Transport of ions in a mixed Na+/K+ ion conducting glass - electrodiffusion profiles and electrochemical interphase formation. (10th February 2016)

• Record Type: Journal Article
• Authors: Martin, Johannes; Mehrwald, Sarah; Schäfer, Martin; Kramer, Thilo; Jooss, Christian; Weitzel, Karl-Michael
• Is Part Of: Electrochimica acta. Volume 191(2016)
• Page Start: 616
• Page End: 623
• Publication Date: 2016-02-10
• Subjects: Electrodiffusion -- Concentration profiles -- Diffusion coefficient -- Nernst-Planck-Poisson -- Interphase formation -- FIB-TEM; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.01.061
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Abstract: The competition of Na + ion versus K + ion transport in a mixed alkali borosilicate glass has been investigated by low energy bombardment induced ion transport employing Cs + ions as the foreign ion. Electrodiffusion causes the replacement of Na + and K + down to about 200 nm below the surface of the glass. Beyond this electrodiffusion front (in the direction of ion transport) K + ions accumulate to a density above the bulk concentration while Na + is further depleted towards the backside electrode. At the backside electrode only Na is electrodeposited since the electrical potential does not allow for K electrodeposition. A full simulation of the electrodiffusion profiles reveals the complete concentration dependence of the diffusion coefficients of the Na + and K + ions.