Zuxun Xu

Hubei University, Wu-han-shih, Hubei, China

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Publications (22)54.94 Total impact

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    ABSTRACT: Low Pt-loaded graphene nanocomposites were prepared using a two-step reduction process. Graphene dispersion was first prepared from graphene oxide using hydrazine hydrate as a reducing agent. Pt-reduced graphene oxide composites were then synthesized in the aqueous graphene dispersion at 90 °C without the need for another reductant. Pt/graphene composite films were then deposited on fluorine-doped tin oxide substrates using a simple drop-casting method at room temperature and subsequently used as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). Cyclic voltammetry and electrical impedance analysis show that the composite electrodes have high electrocatalytic activity toward iodide/triiodide reduction. The energy conversion efficiency of the Pt/graphene CE-based DSSC was found to be 1.9 % lower than that of cells with a Pt-based CE.
    Journal of Materials Science 06/2015; 50(12). DOI:10.1007/s10853-015-8998-9 · 2.31 Impact Factor
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    ABSTRACT: In this study, one- and two-step chemical reduction methods were compared in terms of the production of Pt/graphene nanocomposites with low platinum (Pt)-loadings. Cyclic voltammetry and electrical impedance analysis indicated that the composites displayed high electrocatalytic activity with respect to the reduction of iodide/triiodide. Furthermore, the Pt/RGO composites were deposited on fluorine-doped tin oxide substrates by drop coating and were applied as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The energy conversion efficiency of the DSSCs based on Pt/RGO CEs (prepared using the one-step reduction method) was only 0.9% lower than that of the Pt CE-based cell.
    Composites Science and Technology 03/2015; 113. DOI:10.1016/j.compscitech.2015.03.015 · 3.63 Impact Factor
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    ABSTRACT: Vertically ordered single-crystalline TiO2 nanorod arrays (NRAs) grown directly on transparent conductive substrates are of considerable interest for overcoming the limitations of current nanoparticle-based dye-sensitized solar cells (DSSCs) with the disordered network structure. However, the synthesis of such structures with high internal surface area is still challenging and desirable for highly efficient DSSCs. Herein, by introduction of a TiO2 nanocrystal seed layer, growth of long single-crystalline rutile TiO2 NRAs with high surface area has been demonstrated by a mild hydrothermal method combined with a chemical etching route. The chemical etching treatment developed here can effectively enlarge the surface area of rutile TiO2 NRAs for more dye-loading by splitting of original TiO2 nanorods into secondary nanowires with a reduced diameter. Accordingly, a DSSC constructed by 7 h-etched rutile TiO2 NRAs exhibits markedly enhanced efficiency of 4.69 %, compared to that of 1.30 % in the DSSCs based on un-etched TiO2 NRAs.
    Journal of Materials Science Materials in Electronics 03/2015; 26(3). DOI:10.1007/s10854-014-2543-5 · 1.97 Impact Factor
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    ABSTRACT: A TiO2 double-layer composite film consisting of hollow TiO2 boxes (HB-TiO2) as overlayer and commercial-grade TiO2 nanoparticles (P25) as underlayer is designed as the photoelectrode of dye-sensitized solar cells (DSSCs). The hollow TiO2 box has been employed as light-scattering part to increase the optical length in the film and enhance light-harvesting. It was found that the double-layer film cell with lower absorbed dye achieved the highest conversion efficiency and reach up to a maximum value of 6.4%, which is 226% higher than that of pure HB-TiO2 film cell (eta = 1.96%) and 57.2% higher than that of pure P25 particles film cell under identical film thickness at a constant irradiation of 100 mW cm(-2). The enhanced efficiency of double-layer film can be attributed to its light-scattering capability.
