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Porous WO 3 films with ultra-high transmittance modulation were successfully fabricated on different substrates by a novel, facile and economical pulsed electrochemical deposited method with 1.1 s interval time between each pulse. The near ideal optical modulation (97.7% at 633 nm), fast switching speed (6 and 2.7 s), high coloration efficiency (118.3 cm 2 C -1 ), and excellent cycling stability are achieved by the porous WO 3 on ITO-coated glass. The outstanding electrochromic performances of the porous WO 3 film were mainly attributed to the porous structure, which facilitates the charge-transfer, promotes the electrolyte infiltration and alleviates the expansion of the WO 3 during H + insertion compared to that of the compact structure. In addition, the relationships between the structural and electrochemical activity of the electrochromic WO 3 films were further explored by the scanning electrochemical microscopy. These results testify that the porous structure can promote the infiltration of electrolyte and reduce the diffusion path, which consequently enhance the electrochemical activity.

Ultra-large optical modulation of electrochromic porous WO3film and the local monitoring of redox activity

Ultra-large optical modulation of electrochromic porous WO₃film and the local monitoring of redox activity