Investigation of Varying Particle Sizes of Dry-Deposited WO3 Particles in Relation to Performance of Electrochromic Cell
- 24 Downloads
Electrochromic cells were fabricated via a nanoparticle deposition system (NPDS) using different particle sizes of monoclinic tungsten oxide (WO3). Mixtures of micro- and nano-sized WO3 powders in the ratios of WO3 (micro):WO3 (nano) = 9:1, 5 : 5 and 1 : 9 vol%, were used in this study. NPDS, which was used to fabricate the electrochromic layer, is a low-cost process that can cover a large deposition area and provides a highly porous film. This method can replace sol-gel and sputtering methods, which are expensive and have environmental issues. The WO3 electrochromic layers displayed different surface structures that could adsorb Li+ ions. The transmittance change, cyclic switching speed and coloration efficiency (CE) results demonstrated that the electrochromic cell made with the mixed WO3 (micro):WO3 (nano) powders had better performance than that of the electrochromic cell made with separate micro-sized single powders. Various analyses showed that the WO3 mixed powders contained larger sites for Li+ ion adsorption compared with the single-sized powder because of a structure consisting of a compact layer of micro-WO3 with a porous layer of nano-WO3. Consequently, a cell composed of mixed-particle electrochromic layer showed higher transmittance change, CE and electrochromic performance than a cell made with a micro-sized single powder.
KeywordsAntimony-doped tin oxide Electrochromic Kinetic spray technique Particle size control Tungsten oxide
Unable to display preview. Download preview PDF.
- 2.Kim, H., Kim, K., Choi, D., Lee, M., Chu, W.-S., et al., “Microstructural Control of the Electrochromic and Ion Storage Layers on the Performance of an Electrochromic Device Fabricated by the Kinetic Spray Technique,” International Journal of Precision Engineering and Manufacturing-Green Technology, vol. 5, no. 2, pp. 231–238, 2018.CrossRefGoogle Scholar
- 3.Monk, P., Mortimer, R., and Rosseinsky, D., “Electrochromism and Electrochromic Devices,” Cambridge University Press, 2007.Google Scholar
- 7.Granqvist, C. G., “Handbook of Inorganic Electrochromic Materials,” Elsevier, 1995.Google Scholar
- 9.Chun, D.-M., Kim, M.-H., Lee, J.-C., and Ahn, S.-H., “A Nano-Particle Deposition System for Ceramic and Metal Coating at Room Temperature and Low Vacuum Conditions,” International Journal of Precision Engineering and Manufacturing, vol. 9, no. 1, pp. 51–53, 2008.Google Scholar
- 10.Chun, D.-M., Choi, J.-O., Lee, C. S., Kanno, I., Kotera, H., et al., “Nano-Particle Deposition System (NPDS): Low Energy Solvent-Free Dry Spray Process for Direct Patterning of Metals and Ceramics at Room Temperature,” International Journal of Precision Engineering and Manufacturing, vol. 13, no. 7, pp. 1107–1112, 2012.CrossRefGoogle Scholar
- 11.Chun, D.-M., Choi, J.-O., Lee, C. S., and Ahn, S.-H., “Effect of Stand-Off Distance for Cold Gas Spraying of Fine Ceramic Particles (< 5 μm) under Low Vacuum and Room Temperature Using Nanoparticle Deposition System (NPDS),” Surface and Coatings Technology, vol. 206, Nos. 8–9, pp. 2125–2132, 2012.CrossRefGoogle Scholar
- 21.Lee, J., Yim, C., Lee, D. W., and Park, S. S., “Manufacturing and Characterization of Physically Modified Aluminum Anodes Based air Battery with Electrolyte Circulation,” International Journal of Precision Engineering and Manufacturing-Green Technology, vol. 4, no. 1, pp. 53–57, 2017.CrossRefGoogle Scholar