US 12,444,754 B2
Electrochemical oxygen reduction catalyst, air electrode, fuel cell, and metal-air cell
Keiichi Okubo, Toyota (JP); Tsutomu Ioroi, Ikeda (JP); Shin-Ichi Yamazaki, Toyonaka (JP); and Masafumi Asahi, Ikeda (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Jan. 30, 2023, as Appl. No. 18/161,117.
Claims priority of application No. 2022-051204 (JP), filed on Mar. 28, 2022.
Prior Publication US 2024/0274838 A1, Aug. 15, 2024
Int. Cl. H01M 4/90 (2006.01); H01M 4/92 (2006.01); H01M 8/1018 (2016.01); H01M 12/08 (2006.01); H01M 4/86 (2006.01); H01M 8/10 (2016.01)
CPC H01M 4/9008 (2013.01) [H01M 4/921 (2013.01); H01M 4/925 (2013.01); H01M 8/1018 (2013.01); H01M 12/08 (2013.01); H01M 2004/8689 (2013.01); H01M 2008/1095 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An electrochemical oxygen reduction catalyst comprising:
metal particles having oxygen reduction activity;
an additive; and
primary particles of a carrier having pores, wherein:
the additive is at least one organic nitrogen compound;
the metal particles are supported on the carrier; and
in a case where metal particles that are present on an outermost surface of the primary particles of the carrier are defined as outer particles, and metal particles that are present on an inner side of the outermost surface of the primary particles of the carrier are defined as inner particles,
a ratio of a total surface area of the outer particles to a total surface area of the inner particles (the total surface area of the outer particles/the total surface area of the inner particles) is 0.36 or more.