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Effect of Deposition Conditions on Pt‐YSZ Cermet Anodes Made by PEVD
Author(s) -
Haldane M. A.,
Etsell T. H.
Publication year - 2005
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.200400086
Subject(s) - cermet , yttria stabilized zirconia , materials science , deposition (geology) , anode , chemical engineering , metallurgy , cubic zirconia , chemistry , ceramic , electrode , geology , engineering , paleontology , sediment
Yttria stabilized zirconia (YSZ) was deposited onto porous platinum networks by polarized electrochemical vapor deposition (PEVD) to make composite SOFC anodes. Although performance was poor, both before and after deposition, it was found to be better when high deposition temperatures were used, despite significant loss of electrode porosity during high temperature deposition. When the deposition temperature was lowered, from 1,050 °C to 900 °C, the level of porosity was maintained, but the power output was generally lower. Performance was partially recoverable by increasing the magnitude of the polarizing voltage during deposition. Typically, this led to an increase in deposition current, which in all cases exceeded the required amount for YSZ formation. By increasing the delivery rates of the source materials for yttria and zirconia, the amount of deposit formed could be increased, but excess oxygen at the anode prevented the formation of a continuous layer, in most cases.