Preparation and electrochromic properties study of ternary electrochromic materials based on MnO2, CoNi hydroxides and V2O5

By depositing V 2 O 5 on precursor co-CoNi films with MnO 2 pretreatment layer using cyclic voltammetry (CV), a ternary electrochromic (EC) film with high performance and multicolor characteristic was obtained in this work. Compared with binary electrochromic film with deposition of V 2 O 5 on CoNi hydroxide films directly, the introduction of MnO 2 enhanced the cyclic stability significantly through formation of a more compact micro morphology and appearance of more active sites in this case. In addition, the ternary film presents higher optical modulation, less response time, higher coloring efficiency, better color memory ability, larger color range and faster electrochemical kinetics. The excellent electrochromic performance of the obtained film makes it possible to manufacture multicolor transparent EC devices, and demonstrates a promising application prospect in related fields.