    Materials Research Bulletin 11/2014; 59:370-376. DOI:10.1016/j.materresbull.2014.07.012 · 2.29 Impact Factor
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    ABSTRACT: Water-soluble polyaniline/graphene nanocomposites have been prepared via a simple in-situ polymerization of aniline in graphene dispersion. TEM measurement confirmed that polyaniline was homogeneously coated on the graphene sheets. The nanocomposites solution can be used for film fabrication by common technology, such as drop coating. When these different polyaniline/graphene nanocomposites were applied as the counter electrode materials for dye-sensitized solar cells, the short-circuit current density and power-conversion efficiency of the devices were measured to be 12.19 mA cm-2 and 4.46%, respectively, which was comparable to 5.71% for the cell with a Pt counter electrode under the same experimental conditions.
    Reactive and Functional Polymers 06/2014; 79. DOI:10.1016/j.reactfunctpolym.2014.03.012 · 2.82 Impact Factor
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    ABSTRACT: Bi2O3 nanostructures with high surface-to-volume ratio are attracting particular interest in catalysis, gas sensors, solar-energy conversion, and so on. In this paper, we present the impact of annealing on morphology, structure, and optical properties of Bi2O3 nanotube-based urchin-like microarchitectures, which is very important to determine before their applications in many potential fields. Our results showed that below 400 °C, the microarchitectures possessed good thermal stability. While annealing at 500 °C, jointed nanoparticles with an average size of 350 nm were formed. On further increasing the annealing temperature to 600 °C, the microarchitectures were transformed into stable α-Bi2O3 microcrystal film with a larger particle size of about 800 nm. The optical bandgaps of the annealed products were also changed according to their changes of morphology and structure.
    physica status solidi (a) 11/2012; 209(11):2157-2160. DOI:10.1002/pssa.201228246 · 1.21 Impact Factor
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    ABSTRACT: Hierarchical ZnO microarchitectures have been fabricated on a large scale by a simple and economical citrate-mediated hydrothermal route for application in dye-sensitized solar cells (DSSCs). These flowerlike architectures are constructed by many interleaving nanosheets which have ultrathin thickness of about 5 nm. Compared with the DSSCs based on other forms of nanostructures, such as ZnO nanorods and nanoparticles, the DSSCs constructed by these hierarchical ZnO microarchitectures demonstrate a remarkable enhancement in photoelectric conversion efficiency. This enhanced performance is mainly due to the large surface area of the hierarchical microarchitectures for dye loading, and their special structural feature to ensure rapid transportation of electrons. Our results suggest that this new type of ZnO nanosheet-based microarchitectures is a promising material for application in DSSCs.
    Journal of Materials Science Materials in Electronics 10/2012; 23(10). DOI:10.1007/s10854-012-0682-0 · 1.97 Impact Factor
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    ABSTRACT: A novel and simple citrate-assisted solution approach has been developed for the shape-selective synthesis of Bi2O3 nanostructures with controllable bandgaps and morphologies at a relatively low temperature of 40 °C. Different distinctive morphologies, including nanorods, nanoplates, plate-built cylinders, nanoplates with holes, and nanorings, are created due to the selective adsorption of the citrate molecules on certain faces during crystal growth. The bandgaps and aspect ratios of the Bi2O3 nanostructures are easily tuned by modifying the product morphologies by adjusting the amount of trisodium citrate. More novel and complex Bi2O3 nanostructures with controllable morphologies and sizes can be manufactured with our method by optimizing the experimental parameters. The distinctive nanostructures presented here extend the family of Bi2O3 nanostructures, and they also provide new opportunities for exploring the potential applications of Bi2O3 in a number of fields including photocatalysis, gas sensors, and photoelectrochemistry.
