Fuel cell sohd conducting oxide

Most engineering materials are polycrystalline in nature. The sohd electrolytes (SEs) [1-3] used in solid oxide fuel cells (SOFCs) are made of crystallites with a size of typically few micrometers. The SEs conduct ions exclusively by definition, and there are several different types of oxide... 

As the name suggests, the electrolyte of a solid-oxide fuel cell is sohd it is a ceramic which is conductive of the oxide anion 0 at high temperature (typically beyond 700°C for standard materials). When the cell is supplied with hydrogen at the anode, the reactions taking place at the electrodes are as follows ... 

Certain requirements concerning mechanical performance and rehabihty must be fulfilled in all apphcations, e.g. thermally or electrically insulating materials (dense alumina for electronic circuit supports, thermally insulating closed-pore alumina or zirconia), catalyst supports, filter membranes and membrane supports (open-pore alumina), ionic conductors, oxygen sensors (dense zirconia) and oxygen-ion-conducting membranes in sohd oxide fuel cells, oxygen separators and catalytic membrane reactors (open-pore zirconia) [Atkinson ... 

The solid oxide fuel cell consists of electrolyte covered by anode and eathode layers. Those layers influence ionic conductivity (e.g. triple boundary phase processes). The material used, porosity and design of the electrodes exert a major influence over fuel cell voltage. Additionally, both electrolyte and electrodes can be built as multi-layers with varied compositions in the cross-section of the fuel cell. Then, the total area specific ionic resistance of the sohd oxide fuel cell can be estimated by the following relationship ... 

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