Tuning electrochemical properties by incorporating weakly complexing amines into DETA systems for efficient electrochemically mediated amine regeneration
发布时间：2026-07-08
点击次数：
- 发布时间：
- 2026-07-08
- 影响因子：
- 9.0
- DOI码：
- 10.1016/j.seppur.2026.138345
- 论文名称：
- Tuning electrochemical properties by incorporating weakly complexing amines into DETA systems for efficient electrochemically mediated amine regeneration
- 发表刊物：
- Separation and Purification Technology
- 关键字：
- Carbon dioxide capture, Electrochemically mediated amine regeneration (EMAR), Blended amine solvents, Electrochemical performance, Energy consumption
- 摘要：
- Electrochemically mediated amine regeneration (EMAR) has emerged as an energy-efficient, electricity-driven alternative to conventional thermal solvent regeneration for point source CO2 capture. However, the practical implementation of EMAR system remains constrained by solution-level challenges, including strong amine-metal coordination that inhibits CO2 release, limited copper redox reversibility, and mass transfer limitations, collectively elevating the energy consumption beyond theoretical values. To address these issues, this work designs blended amine systems specifically tailored for the electrochemical regeneration environment, rather than for thermal desorption. By blending monoethanol amine (MEA), aminomethyl propanol (AMP), or methyldiethanol amine (MDEA) with the baseline diethylenetriamine (DETA), we systematically regulate the aimie‑copper coordination strength and interfacial charge transfer kinetics to enhance electrochemical regeneration efficiency. Among all formulations, 75/25 DETA/MDEA blend exhibited the most favorable redox characteristics in cyclic voltammetry, the lowest charge transfer and diffusion resistances for electrochemical impedance spectroscopy, along with high conductivity and well-defined electrode surface morphologies. Furthermore, 75/25 DETA/MDEA blend demonstrated high Faradaic efficiency for both anodic and cathodic reactions (AFE = 99.11%, CFE = 92.57%) and achieved a low CO2 desorption energy of 40.06 kJ⋅mol 1 CO2, representing a 30% reduction compared to the pure DETA system. The incorporation of MDEA, as a weakcoordinating component, enhances charge transfer and mass transport without compromising CO2 capture capacity. The insights and experimental results presented in this study provide a valuable foundation for designing efficient blended amine systems for EMAR CO2 capture.
- 学科门类：
- 工学
- 文献类型：
- J
- 卷号：
- 399
- 页面范围：
- 138345
- ISSN号：
- 1383-5866
- 是否译文：
- 否
- 发表时间：
- 2026-05-04
- 收录刊物：
- EI、SCI