中文摘要：

采用生物电化学系统还原二氧化碳合成有机物近年来已成为环境微生物学的研究热点。本研究构建了具有电活性微生物的生物电化学系统，混合菌群通过电极直接传递或电极电子转化为氢气两种方式获得电子，同时产生甲烷和乙酸。在设定阴极电势为-1 100 mV时，甲烷生成速率为17.3 mL h-1 L-1，乙酸生成速率为13.9 mg h-1 L-1，总库伦效率可达94.0%。生物阴极群落构成包括醋酸杆菌属（Acetobacterium）、甲烷杆菌属（Methanobacterium）和甲烷微粒菌属（Methanocorpusculum）等功能微生物。研究表明生物电化学系统中，基于混合菌构建的生物阴极可以将二氧化碳还原为多种有机物，并且其中微生物的电子获得方式也存在多样性。图 4 参 35

英文摘要：

Reduction of CO2 to organics with bioelectrical systems has become a research area of environmental microbiology. This study constructed a bioelectrochemical system （BES） capable of reducing CO2 to CH4 and CH3COOH via abiotical H2 gas production and/or direct extracellular electron transfer. CH4 and CH3COOH were produced at rates of 17.3 mL h-1 L-1 and 13.9 mg h-1 L-1, respectively （at potential of -1 100 mV）. The current capture efficiency reached 94.0% in batch potentiostatic experiments. Microbial characterization revealed that the microbial populations consisted of Methanobacterium palustre, Methanocorpusculum parvum, and acetogen Acetobacterium sp. These results suggested that mixed culture in BESs can convert CO2 into various organic compounds by accepting electrons in different ways. Fig 4, Ref 33