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Quasi-Solid-State Electrochromic Cells with Energy Storage Properties Made with Inkjet Printing
Krystallia Theodosiou1, Panagiotis Giannopoulos1, Tilemachos Georgakopoulos1
1BRITE Solar Technologies, Patras Science Park, Stadiou Str., Platani, 26504 Patras, Greece.
Materials (Basel, Switzerland)
|July 26, 2020
Summary
Inkjet printing enables ambient deposition of electrochromic tungsten oxide and ion storage titanium dioxide layers. This method creates smart window devices with combined electrochromic and energy storage capabilities for smart buildings.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Conventional electrochromic glass uses vacuum deposition for active materials like WO3 and NiOx.
- Ambient deposition methods offer potential for cost reduction and simplified manufacturing.
Purpose of the Study:
- To develop an inkjet printing method for depositing electrochromic and ion storage layers under ambient conditions.
- To evaluate the performance of a large-area electrochromic device with integrated energy storage.
Main Methods:
- Inkjet printing of nanocrystalline WO3 (electrochromic) and cerium-modified TiO2 (ion storage) inks.
- Preparation of inks via wet methods, deposition on conductive substrates.
- Fabrication and electrochemical/optical characterization of a 90 cm2 quasi-solid-state device.
Main Results:
- Porous morphology of deposited layers facilitates high ion diffusion.
- The device exhibited high optical modulation (13.2% to 71.6% at 550 nm) under low bias.
- Achieved energy density of 1.95 × 10-3 mWh cm-2 and areal capacitance of 156.19 mF cm-2.
Conclusions:
- Inkjet printing is a viable ambient method for fabricating electrochromic devices with energy storage.
- The developed device shows promise for smart building applications requiring dynamic tinting and power supply.
