本发明属于生物电化学领域，具体涉及一种利用石墨烯‑泡沫铜复合阴极提高生物还原CO2电合成乙酸的方法。所述方法包括：1)微生物培养；2)构建双室H型电解池，其中阴极采用石墨烯‑泡沫铜复合阴极，将微生物菌接种至双室H型电解池的阴极室中进行培养，阴极电势为‑990mV vs SHE，阳极室持续通入N2‑CO2(80:20)气体，阴极室最初持续通入N2‑CO2‑H2(83:10:7)气体，运行5～6天后，再持续通入N2‑CO2(80:20)气体，继续运行10天；收集菌液，测定乙酸含量。本发明提供了一种以石墨烯‑泡沫铜复合材料为阴极的MES合成乙酸的方法，该方法具有较高产乙酸速率。
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