| 摘要 |
Provided are a highly durable, highly active electrode catalyst for oxygen reduction that does not employ platinum group elements, said platinum group elements being extremely expensive and the reserves thereof being small, and a membrane electrode assembly and fuel cell system that employ the electrode catalyst for oxygen reduction. The electrode catalyst for a fuel cell, the main component of which is carbon containing boron and/or nitrogen atoms in addition to iron, is characterized by including at least one element selected from the lanthanide group. Specifically, the electrode catalyst is characterized by the lanthanide content in relation to the total iron and lanthanide content of the catalyst being 20-60 at%. |
