Overview on grain-boundary and transport problems in solid oxide fuel cell

Tang, C. Q.; Liu, L.; Qian, Xin; Guo, Xingpeng; Sun, Yongming; Yao, K.L.; Cui, Kun

doi:10.1007/bf02375892

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…Much recent research has focused on enhancing the transport properties of YSZ at low temperatures to improve the commercial viability of SOFCs [2,3]. By operating at lower temperatures (\600°C) problems associated with deleterious interfacial reactions, differential thermal expansion, and gas sealing can be ameliorated.…”

Section: Introductionmentioning

confidence: 99%

Local electrical and dielectric properties of nanocrystalline yttria-stabilized zirconia

2008

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Grain core and grain boundary electrical and dielectric properties of nanocrystalline yttria-stabilized zirconia (YSZ) were analyzed using a novel nano-Grain Composite Model (n-GCM). Partially sintered pellets with average grain sizes ranging from 10 to 73 nm were analyzed over a range of temperatures using AC impedance spectroscopy (AC-IS). Local grain core and grain boundary conductivities, grain boundary dielectric constants, and effective grain boundary space charge widths were determined from the fitted circuit parameters. Required grain core dielectric constant data were provided by AC-IS measurements of single crystal YSZ over a range of temperatures. The local grain core conductivity of all the nanocrystalline samples was slightly decreased with respect to that of microcrystalline YSZ. Conversely, the local grain boundary conductivity was enhanced up to an order of magnitude compared to microcrystalline YSZ. At the nanoscale, there was a noticeable increase in local grain boundary dielectric constant versus single crystal values at the same temperature.

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Section: Introductionmentioning

confidence: 99%

Local electrical and dielectric properties of nanocrystalline yttria-stabilized zirconia

2008

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“…Major serious problems associated with SOFC anode materials running with hydrocarbons are the carbon formation/ deposition on the anode surface, poor sulfur tolerance and the longtime durability (the stability of the microstructure with desired porosity; namely an increase in densification at high temperature), the requirement for high electronic and ionic conductivity and also high catalytic activity at low temperature [2,3]. The densification of microstructure in anode layer decreases the cell performance because the number of triple phase boundaries (TPBs) decreases by elimination of porosity which is named as densification of anode [3e8].…”

Section: Introductionmentioning

confidence: 99%