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RISS 인기검색어
- 검색키워드
- 저자 : Dayaghi, Amir Masoud (검색결과 3 건)
- 무료
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Dayaghi, Amir Masoud,Kim, Kun Joong,Kim, Sun Jae,Sung, Yeon Soo,Choi, Gyeong Man Elsevier Sequoia 2017 Journal of Power Sources Vol. No.
<P><B>Abstract</B></P> <P>This study evaluates the effect of donor-doped SrTiO<SUB>3</SUB> (La<SUB>0.2</SUB>Sr<SUB>0.8</SUB>Ti<SUB>0.9</SUB>Ni<SUB>0.1</SUB>O<SUB>3-δ</SUB>, LSTN) coating on chromia growth on the surface of porous stainless steel (STS). During subsequent exposure to wet H<SUB>2</SUB> atmosphere at 800 °C, the porous STS oxidizes, and its Ohmic resistance increases slowly for 300 h to an area-specific resistance (ASR) ∼2.5 mΩ cm<SUP>2</SUP>, but at a much slower rate does uncoated STS and to a much lower ASR than that of uncoated STS (∼17.9 mΩ cm<SUP>2</SUP>). The estimated parabolic rate constant indicates that the porous LSTN-coated STS may be used at temperature <680 °C for ∼10 y.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The oxidation of porous stainless steel (STS) is examined in wet H<SUB>2</SUB> atmosphere. </LI> <LI> Porous STS can be used as a support in metal-supported solid oxide fuel cells. </LI> <LI> La and Ni co-doped SrTiO<SUB>3</SUB> (LSTN) is suggested as a protective coating for STS. </LI> <LI> The LSTN coating strongly reduces the oxidation rate of porous STS. </LI> <LI> The coated STS has the resistance of 2.5 mΩ cm<SUP>2</SUP> after 300 h in humid H<SUB>2</SUB> at 800 °C. </LI> </UL> </P>
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Kim, Youngkwang,Yu, Sangbae,Park, Jaeseoung,Yoon, Daseob,Dayaghi, Amir Masoud,Kim, Kun Joong,Ahn, Jin Soo,Son, Junwoo The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.13
<P>VO2-based ‘nanothermochromics’ that utilize the dispersion of VO2 nanoparticles in a passive host matrix have been evaluated as an economic strategy of “smart” windows to reduce energy consumption for heating and air conditioning in buildings. Here, we demonstrate a high-throughput roll-to-roll fabrication of thermochromic coatings for smart windows that can adapt their optical properties in accordance with external temperature. A large quantity (250 g) of VO2 nanoparticles (NPs) was synthesized at one time by controlled thermal treatment of bead-milled V2O5 NPs as a fast and inexpensive method. The amorphous nature of bead-milled V2O5 NPs combined with their nanometer size kinetically facilitates uniform synthesis of high-quality VO2 NPs even under less-reducing conditions than those used to obtain bulk VO2. This mass production of VO2 NPs could be used to fabricate the largest thermochromic coatings with VO2/PVP composites (12 cm × 600 cm) yet produced with excellent infrared modulation ability (∼45%). This scalable and continuous production of large coatings with thermochromic NPs will accelerate the commercialization of thermochromic coatings for smart windows, which will contribute to a large reduction in energy consumption to heat or cool buildings.</P>
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Kim, Kun Joong,Han, Hyeon,Defferriere, Thomas,Yoon, Daseob,Na, Suenhyoeng,Kim, Sun Jae,Dayaghi, Amir Masoud,Son, Junwoo,Oh, Tae-Sik,Jang, Hyun Myung,Choi, Gyeong Man American Chemical Society 2019 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.141 No.18
<P>Nucleation of nanoparticles using the exsolution phenomenon is a promising pathway to design durable and active materials for catalysis and renewable energy. Here, we focus on the impact of surface orientation of the host lattice on the nucleation dynamics to resolve questions with regards to “preferential nucleation sites”. For this, we carried out a systematic model study on three differently oriented perovskite thin films. Remarkably, in contrast to the previous bulk powder-based study suggesting that the (110)-surface is a preferred plane for exsolution, we identify that other planes such as (001)- and (111)-facets also reveal vigorous exsolution. Moreover, particle size and surface coverage vary significantly depending on the surface orientation. Exsolution of (111)-oriented film produces the largest number of particles, the smallest particle size, the deepest embedment, and the smallest and most uniform interparticle distance among the oriented films. Based on classic nucleation theory, we elucidate that the differences in interfacial energies as a function of substrate orientation play a crucial role in controlling the distinct morphology and nucleation behavior of exsolved nanoparticles. Our finding suggests new design principles for tunable solid-state catalyst or nanoscale metal decoration.</P> [FIG OMISSION]</BR>
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