在电化学熔盐系统中连续高效捕获和还原 CO2,ACS Sustainable Chemistry & Engineering

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在电化学熔盐系统中连续高效捕获和还原 CO2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-10-10 , DOI: 10.1021/acssuschemeng.3c04205
Wan Li Bai ₁ , Yu Zhang ₁ , Jian Nong Wang ₁

Affiliation

将二氧化碳（CO ₂）电化学还原为高价值燃料已被认为是缓解全球变暖问题的一种有前途且经济的方法。然而，以有效的方式实现CO ₂的同时捕获和转化仍然是一个挑战，这对于高碳排放工厂的直接应用至关重要。在此，我们展示了一种具有分区电解室的熔盐电解槽的新颖设计，该电解槽可以连续捕获CO ₂并将其转化为CH ₄，转化效率为100%。基于该电解槽为提高CH ₄产量进行了系统研究，包括电解质Li-Na-K三元共晶碳酸盐的组成调整、阳极和阴极电催化剂的选择以及电化学参数的优化（即电流密度、温度和CO ₂流速）。在熔融的 Li _1.427 Na _0.359中，使用商业白铜 (CuNi _{18 ) 片作为阴极和耐腐蚀镍 (Ni) 片作为阳极，在 400 mA·cm}^–2下获得了最高的甲烷选择性 (33.26%)。K _0.214 CO ₃ ∼ 0.15LiOH，650 °C。这项工作可以为开发集成的CO ₂捕获和利用技术提供可行且有效的策略。

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Continuous Capture and Reduction of CO2 in an Electrochemical Molten-Salt System with High Efficiency

Electrochemical reduction of carbon dioxide (CO₂) into high-value fuels has been considered as a promising and economic method to mitigate the global warming issue. However, it is still a challenge to realize the simultaneous capture and conversion of CO₂ in an efficient way, which is essential for direct applications in high-carbon-emission plants. Herein, we demonstrate the novel design of a molten-salt-based electrolyzer featured with partitioned electrolysis chambers, which can continuously capture and convert CO₂ into CH₄ with 100% conversion efficiency. Systematic studies are conducted based on this electrolyzer to boost the CH₄ production, including the composition tuning of Li–Na–K ternary eutectic carbonates as the electrolyte, the choice of anode and cathode electrocatalysts, and the optimization of electrochemical parameters (i.e., the current density, temperature, and CO₂ flow rate). The highest selectivity of methane (33.26%) is obtained at 400 mA·cm^–2 using a commercial cupronickel (CuNi₁₈) sheet as the cathode and a corrosion-resistant nickel (Ni) sheet as the anode in the molten Li_1.427Na_0.359K_0.214CO₃ ∼ 0.15LiOH at 650 °C. This work could provide a feasible and efficient strategy toward the development of integrated CO₂ capture and utilization techniques..

更新日期：2023-10-10

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