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Single-nanowire solar cells based on the surface-passivated CdS/Ag2S core-shell heterostructures

Single-nanowire solar cells based on the surface-passivated ...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Keqiang Chen Yueli Liu Zhuoyin Peng Yuqing Cheng Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

Single-nanowire solar cells have been considered to be the promising candidates as the nanoelectronical and flexibledevices, as they possess large surface-to-volume ratio and short minority carrier’stransferring path. Recently, there is some kinds of heterostructures are used to fabricated single-nanowire solar cells, such as CdS/Cu 2 S, CuInSe 2 /CdS. Among them, cadmium sulfide （CdS） and silver sulfide （Ag 2 S） have been attracted much attention for excellentoptoelectronic property, and surface-passivated is an important process to improve the efficiency. Till now, there is few works focused on the influence of the surface-passivated layer on the photovoltaicefficiency of the CdS/Ag 2 S core-shell single-nanowires solar cells. Herein, CdS nanowires were synthesized via vapor liquid solid（VLS） method, which is used as the core structure. To obtain CdS/Ag 2 S core-shell structure, cation exchange was carried out through mixing CdS solution with AgNO 3 solution.A ZnS passivation layer with the thickness of 0nm was achieved by chemical bath deposition （CBD） process. The single CdS/Ag 2 S core-shell nanowires were separated individually on the regular Au pattern fabricated by the photolithography technique, and then two ends of the nanowires were well contacted with Au electrodes by using the electron beam lithography. X-raydiffraction, SEM, X-ray spectroscopy and TEM techniques were used to character the microstructure, morphology and combining chemical state. The fabricated single-nanowire solar cells were irradiated under AM 1.5G illumination, an efficiency improvement from 1.8% to 2.4%was achieved due to the preventing charge carriers from reaching the surface by surface-passivated layer. In conclusion, CdS/Ag 2 Sheterostructures had been successfully prepared by cation exchange method, achieving an efficiency enhancement by forming the surface-passivated single-nanowire solar cells.

关键词： CdS/Ag 2 Sheterostructure cation exchange single-nanowire solar cells surface-passivated photovoltaicefficiency.

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Photodegradation of Gaseous Benzene by V2O5 Modified TiO2 Nanotube Arrays Catalysts

Photodegradation of Gaseous Benzene by V2O5 Modified TiO2 Na...

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1st Euro-Asia Zeolite Conference

作者： Chunxia Zhao Xiaoyu Li Wen Chen Xiaofang Wu Jinqiao Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of Technology

Indoor air quality has received immense ***,a carcinogenicity material,is a typical gaseous indoor *** oxidation has been studied extensively to purify the polluted air and to remove *** has been the most popular photocatalyst for environmental purification due to its good chemical stability,high oxidized activity, nontoxicity and low ***,its quantum efficiency in photocatalyst reaction is generally not high enough from application point of *** this work,novel TiO nanotube arrays modified with

关键词： TiO Photodegradation of Gaseous Benzene by V2O5 Modified TiO2 Nanotube Arrays Catalysts

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Influcence of the TiO2 and Cu2S nanowire arrays served as the photo-anodes and photo-cathodes on the efficiency of quantum dots sensitized solar cells

Influcence of the TiO2 and Cu2S nanowire arrays served as th...

引用

International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Zhuoyin Peng Yueli Liu Yinghan Zhao Keqiang Chen Yuqing Cheng Chen Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

