Composite Oxide Electrolytes for Electrochemical Devices

Abstract

This work is focused on the comparative analysis of electrical, electrochemical and mechanical properties of composite ceramic oxide electrolytes, providing a brief overview of the materials having better performance than monophase ones in various high temperature electrochemical devices such as: solid oxide fuel cells, sensors for automotive industry, oxygen probes for controlling metal processing. Introduction of Al 2 O 3 inclusions into cubic yttria -zirconia solid solution (8YSZ) matrix, caused the improvement of electrical and mechanical properties compared to pure 8YSZ. The Nd 2 Ti 2 O 7 secondary phase was also able to coexist with 8YSZ matrix and the fracture toughness K Ic of 8YSZ ceramics was also significantly improved by Nd 2 Ti 2 O 7 addition.Heterophase oxide ionic conductors in the system Calcium zirconate -cubic calcia zirconia solid electrolytes seem to be promising solid electrolytes for application in electrochemical probes for controlling oxygen dissolved in molten steel. The ionic conduction limit for electrolytes based on CaZrO 3 is lower than that for calcia -stabilized zirconia (13CSZ). Hence CaZrO 3 -based materials perform better at low oxygen concentration at molten alloys.On the other hand composite layered ceramics involving Ce 0.8 Sm 0.2 O 2 /Bi 0.8 Eb 0.2 O 2 or Ce 0.9 Gd 0.1 O 2 /BaCe 0.8 Y 0.2 O 3 /Ce 0.9 Gd 0.1 O 1.95 system exhibited better electrolytic stability in gas atmospheres with low oxygen partial pressure at the temperatures 600-800 o C. These materials are successfully tested as electrolytes in solid oxide fuel cells. The gradient ceramic oxide electrolytes seems to overcome the limitation of applying them as solid electrolytes in solid oxide fuel cells for long time performance.

Electrochemical and thermal characterization of doped ceria electrolyte with lanthanum and zirconium

“…Therefore, such restraints put interest and need to develop new promising electrolyte materials for low-temperature SOFC (LT-SOFC) e.g., salt oxide composites materials and nanocomposites for advanced fuel cell [16][17]. The well-known solid electrolyte materials; MO 2 (M= Zr, Ce) are still prominent candidates for SOFCs [18].…”

The explanation of electrical properties changes under NH3 and H2 containing atmospheres in risen temperatures of ceria- and zirconia-based solid electrolytes by means of electrochemical impedance spectroscopy

“…Its mechanical and chemical properties make it valuable as a prosthetic material for medicine or constructive material for industry. Moreover, high ionic electrical conductivity and temperature shock tolerance of the stabilised ZrO 2 make it suitable for application in oxygen sensors [26][27][28][29][30], solid oxide fuel cells [31][32][33][34], ceramic components and as catalyst or catalysts promoters in the synthesis of alcohols by hydrogenation of CO [35][36][37][38].…”

Synthesis of Metal Oxide-Based Nanocomposites and Multicomponent Compounds Using Layer-by-Layer Method and Prospects for Their Application

“…For example, metallic and metal-oxide nanoparticles incorporated in various matrixes are capable to increase the activities of many chemical reactions due to the high ratio of the surface atoms with free valences to the total number of atoms in the cluster or nanoparticle [5]. As a result, one can obtain an ideal platform for designing chemical sensors and catalysts [6][7][8]. It was found that transition to nanocomposites could also improve mechanical properties and promote stabilization of the basic material parameters [9].…”