    RSC Advances 03/2012; 2(8):3374-3378. DOI:10.1039/C2RA01203K · 3.71 Impact Factor
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    ABSTRACT: A novel TiO(2) double-layer (DL) film consisting of TiO(2) hollow spheres (HSs) as overlayer and single-crystalline TiO(2) nanorod arrays (RAs) as underlayer was designed as the photoanode of dye-sensitized solar cells (DSSCs). This new-typed TiO(2) HS/RA DL film could significantly improve the efficiency of DSSCs owing to its synergic effects, i.e. the relatively large specific surface area of TiO(2) HSs for effective dye adsorption, enhanced light harvesting capability originated from TiO(2) RA film, and rapid interfacial electron transport in one-dimensional TiO(2) nanorod arrays. The overall energy-conversion efficiency of 4.57% was achieved by the formation of TiO(2) DL film, which is 16% higher than that formed by TiO(2) HS film and far larger than that formed by TiO(2) RA film (η=0.99%). The light absorption and interfacial electron transport, which play important roles in the efficiency of DSSCs, were investigated by UV-vis absorption spectra and electrochemical impedance spectra.
    Journal of Colloid and Interface Science 09/2011; 365(1):46-52. DOI:10.1016/j.jcis.2011.08.073 · 3.55 Impact Factor
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    ABSTRACT: A simple and economical citrate-mediated hydrothermal route has been developed to fabricate three-dimensional hierarchical ZnO microarchitectures with high surface-to-volume ratio and large population of unconventional (0001) surface planes. This complex architecture with flowerlike morphology is assembled by many interleaving nanosheets which have ultrathin thickness of about 5 nm. According to the experimental results, a growth mechanism which involves the assembly of the nanosheets from nanoparticles into flowerlike morphology is proposed. Importantly, this type of hierarchically-structured ZnO displays a strong structure-induced enhancement of photocatalytic performance and exhibits a significantly improved photocatalytic activity in the photodegradation of methyl orange than that of other monomorphological ZnO, such as ZnOnanoparticles, nanorods, and nanosheets. In addition to the large specific surface areas due to ultrathin size of the nanosheet building blocks, the enhanced photocatalytic activity can mainly be ascribed to the special structural feature with good stability and high proportion of active (0001) planes. This work provides an efficient route for the structure-induced enhancement of photocatalytic performance by designing a desirable micro/nanoarchitecture, which could also be extended to synthesize other metal-oxide microarchitectures with superior photocatalytic performance.
    Journal of Materials Chemistry 03/2011; 21(12):4228-4234. DOI:10.1039/C0JM03390A · 7.44 Impact Factor
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    ABSTRACT: Graphene films with controllable thicknesses, electrical and optical properties are fabricated on variable substrates at room temperature by a simple, efficient and low-cost solution-based method. This process is completely compatible with flexible substrates (polyethylene terephthalate, PET), fluorine-doped tin oxide (FTO) conductive glasses, and even glassy carbon electrodes. The graphene films show excellent conductivity and electrochemical activity. The films prepared on FTO conductive glasses, as an alternative to ubiquitously employed platinum-based counter electrodes (CEs) for dye-sensitized solar cells (DSSCs), are demonstrated. The results suggest a new start in the direction of graphene CEs for the development of next generation of optoelectronics.
    Solid State Sciences 02/2011; 13(2-2):468-475. DOI:10.1016/j.solidstatesciences.2010.12.014 · 1.68 Impact Factor
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    ABSTRACT: A novel Bi2O3 urchin-like microarchitecture with high-density radially oriented Bi2O3 nanotubes (NTs) was fabricated by a one-step hydrothermal approach without any template or surfactant at a relative low temperature of 90 °C. The radial Bi2O3 NTs on the surface of nanourchins (NUs) were 4-7 nm in diameter and ˜1.7 μm in length. The mean wall thickness of the NTs was as thin as 1.5 nm. Based on the time-dependent evolutions of morphology examined by scanning electron microscope (SEM), a “rolling-up mechanism” was demonstrated to explain the formation of the ultrathin Bi2O3 NTs. The ultrathin and long NTs bring on the high surface-to-volume ratios of the Bi2O3 urchin-like microarchitectures, which makes them great potential applications in gas sensors, photocatalysis, environmental purification, and solar energy conversion.
