Additivity of ionic currents in mixed electrolyte solutions and confined geometries

被引:4
作者
Perez-Grau, Jose J. [1 ]
Cervera, Javier [2 ]
Nasir, Saima [3 ,4 ]
Ali, Mubarak [3 ,4 ]
Ensinger, Wolfgang [3 ]
Ramirez, Patricio [1 ]
Mafe, Salvador [2 ]
机构
[1] Univ Politecn Valencia, Dept Fis Aplicada, E-46022 Valencia, Spain
[2] Univ Valencia, Dept Fis Terra & Termodinam, E-46100 Burjassot, Spain
[3] Tech Univ Darmstadt, Dept Mat & Geosci, Mat Anal, Alarich Weiss Str 02, D-64287 Darmstadt, Germany
[4] GSI Helmholtzzentrum Schwerionenforsch, Mat Res Dept, Planckstr 1, D-64291 Darmstadt, Germany
关键词
Conical nanopore; Mixed electrolytes; Lithium ion; Calcium ion; Current additivity; EXCHANGE MEMBRANES; CHARGE INVERSION; NANOPORES; RECTIFICATION; SELECTIVITY; TRANSPORT; MIXTURES;
D O I
10.1016/j.molliq.2022.119592
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrolyte mixtures in aqueous solutions are central to biophysical chemistry and chemical engineering. In many cases, ions are confined to nanoscale volumes with surface electrical charges. Here, we analyze experimentally the additivity of ionic currents across negatively charged conical nanopores in mixed electrolyte solutions. These pores show an asymmetric axial distribution of carboxylic acid groups on the pore surface, which gives rectified current (I)-voltage (V) curves when a single-pore membrane is bathed by two symmetrical aqueous solutions at neutral pH values. We consider KCl, LiCl, NaCl, CsCl, CaCl2, and K2SO4 pure electrolytes as well as the mixed electrolyte systems LiCl + KCl, NaCl + KCl, CsCl + KCl, CaCl2 + KCl, and K2SO4 + KCl for concentrations ranging from 2 to 500 mM and applied voltages between -2 V and 2 V. The difference between the sum of the pure electrolyte currents and the mixed electrolyte current is studied in terms of the electrolyte concentration, the sign of the applied voltage in the current-voltage curves, and the mixed electrolyte type. (C) 2022 Elsevier B.V. All rights reserved.
引用
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页数:10
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