Active Cocatalysts: Brownmillerite‐Type Crystalline Ca₂FeCoO₅ Ultrasmall Particles with Single‐Nanometer Dimensions as an Active Cocatalyst for Oxygen Photoevolution Reaction (Part. Part. Syst. Charact. 5/2020)

In article number 2000053, Etsushi Tsuji and co-workers demonstrate a new method to synthesize brownmillerite-type Ca2FeCoO5 ultrasmall particles with several nano-metric dimensions on TiO2 nanoparticles using reverse micelles. The photocatalytic activity of TiO2 for oxygen evolution increases by loading of Ca2FeCoO5 ultrasmall particles with 5 nm size, whereas the activity decreases by loading of Ca2FeCoO5 with more than 15 nm size.