The reduction of CO₂ to organics using microbial electrosynthesis (MES) is currently a popular research direction in the environmental field. In this study, we evaluated the effect of the electrode material on the production of organics from CO₂ in microbial electrosynthesis with a mixed-culture biocathode. The electrode material is an important factor influencing electron transfer, since it directly affects the efficiency of CO₂ reduction. In this study, we compared the performance of a graphite electrode and a metal-based carbon hybrid material electrode for the electro-reduction of CO_2. The cathode potential was set to −0.8 V (vs Ag/AgCl). When the cathode material was changed from a graphite electrode to a nano-titanium carburizing electrode, the current density of MES increased from 1.66 ± 0.2 A·m⁻² to 2.75 ± 0.2 A·m⁻², acetate accumulation increased from 127 mg/L to 234 mg/L, butyrate accumulation increased from 46 mg/L to 86.5 mg/L, and the total electron recovery of MES increased to nearly 70%. The results show that improving electrode performance can effectively improve the efficiency of MES for reducing CO₂. Metal-based carbon hybrid materials have good biological affinity and stability and also have good electrochemical performance.

利用微生物电合成（MES）将CO ₂还原为有机物是当前在环境领域中流行的研究方向。在这项研究中，我们评估了电极材料对混合培养生物阴极在微生物电合成中由CO ₂产生有机物的影响。电极材料是影响电子转移的重要因素，因为它直接影响CO ₂还原效率。在这项研究中，我们比较了石墨电极和金属基碳杂化材料电极在电还原CO _{2方面的性能。}阴极电位设定为-0.8V（vs Ag / AgCl）。当正极材料从石墨电极变为纳米钛渗碳电极时，MES的电流密度从1.66±0.2 A·m ^-2增加到2.75±0.2 A·m ^-2，乙酸盐累积量从127 mg /升至234 mg / L，丁酸积累从46 mg / L增加至86.5 mg / L，MES的总电子回收率提高至近70％。结果表明，提高电极性能可以有效提高MES降低CO ₂的效率。金属基碳杂化材料具有良好的生物亲和力和稳定性，并且还具有良好的电化学性能。