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Solid oxide fuel cell electrolytes zirconia-based

The solid oxide fuel cell (SOFC) is based on a thin layer of solid ceramic electrolyte of yttria-stabilized zirconia operating at 600 to 1000°C, which transfers the oxygen ion (O ) from the cathode to the anode. The high temperature is necessary to achieve sufficient ionic conductivity [14]. The electrochemical reaction in an SOFC can be expressed as equation (1.16) to equation (1.18). [Pg.14]

The tape-casting method makes possible the fabrication of films in the region of several hundred micrometers thick. The mechanical strength allows the use of such a solid electrolyte as the structural element for devices such as the high-temperature solid oxide fuel cell in which zirconia-based solid electrolytes are employed both as electrolyte and as mechanical separator of the electrodes. [Pg.542]

Oxides exhibiting only high ion conductivity are mainly fluorite-related structures based on zirconia or ceria. Zirconia-based electrolytes are currently used in solid oxide fuel cells (SOFCs). The MIEC oxides are more attractive for separative membrane applications, and these oxides mainly belong to the following types fluorite-related oxides doped to improve their electron conduction, - ... [Pg.457]

Scandia-stabilized zirconia (ScSZ) possesses the highest oxygen-ion conductivity among all zirconia-based oxides, and therefore represents a promising solid electrolyte for applications in electrochemical devices such as solid oxide fuel cells (SO PCs) and catalytic membrane reactors (further details are available in Section 1.6.6.3). [Pg.35]

Watanabe M, Uchida H, Yoshida M (1997) Effect of ionic conductivity of zirconia electrolytes on the polarization behavior of ceria-based anodes in solid oxide fuel cells. J Electrochem Soc 144(5) 1739-11743... [Pg.656]

In 1965, the worldwide first 50 W solid oxide fuel cell based on yttrium-stabilized zirconia solid electrolyte was developed and tested in the Laboratory of Electrolytes. Unfortunately, all publications in this field were strictly secret and nobody in the world knew about this priority of the Soviet scientists. [Pg.235]

Mainly thanks to Neuymin s activity, the first in the world 50 W solid oxide fuel cell based on yttrium-stabilized zirconia electrolyte was built in 1965 and tested for 1000 h in the Laboratory of the Electrolytes. All kinds of oxygen sensors were developed by him or under his supervision. On the base of these scientific achievements, the Soviet industry began the production of the first sensors and laboratory oxygen analyzers, e.g., Agate, ANG, and SIVE. Sensors for detecting oxygen in the copper and iron melts were also developed by Neuymin and his co-workers. [Pg.246]

Ceria affords a number of important applications, such as catalysts in redox reactions (Kaspar et al., 1999, 2000 Trovarelli, 2002), electrode and electrolyte materials in fuel cells, optical films, polishing materials, and gas sensors. In order to improve the performance and/or stability of ceria materials, the doped materials, solid solutions and composites based on ceria are fabricated. For example, the ceria-zirconia solid solution is used in the three way catalyst, rare earth (such as Sm, Gd, or Y) doped ceria is used in solid state fuel cells, and ceria-noble metal or ceria-metal oxide composite catalysts are used for water-gas-shift (WGS) reaction and selective CO oxidation. [Pg.281]

The SOFC is a complete solid-state device that uses an oxide ion-conducting ceramic material as the electrolyte. The electrolyte is a nonporous solid, such as Y2O3 stabilized Zr02 with conductivity-based oxygen ions [122, 128, 142-144]. Yttria-stabilized zirconia (YSZ) is the most commonly used material for the electrolyte. It was first used as a fuel cell electrolyte by Baur and Preis in 1937 [145]. The anode is usually made of a C0-Z1O2 or Ni-Zr02 cement [13, 95, 146, 147], while the cathode is made of Sr-doped LaMnOs (LSM) [13,148-150],... [Pg.63]

A key factor in the possible applications of oxide ion conductors is that, for use as an electrolyte, their electronic transport number should be as low as possible. While the stabilised zirconias have an oxide ion transport number of unity in a wide range of atmospheres and oxygen partial pressures, the BijOj-based materials are easily reduced at low oxygen partial pressures. This leads to the generation of electrons, from the reaction 20 Oj + 4e, and hence to a significant electronic transport number. Thus, although BijOj-based materials are the best oxide ion conductors, they cannot be used as the solid electrolyte in, for example, fuel cell or sensor applications. Similar, but less marked, effects occur with ceria-based materials, due to the tendency of Ce ions to become reduced to Ce +. [Pg.39]

Commercial alkaline electrolysis occurs at temperatures up to 150 °C and pressures to 30 bar,96 and super critical electrolysis to 350 °C and 250 bar.102 Although less developed than their fuel cell counterparts which have 100 kW systems in operation and developed from the same oxides,103 zirconia and related solid oxide based electrolytes for high temperature steam electrolysis can operate efficiently at 1000 °C,104,105 and approach the operational parameters necessary for efficient solar... [Pg.115]


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Base electrolytes

Electrolyte fuel cells, solid

Electrolytes cells

Electrolytes fuel cell

Electrolytic cell

Electrolytic oxidation

Electrolytic oxides

Fuel cell oxidants

Fuel cells solid oxide

Fuel oxidation

Fuel solid oxide

Oxidants, solid

Oxidation cell

Oxidation solids

Oxide Fuel Cells

Oxide fuels

Oxidizing solid

Solid fuel cell

Solid fuels

Solid oxide

Solid oxide cells

Solid oxide fuel cell electrolyte

Solid oxide fuel cells zirconia-based

Solid oxidizers

Solide fuel cell

Zirconia based electrolytes

Zirconia cell

Zirconia electrolytes

Zirconia fuel cell

Zirconia solid electrolytes

Zirconia-based

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