Co-substitution in a Prussian blue analog with a hollow heterostructure for ultrahigh capacity and rate capability aqueous Zn 2+ batteries.

Nickel and manganese co-substitution into hollow Prussian blue nanocubes (H-PBMN) has been successfully carried out via utilizing a high-concentration polymer template to grow manganese-Prussian blue (PBM) and nickel-Prussian blue (PBN) through a slow nucleation process. Due to the hollow structure and double metal co-substitution, the properties of the electrode material have been optimized, and it presents an ultrahigh capacity of 138.4 mA h g -1 at 0.05 A g -1 .