| abstract |
PROBLEM TO BE SOLVED: To provide a metal complex exhibiting high oxygen reduction activity and high catalytic stability, an oxygen reduction electrode catalyst, a membrane electrode assembly for a fuel cell, and a fuel cell. SOLUTION: A metal complex in which a metal of metal azaanulene is coordinated to a ligand other than azaanulene, an oxygen reduction electrode catalyst containing the metal complex, a film electrode conjugate containing the oxygen reduction electrode catalyst, and the fuel. A fuel cell including a membrane electrode joint for a battery. [Selection diagram] None |