Three phase boundaries and electrochemically active zones of lanthanum strontium vanadate–yttria-stabilized zirconia anodes in solid oxide fuel cells

► The magnitude of three phase boundaries and electrochemically active zones in typical solid oxide fuel cell composite anodes. ► Correlations established between three phase boundaries and electrochemically active zones. ► Electrode microstructure constructed from a versatile packing and sintering...

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Bibliographic Details
Published in:	Electrochimica acta 2011-07, Vol.56 (17), p.5947-5953
Main Authors:	Ge, Xiaoming, Fu, Changjing, Chan, Siew Hwa
Format:	Article
Language:	eng
Subjects:	Aggregates Anodes Applied sciences Boundaries Electrochemically active zones Energy Energy. Thermal use of fuels Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc Exact sciences and technology Fuel cells Lanthanum Lanthanum strontium vanadate Microstructure modelling Particulate composites Sintering Solid oxide fuel cell anode Solid oxide fuel cells Three phase boundaries Zirconium dioxide
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Summary:	► The magnitude of three phase boundaries and electrochemically active zones in typical solid oxide fuel cell composite anodes. ► Correlations established between three phase boundaries and electrochemically active zones. ► Electrode microstructure constructed from a versatile packing and sintering model. ► Typical values of the active electrode thickness and in-depth penetration of electrocatalysts. Electrochemical reactions in solid oxide fuel cells take place around three-phase boundaries (TPBs). The electrochemically active zones (EAZs) are generated in three-dimensions around the TPBs of on-running SOFCs. This work discusses the behaviours of TPBs and EAZs via a case study on lanthanum strontium vanadate (LSV)–yttria-stabilized zirconia (YSZ) composite anode. A percolating binary particle aggregate, based on geometric random loose packing model and traditional sintering theory, is constructed to represent the LSV–YSZ anode. The TPB lengths of LSV–YSZ anodes are evaluated from the coordination numbers and sintering necks of the particles in the particle aggregate. Empirical interrelations among TPBs, EAZs, active electrode thickness, in-depth penetration of electrocatalysts of polarized LSV–YSZ anode are established.
ISSN:	0013-4686 1873-3859