H_(2)mediated mixed culture microbial electrosynthesis for high titer acetate production from CO_(2)  

作　　者：Yanhong Bian Aaron Leininger Harold D.May Zhiyong Jason Ren 

机构地区：[1]Department of Civil and Environmental Engineering,Princeton University,86 Olden St,Princeton,NJ,08544,United States [2]Andlinger Center for Energy and the Environment,Princeton University,86 Olden St.,Princeton,NJ,08544,United States

出　　处：《Environmental Science and Ecotechnology》2024年第3期125-131,共7页环境科学与生态技术（英文）

基　　金：supported by the Department of Energy Bioenergy Technologies Office under the award DE-EE0008932;supported through the Princeton Center for Complex Materials(PCCM),a National Science Foundation(NSF)-MRSEC program(DMR-2011750).

摘　　要：Microbial electrosynthesis(MES)converts CO_(2)into value-added products such as volatile fatty acids(VFAs)with minimal energy use,but low production titer has limited scale-up and commercialization.Mediated electron transfer via H_(2)on the MES cathode has shown a higher conversion rate than the direct biofilm-based approach,as it is tunable via cathode potential control and accelerates electrosynthesis from CO_(2).Here we report high acetate titers can be achieved via improved in situ H_(2)supply by nickel foam decorated carbon felt cathode in mixed community MES systems.Acetate concentration of 12.5 g L^(-1)was observed in 14 days with nickel-carbon cathode at a poised potential of-0.89 V(vs.standard hydrogen electrode,SHE),which was much higher than cathodes using stainless steel(5.2 g L^(-1))or carbon felt alone(1.7 g L^(-1))with the same projected surface area.A higher acetate concentration of 16.0 g L^(-1)in the cathode was achieved over long-term operation for 32 days,but crossover was observed in batch operation,as additional acetate(5.8 g L^(-1))was also found in the abiotic anode chamber.We observed the low Faradaic efficiencies in acetate production,attributed to partial H_(2)utilization for electrosynthesis.The selective acetate production with high titer demonstrated in this study shows the H_(2)-mediated electron transfer with common cathode materials carries good promise in MES development.

关 键 词：Microbial electrosynthesis Indirect electron transfer CO_(2)electrolysis VFAs production 

分 类 号：O64[理学—物理化学]