Hierarchically superstructured Prussian blue analogues: Spontaneous assembly synthesis and applications as pseudocapacitive materials

Hierarchically superstructured Prussian blue analogues (hexacyanoferrate, M = Ni^II, Co^II and Cu^II) are synthesized through a spontaneous assembly technique. In sharp contrast to macroporous-only Prussian blue analogues, the hierarchically superstructured porous Prussian blue materials are demonstrated to possess a high capacitance, which is similar to those of the conventional hybrid graphene/MnO₂ nanostructured textiles. Because sodium or potassium ions are involved in energy storage processes, more environmentally neutral electrolytes can be utilized, making the superstructured porous Prussian blue analogues a great contender for applications as high-performance pseudocapacitors.