Molybdenum Oxide Electrochromic Materials and Devices

doi:10.15541/jim20200416

Abstract

Abstract:

Electrochromic materials show reversible color-changeable characteristics, which are widely used in smart windows, displays, adjustable reflective mirrors, electronic paper, military camouflage and other fields. Compared with other kinds of display devices, electrochromic display devices have advantages of multi-colors, high contrast, no blind visual angles, and maintainable color after power off. As a typical cathodic colored electrochromic material, molybdenum oxide exhibits advantages of short response time and colored state closer to the sensitive wavelength band of the human eye to light, so that the electrochromic devices composed of molybdenum oxide is important in the research. This paper briefly introduces the definitions and applications of electrochromism, electrochromic materials and devices. In particular, electrochromic technology recently realized a demonstration application in smart phones, indicating the good prospects for the future development of electrochromic technology. We summarized mainly the research progress of the preparation of molybdenum oxide films, the modification of molybdenum oxide, and the molybdenum oxide based electrochromic devices. Finally, we presented current existing problems and solutions on molybdenum oxide based electrochromic films and devices with development prospects.

Key words: molybdenum oxide, electrochromism, doping, composite

CLC Number:

TQ174

WANG Jinmin, HOU Lijun, MA Dongyun. Molybdenum Oxide Electrochromic Materials and Devices[J]. Journal of Inorganic Materials, 2021, 36(5): 461-470.

Figures/Tables 10

Fig. 1 Structure diagram of MoO6 octahedral unit cell[25]

Fig. 2 Schematic diagram of electrochromic device structure[27]

Fig. 3 Application field of water/solvothermal method (a), schematic diagram of water/solvothermal method equipment (b), and general steps of water/solvothermal preparation (c)[40]

Fig. 4 FESEM images of two MoO3 products at different magnifications[45]

Fig. 5 Chronocoulometry of six- to ten-layer MoO3 ?lm after applying +1.5/-1.5 V for 15/15 s (a) and effect of the number of MoO3 thin film layers on its charge density (b)[26] Colouful figures are available on roebsite

Fig. 6 Schematic diagram of spray pyrolysis system applied in the preparation of MoO3/C composite microspheres[54]

Fig. 7 SEM images of α-MoO3 crystals with a multi-layer stack structure at different magnifications (a-c), SEM image of MoO3 crystals obtained by calcination of commercial molybdic acid (MoO3·H2O) (d), and SEM image of α-MoO3 stacking with 44 layers (e)[57]

Fig. 8 Transmission spectra of undoped and Fe-Co-doped MoO3 films[61]

Fig. 9 In-situ kinetic properties measured at 632.8 nm for W0.71Mo0.29O3 film, PEDOT:PSS film and W0.71Mo0.29O3/PEDOT:PSS film (a), coloration efficiencies (b), and cycling stabilities (c) of the electrodes[66]

Fig. 10 Schematic diagram of a complementary electrochromic battery (a), visible-near-infrared transmission spectra of single active layer electrochromic battery (b) and complementary electrochromic batteries (c), discharge curves (current density is 0.05 mA·cm-2) of single-layer device and complementary device (d), and complementary electrochromic batteries lighting up the LED for 10 min after being colored at -2.5 V (e)[70]

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