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Molecular thermodynamic understanding of transport behavior of CO 2 at the ionic liquids‐electrode interface
Author(s) -
Wang Yanlei,
Qian Cheng,
Huo Feng,
Xu Baohua,
He Hongyan,
Zhang Suojiang
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17060
Subject(s) - ionic liquid , electrode , chemistry , ionic bonding , molecular dynamics , chemical physics , molecule , diffusion , entropy (arrow of time) , thermodynamics , ion , computational chemistry , organic chemistry , physics , catalysis
The transport behavior of CO 2 at the ionic liquids (ILs)‐electrode interface was revealed from the thermodynamic view via molecular dynamics simulations. The hopping and self‐diffusive mechanisms were identified in the interfacial and bulk region, and thereafter a hopping‐diffusion model was developed to evaluate the transport resistance of CO 2 from bulk to the interface. Meanwhile, the vibrational spectrum and entropy change of CO 2 at the interface were calculated using the thermodynamic analysis method. For ILs with the same cation ([Emim] + ), both transport resistance and entropy decrease follow the order: [BF 4 ] − < [AC] − < [NO 3 ] − , indicating [BF 4 ] − possesses the faster CO 2 transport efficiency across the electrical double layer. Furthermore, the methyl substitution effect on transport and thermodynamic properties was clarified, indicating the coupling relation between the transport process and thermodynamic advantage. These findings can lay the ground for the molecule design of ILs‐electrode interface in the applications in the chemical engineering field.