Electrode catalyzer for fuel cell, fuel cell air electrode employing electrode catalyzer, and catalytic activity evaluation method for electrode catalyzer
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United States of America Patent
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Issued Date -
May 22, 2003
app pub date -
Nov 8, 2002
filing date -
Nov 20, 2001
priority date (Note) -
Abandoned
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Abstract
In a powder-form electrode catalyzer for a fuel cell which comprises catalyst particles that contain platinum, and an electrically conductive support supporting the catalyst particles, the ratio between a mean value D.sub.111 of crystallite diameters of catalyst particles in a direction perpendicular to a (111) crystal face and a mean value D.sub.100 of crystallite diameters of the catalyst particles in a direction perpendicular to a (100) crystal face is D.sub.100/D.sub.111<1, and a mean crystallite diameter of the catalyst particles is at most 5 nm. Due to a large surface area that functions as a catalyst and a great proportion of the catalyst particles that have (100) crystal faces present on surfaces, the electrode catalyzer has high oxygen reduction activity.
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