Marvin Dorn , Lukas Franke , Paul Figiel , Sabine Kareth , Eckhard Weidner , Christoph Held , Marcus Petermann
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引用次数: 0
摘要
电化学二氧化碳还原反应(CO2RR)对于开发封闭式碳循环的重要性与日俱增。在这种情况下,通常使用电解质来增加导电性,从而提高电流密度。此外,使用压缩的 CO 和含电解质的有机溶剂可抑制氢的演化。然而,CO 饱和电解质溶液的电导率大多不为人知。因此,本研究对不同电解质浓度、压力(最高 150 巴)和温度(298.15 K 和 343.15 K)下的电导率进行了研究。此外,在 ePC-SAFT 的密度建模支持下,使用简化的平均球形近似(MSA-simple)模型成功地建立了电导率模型。结果表明,CO 饱和电解质溶液的电导率通常低于不含 CO 的电解质溶液。然而,在电解质和 CO 浓度很低的情况下,CO 饱和电解质溶液的电导率要高于无 CO 的电解质溶液,这在文献中是一个新发现。
Measurement and modeling of the electrical conductivity of organic electrolyte solutions and their mixtures with compressed CO2
The electrochemical carbon dioxide reduction reaction (CO2RR) is of increasing importance for the development of a closed carbon cycle. Here, electrolytes are often used to increase the electrical conductivity and thus the current density. In addition, the use of compressed CO2 and electrolyte-containing organic solvents suppresses hydrogen evolution. However, the electrical conductivity of CO2-saturated electrolyte solutions is mostly unknown. Therefore, their electrical conductivity was investigated in this work at different electrolyte concentrations, pressures (up to 150 bar) and temperatures (298.15 K and 343.15 K). In addition, the simplified Mean Spherical Approximation (MSA-simple) model, supported by ePC-SAFT for density modeling, was used to successfully model the conductivity. The results show that CO2-saturated electrolyte solutions generally exhibit lower conductivities than CO2-free electrolyte solutions. However, at very low electrolyte and CO2 concentrations, the conductivities were higher in CO2-saturated electrolyte solutions than in CO2-free electrolyte solutions, which is a new finding in the literature.
期刊介绍:
The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics.
Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.