Impact of Ion-Ion Correlated Motion on Salt Transport in Solvated Ion Exchange Membranes

被引：18

作者：

Marioni, Nico ^{[1
]}

Zhang, Zidan ^{[1
]}

Zofchak, Everett S. ^{[1
]}

Sachar, Harnoor S. ^{[1
]}

Kadulkar, Sanket ^{[1
]}

Freeman, Benny D. ^{[1
]}

Ganesan, Venkat ^{[1
]}

机构：

[1] Univ Texas Austin, McKetta Dept Chem Engn, Austin, TX 78712 USA

来源：

ACS MACRO LETTERS | 2022年 / 11卷 / 11期

关键词：

IRREVERSIBLE-PROCESSES; DIFFUSION-COEFFICIENTS; MASS-TRANSPORT; ELECTROLYTES; LIQUIDS;

D O I：

10.1021/acsmacrolett.2c00361

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The influence of dynamical ion-ion correlations and ion pairing on salt transport in ion exchange membranes remain poorly understood. In this study, we use the framework of Onsager transport coefficients within atomistic molecular dynamics simulations to study the impact of ion-ion correlated motion on salt transport in hydrated polystyrene sulfonate membranes and compare with the results from aqueous salt solutions. At sufficiently high salt concentrations, cation-anion dynamical correlations exert a significant influence on both salt diffusivities and conductivities. Anion-anion distinct correlations, arising from the imbalance between the concentration of free (mobile) cations and anions, and the retarding effect of the fixed charge groups on cations, proves to be an additional important feature for polymer membranes. Our results demonstrate that dynamical correlations should become an important consideration in experimental measurements of salt diffusivities and conductivities for non-dilute salt solutions in polymer membranes.

引用

页码：1258 / 1264

页数：7

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