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RISS 인기검색어
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- 저자 : Dechun Zou (검색결과 4 건)
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Liu, Guicheng,Wang, Manxiang,Wang, Hui,Ardhi, Ryanda Enggar Anugrah,Yu, Hyunjin,Zou, Dechun,Lee, Joong Kee Elsevier 2018 Nano energy Vol.49 No.-
<P><B>Abstract</B></P> <P>The performances of fiber dye-sensitized solar cells (FDSSCs), in terms of charge collection efficiency, light-harvesting ability, and structural stability, are improved through a novel hierarchically structured photoanode based on a Ti microridge/nanorod-modified wire substrate. The microridge made of several Ti micropits is inserted into TiO<SUB>2</SUB> layer to shorten the photoelectron transport distance from the original place in the TiO<SUB>2</SUB> layer to substrate and to increase the electron transport rate. The Ti micropits are used as light-gathering centers to collect the reflected light. Meanwhile, the Ti nanorods are evenly distributed on the surface of the microridge-coated Ti wire substrate, which increases the contact area between the substrate and the TiO<SUB>2</SUB> layer in order to suppress the electron recombination and scatters the incident light to further improve the light-harvesting ability. Therefore, the charge collection and power conversion efficiencies of the novel FDSSC have been accordingly enhanced by 17.7% and 61.6%, respectively, compared with traditional FDSSC. Moreover, the structural stability of the novel FDSSC has been strengthened.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchically structured photoanode substrate is a Ti microridge/nanorod-modified wire. </LI> <LI> Novel design enhances charge collection and light-harvesting abilities, concurrently. </LI> <LI> Novel FDSSC exhibits the highest PCE of 8.128% in the field of nanocrystalline-based FDSSCs so far. </LI> <LI> Ti microridges shorten photoelectron transport distance and are used as light-gathering centers. </LI> <LI> Ti nanorods suppress electron recombination and scatters the incident light. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The performances such as charge collection efficiency, light-harvesting ability and structural stability of fiber dye-sensitized solar cells (FDSSCs) are improved through a novel hierarchically structured photoanode based on a Ti microridge/nanorod-modified wire-substrate.</P> <P>[DISPLAY OMISSION]</P>
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Low-Temperature Synthesis of Near-Monodisperse Globular MoS2 Nanoparticles with Sulphur Powders
Hui Wang,Xuequan Li,Kai Yan,유계성,Weixing Song,Ting Shen,Dechun Zou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.8
Nanoparticles (NPs) with high uniformity have been extensively investigated for their excellent chemical stability. Near-monodisperse globular MoS2 NPs were prepared with sulphur powders (SPs) as a sulphur source by a one-pot polyol-mediated process without surfactants, transfer agents and toxic agents at 170–190 ℃. The as-processed SPs greatly affected the formation of the MoS2 NPs after low-activity sulphur (S8)n was reassembled from common SPs (S8). The average size of MoS2 NPs can be reduced remarkably from 100–200 nm to 50 nm by introducing low amounts of MnCl2. A preliminary four-step growth mechanism based on the aggregation-coalescence model was also proposed. This green and simple method may be an alternative to the common hot-injection and heating-up methods for the preparation of monodisperse NPs, particularly transition metal dichalogenides.
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Liu, Guicheng,Wang, Hui,Wang, Manxiang,Liu, Wenbing,Anugrah Ardhi, Ryanda Enggar,Zou, Dechun,Lee, Joong Kee Elsevier 2018 ELECTROCHIMICA ACTA Vol.267 No.-
<P><B>Abstract</B></P> <P>A spring-like Ti@TiO<SUB>2</SUB> nanowire array wire has been introduced into a stretchable fiber-shaped dye-sensitized solar cell (FDSSC) as a photoanode to achieve high flexibility and elasticity in this paper. Given the TiO<SUB>2</SUB> layer, which was prepared by a hydrothermal reaction in the optimized NaOH concentration of 2.5 mol L<SUP>−1</SUP>, with a 1D structure and high adhesion between the TiO<SUB>2</SUB> nanowire array and the Ti wire substrate, the novel FDSSC still possesses photoelectric conversion efficiency retention rates of approximately 97.00% and 95.95% after bending to a radius of 1.0 cm and stretching to 100% strain, respectively. EIS result shows the degradation mechanism of the FDSSC photoelectric performance: the bending test leads to more terrible electron combination; the stretching operation increases the internal resistance and charge-transfer resistance at the counter electrode. Moreover, it's worth noting that, this is the first time to show a 100%-stretching degree in the FDSSC research field so far.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A fiber-shaped, stretchable, TiO<SUB>2</SUB> nanowire array-based DSSC was reported firstly. </LI> <LI> Using EIS analysis method to analyse effect of bending and stretching on FDSSC performance. </LI> <LI> Photoelectric conversion efficiency retention rate of 95.95% after stretching to 100% strain. </LI> <LI> High flexibility with 97.00% performance retention rate at bending radius of 1 cm. </LI> </UL> </P>
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