Effect of valence state of cobalt in cobalt hexacyanoferrate coprecipitated at different temperatures on electrochemical behavior

Abstract

Cobalt hexacyanoferrate (CoFe(CN) 6 ; CoHCF) is coprecipitated as a cathode material in an Na-ion aqueous battery with varying solution temperatures of

Investigation of high-entropy Prussian blue analog as cathode material for aqueous sodium-ion batteries

“…This indicates that Co exists in two valence states: Co 2+ and Co 3+ . 31,32 For Ni 2p, the peaks at 855 eV, 856.2 eV, and 857.3 eV are ascribed to NiO, Ni(OH) 2 , and NiOOH, respectively. 33 A broad peak appeared at ∼861 eV that was decomposed and tted into four peaks, and of these, the peaks at 860.3 eV, 863.2 eV, and 864.8 eV are ascribed to NiO, Ni(OH) 2 , and NiOOH, respectively.…”