Quantum dots sensitized solar cells (QDSSCs) have been attracted much attention as the next generation photovoltaic devices, due to the size-effect, high absorption coefficient and multiple excitation generation of quantum dots (QDs). Recently, Mn-CdS/CdSe and CuInS 2 /Mn-CdS sensitized solar cells has been obtained. However, the performance of the solar cells is still limited by the transfer barrier of the photo-induced electrons from nanoparticles. Nowadays, the single crystalline nanorods, nanowires and nanotubes arrays structure have been widely prepared to improve the electron transfer. In order to effectively enhance the efficiency, the nanowire structure is expected to be employed in both photo-anodes and counter electrodes for QDSSCs fabrication. In this work, Cu 2 S nanowire arrays are prepared by the solution method, which are employed to the photo-cathodes of solar cells, meanwhile, single crystalline anatase TiO 2 nanowires arrays are prepared by hydrothermal method and then be transferred to FTO substrate as the photo-anodes. CuInS 2 and Mn-CdS QDs are deposited on TiO 2 nanowire arrays films by using linking assembly method and chemical bath deposition. The structure, morphology and optical properties have been characterized by XRD, SEM, UV-Vis spectra. Under a solar illumination, the photovoltaic efficiency of this double-side nanowire structure based solar cells are obviously enhanced from 3.3% to 4.1%. In summary, the CuInS 2 /Mn-CdS QDs sensitized solar cells by using TiO 2 and Cu 2 S nanowire arrays as the photo-anodes and photo-cathodes have been fabricated. It is found that the photovoltaic performance of these QDSSCs is obviously enhanced comparing to the nanoparticles based solar cells. The reason is originated from that fact that the better electron transfer and injection from the one-dimensional nanowire arrays structure.

关键词： Anatase TiO 2 nanowire arrays, CuInS 2 /Mn-CdS quantum dots co-sensitized solar cells, Cu 2 S nanowire arrays counter electrodes, efficiency enhancement

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Photocatalytic Properties of Hierarchical and Nanoporous Titania Hollow Microspheres

Photocatalytic Properties of Hierarchical and Nanoporous Tit...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Chao Zhang Jie Yang Yueli Liu Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering Wuhan University of Technology

TiO 2 hollow structure materials had become one of the hot spots because of their low density, high specific surface areas, and good photocatalytic activity. Till now, there were lots of works focused on them, such as their extensive application in catalysis, pharmacy, sensing device, photon transmission and the basis material of DSSC. Nevertheless, the drawbacks which are out control of nanoparticles phases on the surface, raw materials wasted and visible region absorption of its structure doesn't make it get better development in the field of photocatalysis research. In the present work, sulfonated-polystyrene latex particles with the diameter varying from 500～700 nm were prepared by emulsifier-free emulsion polymerization using KPS as the anionic initiator, which was used as the template to synthesize porous titania microspheres with tunable shell thickness and void volume with the calcination at 400°*** coating reaction was processed in the mixed solvent of ethanol and acetonitrile at room temperature by hydrolyzing TBOT in the presence of ammonia. The thickness of titania shells could be controlled by varying the concentration contents of titanium tetrabutoxide (TBOT) in the ethanol/acetonitrile mixed solvents with an appropriate volume ratio (3:1). The titania shell was composed of tiny nanoparticles with a size range from 10～15 nm. The XRD analysis indicated that the calcinations temperature promoted the phase transformation of amorphous titania to an anatase TiO 2 phase, and then to rutile TiO 2 phase. To investigate the absorption properties of the TiO 2 hollow spheres, the UV–visible spectra of the TiO 2 hollow spheres were also measured, it was found that the prepared hollow sphere showed a stronger absorption in the UV-visible region than that of the P25 with a slight peak-shift towards longer wavelength, which may lead to the enhanced photocatalytic activity of tinatia hollow spheres by 53% if compared with P25 powders. In summary, hierarchical and na

关键词： TiO 2 hollow spheres, Template method, Photocatalytic property, Benzene gas

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Composite coatings with in-situ Formation for Fe-Ni-Cr alloy as bipolar plate of PEMFC

Composite coatings with in-situ Formation for Fe-Ni-Cr alloy...

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第五届世界氢能技术大会(WHTC2013)

作者： Dongming Zhang Zaiyi Wang Kaikai Huang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070PR China

Fe-Ni-Cr alloy is a potential material as the bipolar plate for proton exchange membrane fuel cell (PEMFC).However,its interfacial contact resistance is too high and the corrosion resistance is too low to survive in the hostile environment.A novel method by preparing the composite coating layers by in-situ method is reported in this *** plate is first treated in acid solution,and then is heat treated in vacuum at low temperature,at last is treated by electrochemical method.

关键词： Metallic bipolar plate for PEMFC Corrosion resistance ICR, composite coatings in-situ Formation

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OXYGEN REDUCTION REACTION KINETICS ON THE PLATINUM ORDERED NANOARRAYS ELECTRODE

OXYGEN REDUCTION REACTION KINETICS ON THE PLATINUM ORDERED N...

