The Effect of Specific Adsorption of Cations and Their Size on the 
Charge-Compensation Mechanism in Carbon Micropores: The Role of Anion Desorption

Levi, M. D.; Sigalov, S.; Salitra, G.; Aurbach, D.; Maier, J.

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The Effect of Specific Adsorption of Cations and Their Size on the Charge-Compensation Mechanism in Carbon Micropores: The Role of Anion Desorption

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Maier, J.
Department Physical Chemistry of Solids (Joachim Maier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Levi, M. D., Sigalov, S., Salitra, G., Aurbach, D., & Maier, J. (2011). The Effect of Specific Adsorption of Cations and Their Size on the Charge-Compensation Mechanism in Carbon Micropores: The Role of Anion Desorption. ChemPhysChem, 12(4), 854-862.

Cite as: https://hdl.handle.net/21.11116/0000-000E-BF6D-2

Abstract

Combined application of cyclic voltammetry (CV) and electro-chemical quartz crystal microbalance (EQCM) technique reveals a complicated interplay between the adsorption of ammonium and lower molecular weight tetraalkyl ammonium cations and desorption of Cl(-) anions inside carbon micropores at low surface charge densities, which results in failure of their permselectivity. Higher negative surface charge densities induce complete exclusion (desorption) of the Cl(-) co-ions, which imparts purely permselective behavior on the carbon micropores. The second fundamental effect discovered herein relates to the dominant role of anion desorption (as compared to cation adsorption), that is, overwhelming failure of permselectivity extends to high negative charge densities of the electrode in the presence of bulky tetraalkyl ammonium cations, which tend to be confined in the micropores of the carbon. The results obtained are important for advancement of high power density carbon-based supercapacitors, nanofiltration technologies with porous carbon membranes, and studies of ionic transport across biological membranes.