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Find video protocols related to scientific articles indexed in Pubmed.
Cobalt sulfide nanosheet/graphene/carbon nanotube nanocomposites as flexible electrodes for hydrogen evolution.
Angew. Chem. Int. Ed. Engl.
PUBLISHED: 09-07-2014
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Flexible three-dimensional (3D) nanoarchitectures have received tremendous interest recently because of their potential applications in wearable electronics, roll-up displays, and other devices. The design and fabrication of a flexible and robust electrode based on cobalt sulfide/reduced graphene oxide/carbon nanotube (CoS2 /RGO-CNT) nanocomposites are reported. An efficient hydrothermal process combined with vacuum filtration was used to synthesize such composite architecture, which was then embedded in a porous CNT network. This conductive and robust film is evaluated as electrocatalyst for the hydrogen evolution reaction. The synergistic effect of CoS2 , graphene, and CNTs leads to unique CoS2 /RGO-CNT nanoarchitectures, the HER activity of which is among the highest for non-noble metal electrocatalysts, showing 10?mA?cm(-2) current density at about 142?mV overpotentials and a high electrochemical stability.
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Hollow nanospheres constructed by CoS2 nanosheets with a nitrogen-doped-carbon coating for energy-storage and photocatalysis.
ChemSusChem
PUBLISHED: 03-11-2014
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Hierarchical CoS2 hollow nanospheres (HSs) with a nitrogen-doped-carbon coating (NC@CoS2 ) are fabricated by a simple solution method. The uniform 300 nm-sized NC@CoS2 HSs are composed of ultrathin nanosheet subunits with a thickness of around 2 nm. It was found that polyvinylpyrrolidone and ethylenediamine not only controlled the morphology of the products, but also provided the sources of nitrogen-doped carbon. Benefiting from their unique structural characteristics, hierarchical NC@CoS2 HSs can be applied in lithium-ion batteries, supercapacitors, and photocatalysis. When evaluated as an electrode material, NC@CoS2 with a coating of optimal thickness showed a high lithium-storage capability with a good cycling stability. Moreover, NC@CoS2 had a remarkable supercapacitive performance and photocatalytic activity. The attractive electrochemical and photocatalytic performances were attributed to the overall structural features of the NC@CoS2 hollow spheres: the N-doped-carbon (NC) coating, hollow interior, and ultrathin nanosheets.
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Solvothermal-induced conversion of one-dimensional multilayer nanotubes to two-dimensional hydrophilic VOx nanosheets: synthesis and water treatment application.
ACS Appl Mater Interfaces
PUBLISHED: 10-14-2013
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Ultrathin 2D nanostructures have shown many unique properties and are attractive for various potential applications. Here, we demonstrated a strategy to synthesize ultrathin VOx nanosheets. The as-obtained ultrathin VOx nanosheets showed a large Brunauer-Emmett-Teller (BET) surface area of 136.3 m2 g(-1), which is much larger than that of 1D multilayer VOx nanotubes. As a proof of concept, these hydrophilic ultrathin nanosheets were applied in water treatment and exhibited excellent absorption capability to remove Rhodamine B (RhB) in wastewater owing to their large specific surface area, good hydrophilic property, and more negative zeta potential. In addition, this method could be generalized to prepare other 2D nanostructures with great potential for various attractive applications.
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In situ growth of NiCo(2)S(4) nanosheets on graphene for high-performance supercapacitors.
Chem. Commun. (Camb.)
PUBLISHED: 09-20-2013
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We demonstrate a facile hydrothermal method for growth of ultrathin NiCo2S4 nanosheets on reduced graphene oxide (RGO), which exhibit remarkable electrochemical performance with higher capacitance and longer cycle life than the bare NiCo2S4 hollow spheres (HSs).
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Synthesis of Porous, Hollow Metal MCO3 (M=Mn, Co, Ca) Microstructures and Adsorption Properties Thereof.
Chemistry
PUBLISHED: 05-29-2013
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Porous, hollow metal carbonate microstructures show many unique properties, and are attractive for various applications. Herein, we report the first demonstration of a general strategy to synthesize hollow metal carbonate structures, including porous MnCO3 hollow cubics, porous CoCO3 hollow rhombuses and porous CaCO3 hollow capsules. For example, the porous, hollow MnCO3 microcubes show larger Brunauer-Emmett-Teller (BET) surface areas of 359.5?m(2) ?g(-1) , which is much larger than that of solid MnCO3 microcubics (i.e., 12.03?m(2) ?g(-1) ). As a proof of concept, these porous MnCO3 hollow microcubes were applied to water treatment and exhibited an excellent ability to remove organic pollutants in waste water owing to their hollow structure and large specific surface area.
