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]