Nanoionics of advanced superionic conductors

Abstract

Abstract. New scientific direction -nanoionics of advanced superionic conductors (ASICs) was proposed. Nanosystems of solid state ionics were divided onto two classes differing by an opposite influence of crystal structure defects on the ionic conductivity oi (energy activation E): 1) nanosystems on the base compounds with initial small o~ (large values of E); and II) nanosystems of ASICs (nano-ASICs) with E = 0.1 eV.The fundamental challenge of nanoionics as the conservation of fast ion transport (FIT) in nano-ASICs on the level of bulk crystal was first recognized and for the providing of FIT in nanoASICs the conception of structure-ordered (coherent) ASIC//indifferent electrode (IE) heteroboundaries was proposed. Nano-ASIC characteristic parameter P = d/Xo (d is the thickness of ASIC layer with the defect crystal structure at the heteroboundary, and Ao is the screening length of charge for mobile ions of the bulk of ASIC) was introduced. The criterion for a conservation of FIT in nano-ASIC is P = 1. It was shown that at the equilibrium conditions the contact potentials V at the ASIC//IE coherent heterojunctions in nano-ASICs are V << keT/e. Interface engineering approach "from advanced materials to advanced devices" was proposed as fundamentals for the development of applied nanoionics. The possibility for creation on the base of ASIC//IE coherent heterojunctions of the efficient energy and power devices (sensors and supercapacitors with specific capacity ~10 -~ F/cm 2 and maximal frequencies 10~-109 Hz,) suited for micro(nano)electronics, microsystem technology and 5 Gbit DRAM was pointed out.

Optical and electrical properties of Cu6PS5I-based thin films versus copper content variation

“…Further studies of the Cu 6 PS 5 I-based thin films are still very interesting because these films can be used for producing miniature solid electrolytes and supercapacitors [13]. Below we report the results for electrical conductivity, Raman scattering and optical absorption of the Cu 6 PS 5 Ibased thin films deposited using a technique of magnetron sputtering.…”

Effect of Mg doping and sintering temperature on structural and morphological properties of samarium-doped ceria for IT-SOFC electrolyte

“…Nanostructured materials are widely used in many different applications in SOFCs because of their unique physical and chemical properties, different from bulk materials. The nanostructured solid-state ionic electrolyte termed ''nanoionics'' has become interest of research in advanced energy conversion and storage applications (Despotuli et al 2005;Maier 2005;Despotuli and Andreeva 2010). The Yttria-stabilized Zirconia (YSZ) was used as electrolyte in solid oxide fuel cell (SOFC), and drawbacks such as high operating temperature in using YSZ as electrolyte can be eliminated by replacing it with cerium materials.…”

Electrical and optical parameters of Cu6PS5I-based thin films deposited using magnetron sputtering

“…It should be noted that the thin films based on superionic conductors can be applied to the production of supercapacitors of new generation [9]. In comparison to the traditional type of capacitors, they are characterized by small dimensions and high capacitances.…”