2008/06/01 by Svyatoslav Kondrat, S. Kondrat, Alexei A. Kornyshev +2 · 3 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · Social Sciences · #Conducting polymers and applications #E-Government and Public Services #Electrochemical Analysis and Applications #Smart Cities and Technologies #Supercapacitor Materials and Fabrication #cond-mat.soft
paper · pdf · doi:10.1088/0953-8984/23/2/022201
published as J. Phys.: Condens. Matter 23 022201 (2010)
openalex publication_date 2008/06/01 · arxiv created 2010/10/05 · arxiv updated 2015/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/02
In recent experiments (Chmiola et al 2006 Science 313 1760; Largeot et al 2008 J. Am. Chem. Soc. 130 2730) an anomalous increase of the capacitance with a decrease of the pore size of a carbon-based porous electric double-layer capacitor has been observed. We explain this effect by image forces which exponentially screen out the electrostatic interactions of ions in the interior of a pore. Packing of ions of the same sign becomes easier and is mainly limited by steric interactions. We call this state 'superionic' and suggest a simple model to describe it. The model reveals the possibility of a voltage-induced first order transition between a cation(anion)-deficient phase and a cation(anion)-rich phase which manifests itself in a jump of capacitance as a function of voltage.