Multi‐metal oxide (MMO) materials have significant potential to facilitate various demanding
reactions by providing additional degrees of freedom in catalyst design. However, a
fundamental understanding of the (electro) catalytic activity of MMOs is limited because of
the intrinsic complexity of their multi‐element nature. Additional complexities arise when
MMO catalysts have crystalline structures with two different metal site occupancies, such as
the spinel structure, which makes it more challenging to investigate the origin of the (electro) …

Multi-metal oxide (MMO) nanomaterials have significant potential to facilitate various
demanding (electro) catalytic reactions, but their intrinsic complexity hinders in-depth
understanding of the origin of the catalytic activity. In article number 2107868, Kug-Seung
Lee, Seoin Back, Yung-Eun Sung, Taeghwan Hyeon, and co-workers develop a structural
understanding of uniform-sized spinel-type MMO nanoparticles, which boosts the
electrocatalytic oxygen reduction reaction (ORR) activity. Physicochemical and …