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第五届世界氢能技术大会(WHTC2013)

作者： Feng Cheng Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China

Electrode performance depends largely on the microstructure,hence the Ordered Nanoarrays Electrode (ONAE) has been attracted more and more *** presentation aims to assess the benefit and disadvantage of the Pt Order Nanoarrays electrode (Pt-ONAE) in terms of oxygen reduction reaction (ORR).Therefore the ORR kinetic equation was formulated for both Pt-ONAE and traditional Pt/C *** structure parameters of the electrode such as thickness/porosities,surface area,and tortuosity factor are critical to the ORR kinetic.

关键词： PEMFC ordered nanoarrays electrode oxygen-reduction reaction

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Design and synthesis of kinked nanowire structures for nanoelectronic bioprobes

Design and synthesis of kinked nanowire structures for nanoe...

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Nanophotonics, Nanoelectronics and Nanosensor, N3 2013

作者： Xu, Lin Jiang, Zhe Qing, Quan Mai, Liqiang Zhang, Qingjie Lieber, Charles M. WUT-Harvard Joint Nano Key Laboratory State Key Laboratory of Advanced Technology for Materials Synthesis and Processing University of Technology Wuhan 430070 China Department of Chemistry and Chemical Biology Harvard University Cambridge MA 02138 United States School of Engineering and Applied Science Harvard University Cambridge MA 02138 United States

ISBN: (纸本)9781557529763

We present design and synthesis of diverse functional kinked nanowire structures for nanoelectronic bioprobes, including (1) U-shaped KNWs with a nanoFET at the tip of the "U," (2) V-shaped KNWs with series multi-nanoFETs along the arm and at the tip of the "V," and (3) Wshaped multiplexed KNWs integrating nanoFETs at the two tips of "W". © OSA 2013.

关键词： Nanoelectronics

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Self-assembly of nanostructured proton exchange membranes for fuel cells

Self-assembly of nanostructured proton exchange membranes fo...

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作者： Tang, Haolin Li, Junrui Wang, Zhao Zhang, Huijie Pan, Mu Jiang, San Ping 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Chemistry Wuhan University of Technology Wuhan 430070 China Fuels and Energy Technology Institute and Department of Chemical Engineering Curtin University Perth WA 6102 Australia

ISBN: (纸本)9780841228139

Research interest for the synthesis and fabrication of novel proton conducting electrolytes which can be operated under the elevated temperatures and low relative humidification (RH) conditions has been increased extensively in recent years. Self-assembly is a powerful, efficient and environment-friendly technical tool to create highly ordered nano-structures with unique properties and has been extensively investigated and applied to the development of highly efficient proton conductive electrolyte materials for fuel cells. For instance, nano-structured Nafion membranes via self-assembly approaches can achieve significantly enhanced proton conducitivity under reduced humidity, as compared to pristine Nafion membranes. In this Chapter, an overview of the application of self-assembly technique in the synthesis and development of novel nano-structured proton exchange membranes and their electrochemical performance for fuel cells is presented. New opportunities for highly ordered and low humidity or anhydrous-operating proton exchange membranes are critically reviewed and discussed. © 2013 American Chemical Society.

关键词： Proton exchange membrane fuel cells (PEMFC)

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One-pot and Template-Free synthesis of Hollow Porous Cu2O Nano-spheres and Their Enhanced Performance in Lithium-Ion Batteries

One-pot and Template-Free Synthesis of Hollow Porous Cu2O Na...

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中国化学会第十七次全国电化学大会

作者： Dai-Song Chen Yu Li Hong-En Wang Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanHubei430070 State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanHubei430070 Laboratory of Inorganic Materials Chemistry(CMI) The University of Namur(FUNDP)NamurBelgium

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Batteries: Effect of Carbon Matrix Dimensions on the Electrochemical Properties of Na3V2(PO4)3Nanograins for High‐Performance Symmetric Sodium‐Ion Batteries (Adv. Mater. 21/2014)

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advanced materials 2014年第21期26卷

作者： Shuo Li Yifan Dong Lin Xu Xu Xu Liang He Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT‐Harvard Joint Nano Key Laboratory Wuhan University of Technology Wuhan 430070 P. R. China Department of Chemistry and Chemical Biology Harvard University Cambridge Massachusetts 02138 USA

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