efficiency of 65%, respectively. To our best knowledge, these are the highest electrosynthesis rates obtained thus far for pure cultures under the conditions of -0.4V (vs. SHE) and 55°C. This study, for the first time, demonstrates that embedding microbes to electrodes by carbon nanoparticles is a facile and...Continue Reading

Citations

Nov 3, 2017·Biotechnology for Biofuels·Tian Zhang, Pier-Luc Tremblay
Mar 31, 2019·Journal of Industrial Microbiology & Biotechnology·Tahina Onina RanaivoarisoaArpita Bose
Mar 30, 2019·Journal of Industrial Microbiology & Biotechnology·Rengasamy KarthikeyanArpita Bose
Mar 9, 2019·Current Opinion in Biotechnology·Lin Su, Caroline M Ajo-Franklin
Dec 2, 2020·Bioresource Technology·Laura Rovira-AlsinaSebastià Puig

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