Colorless/Black Switching Electrochromic Device Based on WO3·xH2O and Reversible Metal Electrodeposition

doi:10.15541/jim20250017

Abstract

Abstract: Electrochromic (EC) smart windows utilizing reversible metal electrodeposition device (RMED) offer a compelling alternative for dynamically regulating the transmissions of optical and thermal energy. An EC device (ECD) is constructed by utilizing RME of Bi/Cu on WO₃·xH₂O film electrodeposited onto fluorine-doped tin oxide (FTO) transparent conductive glass. The electrolyte consists of CuCl₂, BiCl₃, KCl and HCl aqueous solution, supplying necessary components for both electrochemical and electrodeposition processes. The device shows the ability to rapidly transition between colorless and black states, which achieves a large optical modulation of 77.0% at 570 nm. In the black state, the ECD exhibits a near-zero transmittance in the wavelength range of 400-1100 nm. Furthermore, the device is able to maintain 96.6% of its initial optical modulation after coloration/bleaching cycling of 60,000 s, exhibiting a good cyclic stability. And this RMED has relatively high stability under open-circuit voltage and also possesses excellent heat insulation performance. The results offer a solution to overcome the limitations of RMEDs that have poor cyclic stability and improve the optical modulation of ECDs.

Key words: reversible metal electrodeposition, electrochromic, WO₃·xH₂O

WAN Xinyi, WANG Wenqi, LI Jiacheng, ZHAO Junliang, MA Dongyun, WANG Jinmin. Colorless/Black Switching Electrochromic Device Based on WO3·xH2O and Reversible Metal Electrodeposition[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250017.

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