“…[15,16] Prussian blue analogues (PBAs), as representative coordination polymer materials, are mainly composed of metal ions centers and cyanide ligand with a general formula of A x B[M(CN) 6 ]•nH 2 O (A: alkali metal, Li, Na, K; B and M: transition metal, Ni, Fe, Co, Zn, Mn, etc). [17][18][19] The diversity of transition metal ions enables PBAs to possess adjustable metal active sites, accompanied by their inherent characteristic open-framework structures, and their derived materials (alloys, [20] transition metal oxides, [21] chalcogenides, [22,23] phosphides, [24] etc.) exhibit uniform active sites and large specific surface areas, which have also been widely applied to electrocatalytic water splitting.…”