WO3 Applied for ITO/PET Flexible Electrochromic Electrode

WO3 has good electrochromic property, that is, good heat insulation performance, so it is often used for the preparation of ITO/PET flexible electrochromic electrode, mainly by electrodeposition method. Since electrodeposition technology can be performed on any conductive substrate, experts have used the same electrodeposition technique to deposit hydrated tungsten trioxide nanosheets onto a copper foil, an aluminum foil, and an ITO/PET. The photograph of the flexible WO3·2H2O electrode prepared by electrodeposition method is shown as below.

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However, there are some problems with electrodeposition technology. The most important problem lies in cycle stability. At the beginning of the electrochemical reaction, the nanosheets with poor adhesion to the substrate will fall off, resulting in a decline in current density. On the whole, the current density tends to be stable. It proves that the cycle stability of the prepared film is not very poor. In addition, the obtained film tends to have poor adhesion to the substrate so that it cannot withstand lattice stress and volume change caused by the injection and extraction of ions and electrons.

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