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Electrospun porous NiCo2O4 nanotubes as advanced electrodes for electrochemical capacitors.
Chemistry
PUBLISHED: 03-11-2013
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Novel, porous NiCo2O4 nanotubes (NCO-NTs) are prepared by a single-spinneret electrospinning technique followed by calcination in air. The obtained NCO-NTs display a one-dimensional architecture with a porous structure and hollow interiors. The effect of precursor concentration on the morphologies of the products is investigated. Due to their unique structure, the prepared NCO-NT electrode exhibits a high specific capacitance (1647?F?g(-1) at 1?A?g(-1)), excellent rate capability (77.3?% capacity retention at 25?A?g(-1)), and outstanding cycling stability (6.4?% loss after 3000 cycles), which indicates it has great potential for high-performance electrochemical capacitors. The desirable enhanced capacitive performance of NCO-NTs can be attributed to the relatively large specific surface area of these porous and hollow one-dimensional nanostructures.
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Polypyrrole nanorod networks/carbon nanoparticles composite counter electrodes for high-efficiency dye-sensitized solar cells.
ACS Appl Mater Interfaces
PUBLISHED: 12-27-2011
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Polypyrrole(PPy) nanorod networks with a high electrical conductivity of 40 S cm(-1) have been obtained in a high yield by employing an ion association of heparin-methylene blue as a new morphology-directing agent. The polypyrrole nanorod networks are mixed with different content of carbon nanoparticles to make PPy nanorod networks/carbon nanoparticles(PPy/C) counter electrodes. It is found that the PPy/C composite with 10% carbon content shows a lower charge transfer resistance and better catalytic performance for the reduction of I(3)(-), compared with the pristine PPy and carbon electrodes. The better catalytic performance is attributed to the interaction of the superior electrocatalytic activity of the unique polypyrrole nanorod networks and the carbon nanoparticles, which can accelerate triiodide reduction and electron transfer in the electrode. Under standard AM 1.5 sunlight illumination, the dye-sensitized solar cell based on the PPy/C composite with 10% carbon content as the counter electrode demonstrates a high efficiency of 7.2%, which is much higher than that of pristine PPy and carbon electrode-based DSCs and comparable to that of the thermal decomposed Pt-based DSC.
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Facile solution deposition of ZnIn2S4 nanosheet films on FTO substrates for photoelectric application.
Nanoscale
PUBLISHED: 05-05-2011
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In this paper, ZnIn(2)S(4) perpendicular nanosheet films have been directly deposited on FTO substrates by a facile hydrothermal method and investigated as the electrode materials for solar cells. The crystal structure, morphology, and optical properties of the obtained ZnIn(2)S(4) films were characterized by measurements such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive spectrum (EDS), X-ray photoelectron spectrum (XPS) and UV-vis spectra. The results revealed a uniform perpendicular ZnIn(2)S(4) film with thickness of 4 ?m and with an average nanosheet thickness of about 30 nm on FTO substrate, along with the band gap of 2.35 eV. The reaction conditions influencing the formation of ZnIn(2)S(4) films, such as the substrate treatment and reaction time were investigated. A possible mechanism for the formation of ZnIn(2)S(4) films on FTO substrates under hydrothermal conditions has been proposed. Furthermore, after heat treatment, the ZnIn(2)S(4) film electrode exhibited a photoelectrical conversion efficiency of 0.23% in FTO/ZnIn(2)S(4)/polysulfide/Au liquid-junction solar cell under AM 1.5 (100 mW cm(-2)).
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Quasi-solid-state dye-sensitized solar cells with polymer gel electrolyte and triphenylamine-based organic dyes.
ACS Appl Mater Interfaces
PUBLISHED: 11-12-2009
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We report on the application of a poly(methyl acrylate)/poly(ethylene glycol)-based polymer gel electrolyte and triphenylamine-based metal-free organic dyes in quasi-solid-state dye-sensitized solar cells. The poly(methyl acrylate)/poly(ethylene glycol) hybrid is beneficial to the entrapment of a large volume of liquid electrolyte. At 25 degrees C, the ionic conductivity and the triiodide ionic diffusion constant of the as-prepared polymer gel electrolyte are 2.1 mS cm(-1) and 2.3 x 10(-6) cm(2) s(-1), respectively. The quasi-solid-state solar cell sensitized by triphenylamine-based dyes attains an overall energy conversion efficiency of 5.76% at a light intensity of 30 mW cm(-2). The presence of poly(ethylene glycol) in the electrolyte obviously increases the conductivity and energy conversion efficiency compared to that without poly(ethylene glycol).
