Fuel cell reactors or electrolyzers based on alkaline anion-exchange membrane and proton exchange membrane (AAEM & PEM) are investigated for gas phase electrochemical conversion of humidified CO₂ under identical conditions, using conventional Pt/C, Pd/C and Cu/CNTs as cathodic catalysts. Humidified CO₂ can be converted to H₂ and CO via the AAEM based fuel cell reactors with an estimated onset potential of −1.0 V using Cu/CNT as cathodic catalyst, while PEM based fuel cell reactors can only produce H₂ under identical conditions. This can be attributed to the suppressed hydrogen evolution and enhanced CO₂ reduction in the case of AAEM based reactor. Remarkably, AAEM based reactor with Cu/CNT cathode catalysts shows a higher activity (8.88 μmol h⁻¹ cm⁻²) to convert CO₂ to CO than that of Pd/C (7.59 μmol h⁻¹ cm⁻²) and Pt/C (0.75 μmol h⁻¹ cm⁻²) at the same catalyst loading. This study indicates that AAEM based reactor is able to realize the gas phase electrochemical conversion of CO₂, providing a viable strategy for CO₂ utilization and conversion to useful fuels.

研究了基于碱性阴离子交换膜和质子交换膜（AAEM＆PEM）的燃料电池反应器或电解器，在相同条件下使用传统的Pt / C，Pd / C和Cu / CNTs在相同条件下进行湿式CO _2的气相电化学转化。阴极催化剂。使用Cu / CNT作为阴极催化剂，加湿的CO ₂可以通过基于AAEM的燃料电池反应器转化为H ₂和CO，估计的起始电势为-1.0 V，而基于PEM的燃料电池反应器只能在相同条件下生产H ₂。这可以归因于氢气的抑制和CO _2的增强减少基于AAEM的反应器。值得注意的是，具有Cu / CNT阴极催化剂的AAEM基反应器显示出比Pd / C（7.59μmolh ^-1  cm ^-2）和Pt / C更高的活性（8.88μmolh ^-1  cm ^-2）将CO ₂转化为CO。在相同催化剂负载下的C（0.75μmolh ^-1  cm ^-2）。该研究表明，基于AAEM的反应器能够实现CO ₂的气相电化学转化，为CO _2的利用和转化为有用的燃料提供了可行的策略。