Kinetics of Space Charge Storage in Composites. (9th February 2018)

• Record Type: Journal Article
• Authors: Chen, Chia‐Chin; Navickas, Edvinas; Fleig, Jürgen; Maier, Joachim
• Is Part Of: Advanced functional materials. Volume 28:Number 15(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-02-09
• Subjects: chemical diffusion -- composites -- interfacial storage -- supercapacitors -- transport; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201705999
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Composites of ion and electron conducting phases allow for interfacial storage of a neutral component via space charge effects. The present contribution considers the rate of transport‐controlled incorporation and excorporation in such artificial mixed conductors. The upper limit of the relaxation time is determined by interfacial job‐sharing diffusion which is analyzed in greater detail. In general cases bulk phases assist by migration processes (dual phase transport). For more complex morphological situations, the considerations are complemented by numerical calculations. Thus the treatment also offers a pertinent approach with respect to the kinetics of solid state supercapacitors. Selected experimental results are included in the discussion. Abstract : Mass storage at contacts of ionic and electronic conductors enables decoupling of the roles of ions and electrons. A treatment of the kinetics is presented covering diffusion along and transport to the active interfaces. Finite element calculations help understand the situation in complex microstructures. The contribution thus also offers a pertinent account of the kinetics of solid‐state supercapacitors.