Electrochemical properties of nanostructured cobalt hexacyanoferrate containing K+ and Cs+ synthesized in water-in-oil AOT reverse microemulsions

► Cobalt hexacyanoferrate were synthesized in AOT microemulsions and aqueous solution. ► Formal potentials of hexacyanoferrate were sensitive to electrolyte cations. ► Cobalt hexacyanoferrate fabricated at w = 5-40 had enhanced electrochemistry stability. ► The modified electrode of CoHCF films in electrochromic display was also announced.