    Journal of the Physical Society of Japan 09/2010; 79(9):4802-. DOI:10.1143/JPSJ.79.094802 · 1.48 Impact Factor
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    ABSTRACT: Pyroelectric hybrid materials were prepared from 4,5-dihydroxy-3-(phenyldiazenyl)naphthalene-2,7-disulfonic acid (C.I. Acid Red 29) and Nb or Ta alkoxides via a sol–gel process. The hybrid materials were analyzed and characterized using infrared spectrometry, atom force microscopy and thermal gravimetry differential thermal analysis. The dye was covalently linked to the inorganic network and organic–inorganic hybrid films had excellent pyroelectric character (average pyroelectric coefficient 1.79×10−6Ccm−2K−1) and high thermal stability; no phase separation was observed in the films.
    Dyes and Pigments 11/2008; 79(2):140-144. DOI:10.1016/j.dyepig.2008.01.016 · 3.47 Impact Factor
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    ABSTRACT: A poly-o-phenylenediamine and multi-wall carbon nanotubes composite (PoPD/MWNTs) modified glassy carbon electrode (GCE) was prepared by in situ electropolymerization using an ionic surfactant as the supporting electrolyte. The morphology of the resulting PoPD/MWNTs composite was characterized by TEM and the electrochemical properties of the modified electrode were characterized by cyclic voltammetry. The electrochemical behavior of calcium dobesilate on PoPD/MWNTs modified electrode was also investigated. The large current response of calcium dobesilate on PoPD/MWNTs modified electrode is probably caused by the synergistic effect of the electrocatalytic property of PoPD and MWNTs. The reductive peak current increased linearly with the concentration of calcium dobesilate in the range of 0.1-1.0 micromol/L and 4.0-400 micromol/L by square wave adsorptive stripping voltammetry, respectively. The detection limit (three times the signal blank/slope) was 0.035 micromol/L. The modified electrode could eliminate the interference of dopamine, norepinephrine and epinephrine at 100-, 90- and 70-fold concentration of 1.0 micromol/L calcium dobesilate, respectively. The proposed modified electrode provides a new promising and alternative way to detect calcium dobesilate.
    Journal of Biochemical and Biophysical Methods 05/2008; 70(6):1203-9. DOI:10.1016/j.jbbm.2007.10.002 · 1.81 Impact Factor
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    ABSTRACT: A novel organic–inorganic fluorescent material as chemosensor containing 2-substitute imidazole-[4,5-f]-1,10-phenanthroline derivative was prepared by sol–gel reaction, and the binding ability of hybrid material with metal ions was evaluated, and the results indicated that the hybrid material can selectively recognize Pb2+. By examining the ability of hybrid material to adsorb Pb2+ in solid liquid phase, 98.3% of Pb2+ was adsorbed onto the surface of hybrid material, and the hybrid material can be repeatedly utilized with suitable treatment, where the “off-on-off” process was due to the pH modulation of the phenanthroline ligand. The combination of well-defined inorganic matrix and functionalized organic receptor can play a pivotal role in the development of a novel generation of functionalized composites.
    Materials Letters 04/2008; 62(10):1514-1517. DOI:10.1016/j.matlet.2007.09.014 · 2.27 Impact Factor
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    ABSTRACT: Attempts were made to prepare monodispersed organic luminescent nanomaterials by a new procedure, in-situ emulsifier-free microemulsion copolymerization. Highly monodispersed organic luminescent nanomaterials were prepared, and the films were deposited onto solid substrates by spin coating. The diameters of nanomaterials ranged from 20 nm to 100 nm, which were controlled by surfactant. The organic luminescent molecular (VPDPI) was copolymerized with the main monomers and reactive surfactant, and the photoluminescent properties of the films were investigated. The results indicated that the films of organic luminescent nanomaterials were achieved by using the polymerizable luminescent material, and the emission peaks were slightly red shifted with increasing nanoparticle sizes due to exciton confinement.
