Chitosan-assisted WO3 Ultrathin Film and Electrochromic Performance†

doi:10.7503/cjcu20150176

Abstract

Abstract:

A nanocomposite material consisting of WO₃ and chitosan(CS) was fabricated by layer-by-layer(LbL) method in which CS was used as the additional component. The morphology and electrochemical behavior of the composite film were investigated by UV-Vis spectra, scanning electron microscopy(SEM) and cyclic voltammograms(CV). The electrochromic properties of the film were performed by in situ UV-Vis spectroscopy and electrochemical station. The results showed that the composite film was found to switch from colorless to deep blue, with the optical contrast of 48.0% and coloration efficiency of 58.5 cm²/C. Furthermore, the switching times were 9.5 s for coloration and 1.8 s for bleaching. Obviously, chitosan plays an important role in enhancing electrochromic performance of WO₃-based material.

Key words: WO3, Chitosan, Layer-by-layer, Electrochromic performance, CS/WO3 nanocomposite film

CLC Number:

O631

TrendMD:

LIU Shuping, LIU Yichun, WANG Wei. Chitosan-assisted WO₃ Ultrathin Film and Electrochromic Performance^†[J]. Chem. J. Chinese Universities, 2015, 36(6): 1202.

Figures/Tables 8

Fig.1 Formation of a [CS/WO3] film

Fig.2 UV-Vis absorption spectra of [CS/WO3]n (n=1—20) filmInset: plots of the absorbance values for quartz supported [CS/WO3]n composite films at 195 nm.

Fig.3 Top-view SEM(A) and cross-sectional SEM(B) images of [CS/WO3]20 films on a FTO glass

Fig.4 CV curves of the [CS/WO3]20 film at scan rate of 20—100 mV/s(A) and CV curves of [CS/WO3]20 and [PEI/WO3]20 films at scan rate of 100 mV/s(B)Inset of (A): the relationship of the peak currents as a function of scan rate; a. cathodic peak current; b. anodic peak current.

Fig.5 UV-Vis spectra of [CS/WO3]20 film under different potentials(A) and comparison between the UV-Vis spectra of [CS/WO3]20 and [PEI/WO3]20 films(B)

Fig.6 Potential(A), transmittance change(B), chronoamperometry curves(C) and coloration efficiency(D) at 800 nm of [CS/WO3]20 film during subsequent double-potential steps(-1.5 and 1.5 V)

Table 1 Optical contrast, switching times and coloration efficiency of [CS/WO3]n(n=10, 15, 20) and [PEI/WO3]20 films during subsequent double-potential steps(-1.5 and 1.5 V)

Sample	ΔA	ΔT(%)	t_c/s	t_b/s	CE/(cm²·C^-1)
[CS/WO₃]₁₀	0.08	16.7	2.0	0.9	46.9
[CS/WO₃]₁₅	0.28	37.1	6.1	1.7	49.8
[CS/WO₃]₂₀	0.43	48.0	9.5	1.8	58.5
[PEI/WO₃]₂₀	0.16	17.2	5.4	1.4	32.8

Fig.7 Cycle stability of [CS/WO3]20 film at 800 nm for the double potential stepping at 1 cycle(a), 100 cycles(b) and 200 cycles(c)

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Chitosan-assisted WO₃ Ultrathin Film and Electrochromic Performance^†

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