Preparation and Properties of NiO/PB Hybrid Electrochromic Fil

doi:10.15541/jim20160688

Abstract

Abstract:

The vertically grown NiO hierarchical nano-structures were synthesized on FTO-coated glass using a crystal-seed-assisted hydrothermal technique. The NiO/PB film was obtained by the electrodeposition of PB on the NiO film. The crystal structures of the synthesis products were identified by X-ray diffraction technique and the microstructure and morphology of the films were characterized by field emission scanning electron microscope. The electrochemical property experiments were performed with an electrochemical workstation and the optical properties of the devices were recorded by Lambda 950. The NiO/PB film is composed of nanosheets and thus forming a porous structure. The porous structure could accelerate the interface electron kinetics between the film and electrolyte because its large electrochemical active area. Higher charge-insertion density of the NiO/PB film over the same period indicates faster kinetics, which means that the NiO/PB film possesses fast electrochemical response. Compared with the single NiO film, the NiO/PB film exhibits highly enhanced electrochromic performances, i.e. high optical modulation (46% at 700 nm without background correction), high coloration efficiency of 141 cm²/C at voltage of 2.5 V, and fast response time of 6 s and 5 s for bleaching and coloration states, respectively.

Key words: NiO, PB, electrochromic, smart windows

CLC Number:

TQ174

YUE Yan-Fang, LI Hai-Zeng, LI Ke-Rui, WANG Jin-Min, ZHANG Qing-Hong, LI Yao-Gang, CHEN Pei, WANG Hong-Zhi. Preparation and Properties of NiO/PB Hybrid Electrochromic Fil[J]. Journal of Inorganic Materials, 2017, 32(9): 949-954.

Figures/Tables 10

Fig. 1 Schematic illustration for the electrochromic device preparation process

Fig. 2 XRD patterns of (a) as-prepared NiO film and (b) FTO- glass

Fig. 3 EDS mapping of Fe and Ni elements in the surface of NiO/PB film

Fig. 4 EDS analysis of the NiO/PB film

Fig. 5 FESEM morphologies of NiO film (a, b) and NiO/PB films (c, d)

Fig. 6 Cyclic voltammetry of NiO and NiO/PB films

Fig. 7 UV-Vis transmittance spectra of as-prepared ECD-1 (a) and ECD-2 (b)

Fig. 8 Switching time characteristics between the colored and bleached states for ECD-1 and ECD-2 measured at 700 nm with potential of -3 V and 2.5 V

Fig. 9 OD variation with respect to the charge density for (a) ECD-1 and (b) ECD-2 measured at 700 nm with a potential of 2.5 V

Fig. 10 Peak current evolution of the ECD-1 and ECD-2 during the step chronoamperometric cycles

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