Porous NiO nanoflake films covered with thin and uniform titania protective layers to improve the cycle durability

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The chemical bath deposition (CBD) is effective method to form a porous NiO thin film with 2-dimensionally networked nano wall structure for electrochromic smart window applications. However, NiO films prepared by CBD shows poor cyclic durability because low adhesion between transparent conducting oxide and NiO films. Also, a couple of interwined redox reaction leads to gradual hydration of the thin film and resulted in isolation of NiOOH by intercalated water molecules which cause the degradation of bleaching process. This study report a solution-derived NiO nanoflake films covered with thin and uniform titania protective layers to improve the cycle durability against repetitive electrochemical reaction under aqueous electrolyte. Hierarchical titania protective layer covered NiO nanoflake films are prepared by CBD method in combination with a liquid phase deposition method (LPD). The as-prepared NiO films have porous structure interconnected with 2-dimensionally networked nanoflake array. The thickness of titania protective layers on the NiO films were controlled by varying the deposition time of LPD with 4 h to 8 h. The results indicate that the highly improved cycling durability against repeated electrochemical redox process of NiO/titania composite films due to inhibition of gradual hydration from NiO to isolated NiOOH by titania protective layers. In this paper, porous NiO nanoflake films covered with thin and uniform titania protective layers to improve the cycle durability against repetitive electrochemical reaction under aqueous electrolyte were prepared by combining the CBD for NiO and LPD for titania.

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