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Electrospun eggroll-like CaSnO3 nanotubes with high lithium storage performance.
Nanoscale
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Novel eggroll-like CaSnO(3) nanotubes have been prepared by a single spinneret electrospinning method followed by calcination in air for the first time. The electrospun sample as a lithium-ion battery electrode material exhibited improved cycling stability and rate capability by virtue of the high surface area and unique hollow interior structure, compared to nanorod-structured CaSnO(3).
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Facile approach to prepare porous CaSnO? nanotubes via a single spinneret electrospinning technique as anodes for lithium ion batteries.
ACS Appl Mater Interfaces
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CaSnO? nanotubes are successfully prepared by a single spinneret electrospinning technique. The characterized results indicate that the well-crystallized one-dimensional (1D) CaSnO? nanostructures consist of about 10 nm nanocrystals, which interconnect to form nanofibers, nanotubes, and ruptured nanobelts after calcination. The diameter and wall thickness of CaSnO? nanotubes are about 180 and 40 nm, respectively. It is demonstrated that CaSnO? nanofiber, nanotubes, and ruptured nanobelts can be obtained by adjusting the calcination temperature in the range of 600-800 °C. The effect of calcination temperature on the morphologies of electrospun 1D CaSnO? nanostructures and the formation mechanism leading to 1D CaSnO? nanostructures are investigated. As anodes for lithium ion batteries, CaSnO? nanotubes exhibit superior electrochemical performance and deliver 1168 mAh g?¹ of initial discharge capacity and 565 mAh g?¹ of discharge capacity up to the 50th cycle, which is ascribed to the hollow interior structure of 1D CaSnO? nanotubes. Such porous nanotubular structure provides both buffer spaces for volume change during charging/discharging and rapid lithium ion transport, resulting in excellent electrochemical performance.
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Mesoporous SnO2 agglomerates with hierarchical structures as an efficient dual-functional material for dye-sensitized solar cells.
Chem. Commun. (Camb.)
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Mesoporous SnO(2) agglomerates with hierarchical structures and a high surface area were fabricated through a molten salt method. The SnO(2) demonstrated high photoelectric conversion efficiencies of 3.05% and 6.23% (with TiCl(4) treatment) in dye-sensitized solar cells, which are attributed to its dual functionality of providing high dye-loading and efficient light scattering.
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Synthesis of AgInS(2) nanocrystal ink and its photoelectrical application.
Phys Chem Chem Phys
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This paper reports a hot-injection method of preparing AgInS(2) nanocrystals with different sizes and morphologies, starting with the capping agents of oleylamine and dodecylthiol, and varying the reaction conditions. The effects of the temperature and time on the growth of AgInS(2) nanocrystals are investigated. These parameters have a tremendous impact on the size and morphology of the nanocrystals, allowing the controlled synthesis of shapes including nanoparticles and nanorods. It has been found that the size of the nanoparticles and nanorods can be controlled by changing the time of nanocrystal growth. The evolution from nanoparticles to nanorods can be controlled by the reaction temperature. The possible formation mechanism and growth process of the AgInS(2) nanocrystals are discussed based on the experimental results. The AgInS(2) nanocrystal ink with a bandgap of 1.90 eV can produce crack-free films. As a proof-of-concept, thin film solar cells made by using such AgInS(2) films as absorber layers are tested for their viability as a type of solar cell material and are found to exhibit a measurable photovoltaic response.
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TiO2 derived by titanate route from electrospun nanostructures for high-performance dye-sensitized solar cells.
Langmuir
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We report the use of highly porous, dense, and anisotropic TiO(2) derived from electrospun TiO(2)-SiO(2) nanostructures through titanate route in dye-sensitized solar cells. The titanate-derived TiO(2) of high surface areas exhibited superior photovoltaic parameters (efficiency > 7%) in comparison to the respective electrospun TiO(2) nanomaterials and commercially available P-25.
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Facile fabrication of TiO2-graphene composite with enhanced photovoltaic and photocatalytic properties by electrospinning.
ACS Appl Mater Interfaces
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We report the fabrication of one-dimensional TiO(2)-graphene nanocomposite by a facile and one-step method of electrospinning. The unique nanostructured composite showed a significant enhancement in the photovoltaic and photocatalytic properties in comparison to TiO(2) as demonstrated in dye-sensitized solar cells and photodegradation of methyl orange.
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JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

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