Direct synthesis of methane from CO2/H2O in an oxygen-ion conducting solid oxide electrolyser
Direct synthesis of methane from CO2/H2O in an oxygen-ion conducting solid oxide electrolyser
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DOI：
10.1039/c1ee01035b
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发表时间：
2011-06-01
影响因子：
32.5
通讯作者：
Irvine, John T. S.
中科院分区：
文献类型：
--
作者：
Xie, Kui;Zhang, Yaoqing;Irvine, John T. S.
由CO2/H2O生产的合成燃料是一种有吸引力的替代能源载体。在这里，我们展示了一种新的策略，电化学转化CO2/H2O成烃在一个单一的步骤中的氧离子传导固体氧化物电解槽。在以（La0.8Sr0.2）（0.95）MnO 3-delta/YSZ/La0.2Sr0.8TiO3+delta（阴极）为阳极的高效电解槽中，将CO2/H2O共电解与原位费托合成相结合，直接合成甲烷。我们证明了高的CO/H-2法拉第产率和较低的甲烷产率，这表明对转化效率的限制来自多相催化过程。电化学结果还表明，在低电压下，La0.2Sr0.8TiO3+delta阴极的电化学还原过程为主，而在高电压下，阴极的电化学共电解过程为主。
Synthetic fuels produced from CO2/H2O are an attractive alternative energy carrier. Here we demonstrate a novel strategy to electrochemically convert CO2/H2O into hydrocarbon in a single step in an oxygen-ion conducting solid oxide electrolyser. Methane was directly synthesized in an efficient electrolyser with configuration of (anode) (La0.8Sr0.2)(0.95)MnO3-delta/YSZ/La0.2Sr0.8TiO3+delta (cathode) by combining coelectrolysis of CO2/H2O and in situ Fischer-Tropsch-type synthesis. We demonstrate a high Faradaic yield of CO/H-2 and lower methane yield, which shows that the limit on conversion efficiency comes from the heterogeneous catalysis process. Electrochemical results also show that the electrochemical reduction of La0.2Sr0.8TiO3+delta cathode is the main process at low electrical voltages while the coelectrolysis is the main process at high voltages.