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RISS 인기검색어
- 검색키워드
- 주제어 : Kinetic spray technique (검색결과 3 건)
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Kim, Hyungsub,Choi, Dahyun,Kim, Kwangmin,Chu, Wonshik,Chun, Doo-Man,Lee, Caroline Sunyong Elsevier 2018 Solar energy materials and solar cells Vol.177 No.-
<P><B>Abstract</B></P> <P>The electrochromic (EC) performance of a WO<SUB>3</SUB> film fabricated using a kinetic spray technique (nanoparticle deposition system, NPDS) was examined as a function of the particle size and phase of the WO<SUB>3</SUB> particles. The total transmittance change of the deposited WO<SUB>3</SUB> film containing crystalline nano-sized WO<SUB>3</SUB> particles was 56% at 800nm, which resulted in a large shift in its transmission spectrum after coloring. Moreover, the charge density of the EC film using crystalline nano-sized WO<SUB>3</SUB> particles was 22.06mCcm<SUP>−2</SUP>, which was 2.8 times higher than that of the film composed of crystalline micro-sized WO<SUB>3</SUB> particles (7.97mCcm<SUP>−2</SUP>). Using crystalline nano-sized WO<SUB>3</SUB> particles greatly increased the surface area, increased the number of absorption sites for Li ions inside the film, and thereby improved the charge density and transmittance. The transmittance change of the EC films using dual-phased nano-sized WO<SUB>3</SUB> particles was 64% (at 800nm), which was still higher than that with crystalline nano-sized WO<SUB>3</SUB> particles. The amorphous phase in the dual-phase nano-sized WO<SUB>3</SUB> film provided good diffusion of Li ions; it had a high diffusion coefficient of 1.53 × 10<SUP>−12</SUP> cm<SUP>2</SUP> s<SUP>−1</SUP> that derived from its loosely packed atomic structure. The amorphous region in a heterostructured WO<SUB>3</SUB> film was effective for the fast diffusion of Li ions, while the crystalline nano-sized region in such a film provided a large surface area for an increased number of absorption sites for Li ions. This resulted in a dramatic improvement of the EC performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Different size and phase of WO<SUB>3</SUB> particles were deposited using kinetic spray technique. </LI> <LI> Varying size and phase of the WO<SUB>3</SUB> particles, change charge density. </LI> <LI> Nano WO<SUB>3</SUB> provided more absorption sites for Li ions, which improved EC performance. </LI> <LI> Amorphous/crystalline heterostructured WO<SUB>3</SUB> resulted in loosely packed atomic structure. </LI> <LI> Amorphous/crystalline heterostructured WO<SUB>3</SUB> showed the best EC performance. </LI> </UL> </P>
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김형섭,김광민,최다현,이민지,추원식,안성훈,천두만,이선영 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.2
WO3 electrochromic (EC) and ATO ion storage films were fabricated by a kinetic spray technique at various substrate heating temperatures. The optimal heating condition for WO3 deposition was 80oC, which provided a total transmittance change of 31%. Furthermore, the total transmittance change (at 800 nm) of the WO3 EC cell fabricated with the ATO ion storage layer deposited at 150oC was 42%, which was caused a comparably large shift in the transmittance. The charge/discharge density of the EC cell with the ATO ion storage layer deposited at 150oC was 11.12-11.37 mC cm-2. Finally, the cyclic transmittance of 40% was maintained for 1 h. The uniform and densely packed microstructure that resulted from the heated substrate had good inter-grain and particles connections that provided sufficient absorption sites for ions. Therefore, it was established that microstructural control of the EC and ion storage layers are crucial to improving EC performance.
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김광민,최다현,김형섭,이민지,추원식,안성훈,천두만,이선영 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.3
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.
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