    Materials Letters 03/2008; 62(6):1085-1088. DOI:10.1016/j.matlet.2007.07.054 · 2.27 Impact Factor
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    ABSTRACT: A series of novel imidazole derivatives as blue light emitting materials were synthesized by heck coupling reaction and characterized with respect to their chemical, luminescence and thermal properties. The results were shown that the imidazole derivatives were strongly blue fluorescent (λ=455–487nm) with high fluorescence quantum yields (Φf=0.28–0.63). All of these compounds have excellent thermal properties (382–423°C) due to the molecular structure introduced by imidazole heterocycles, and the imidazole derivatives (M1 and M2) can be polymerized as monomers.
    Materials Chemistry and Physics 02/2008; 107(2):305-309. DOI:10.1016/j.matchemphys.2007.07.014 · 2.13 Impact Factor
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    ABSTRACT: Biofunctionalization and manipulating of carbon nanotubes (CNTs) is important for biomedical research and application. Cy5 labeled goat anti-rabbit IgG (anti-IgG-Cy5) is chemically bonded to CNTs via a two-step process of diimide-activated amidation. This process can avoid the intermolecular connection of proteins. Fluorescent imaging of CNTs in aqueous solution has been demonstrated using anti-IgG-Cy5 immobilized CNTs (IgG-CNTs) as the model. The biologically functionalized carbon nanotubes (f-CNTs) in solution have been observed successfully using fluorescence microscopy. The fluorescent image of highly oriented f-CNTs is obtained at first time. The influencing factors on fluorescent imaging including oxidation duration, background noise and reactant concentration are discussed.
    Applied Surface Science 01/2008; 254(7-254):1915-1918. DOI:10.1016/j.apsusc.2007.07.189 · 2.54 Impact Factor
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    ABSTRACT: In this study poly(pentafluorostyrene)-ran-poly(4-vinylaniline) (PPFS-r-PVA) was synthesized by solution polymerization with AIBN utilized as an initiator. The dilute THF solution of the resultant copolymer was spin-coated onto clean Ag/Si(100) substrates, and then the copolymer film was electrically poled at 85 °C for 30 min using a plane poling method with a poling voltage of 7.0 kV. The pyroelectric coefficient was determined by a digital integral method and carried out with a charge integral instrument. It was observed that the average pyroelectric coefficient of the resultant PPFS-r-PVA was 20.4 µC/cm2K in the range of 20–45 °C, and the average dielectric loss is about 0.2298 between 3.2 × 104–1.0 × 106 Hz.
    Macromolecular Symposia 01/2008; 261(1):144-147. DOI:10.1002/masy.200850119
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    ABSTRACT: A novel imidazole derivative, 2-(4-(2,5-dibutoxy-4-vinylstyryl)phenyl)-4,5-diphenyl-1H-imidazole) (VPDPI), as optoelectronic material was designed and synthesized by heck coupling reaction. The structure, thermal analysis and photoluminescence (PL) properties were investigated. The results indicate that the organic compound has good PL property. The emission peak of VPDPI is in the blue regions (465 nm), and the luminescence quantum yield is 0.61 in ethanol, which show that the compound emits blue light and is a desirable blue-emitting photoluminescence material. Also the organic compound shows better thermal stability due to the molecular structure introduced by imidazole heterocyle. The compound can be polymerized for the design of novel and efficient organic optoelectronic materials.
    Materials Letters 10/2007; 61(26):4803-4806. DOI:10.1016/j.matlet.2007.03.038 · 2.27 Impact Factor

Publication Stats

218 Citations
54.94 Total Impact Points

Institutions

  • 2002–2015
    • Hubei University
      • • Key Laboratory of Synthesis and Application of Organic Functional Molecules of the Education Ministry
      • • Faculty of Chemistry and Material Science
      Wu-han-shih, Hubei, China