Prussian blue analogues (PBAs) have become remarkable cathode materials utilized in the areas of lithium-ion batteries , sodium-ion batteries , zinc-ion batteries lithium-sulfur batteries , and electrocatalysis , etc, due to their open 3D channel frameworks, reversible redox properties and strong structural stability . What's more, as alternatives to metalorganic frameworks, PBAs also have the advantages of a straightforward synthetic procedure, low cost, and non-toxic nature, which enable their promising application in the field of electrocatalysis. However, PBAs are so far mostly used as sacrificial precursors to the synthesis of a wide range of metal oxide/phosphide/sulfide electrocatalysts , while the intrinsic advantageous properties of PBAs such as large surface areas, well-crystallized structures, and compositional flexibility have been largely ignored. Therefore, it is worth noting that the shaped PBAs could be promising OER electrocatalysts to explore the active phase transformation and electronic structure-activity relationships, which is crucial for deriving general and straightforward catalyst design guidelines.