Noble metal catalyst layer, membrane electrode assembly, and method for producing noble metal catalyst layer
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United States of America Patent
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Jan 9, 2018
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Mar 26, 2013
filing date -
Mar 26, 2012
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Abstract
According to one embodiment, the noble metal catalyst layer includes first noble metal layer and a second noble metal layer formed on the first noble metal layer. The first noble metal layer includes a first noble metal element and has a porosity of 65 to 95 vol. %, a volume of pores having a diameter of 5 to 80 nm accounts for 50% or more of a volume of total pores in the first noble metal layer. The second noble metal layer includes a second noble metal element, and has an average thickness of 3 to 20 nm and a porosity of 50 vol. % or less.
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