熔盐
阳极
电解
材料科学
电化学
阴极
共晶体系
电解质
甲烷
化学工程
电极
冶金
化学
合金
有机化学
物理化学
工程类
作者
Wenlong Bai,Yu Zhang,Jian Nong Wang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2023-10-10
卷期号:11 (42): 15364-15372
标识
DOI:10.1021/acssuschemeng.3c04205
摘要
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 Li1.427Na0.359K0.214CO3 ∼ 0.15LiOH at 650 °C. This work could provide a feasible and efficient strategy toward the development of integrated CO2 capture and utilization techniques..
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