Xue Duan

Beijing University of Chemical Technology, Peping, Beijing, China

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Publications (295)951.76 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Production of higher alcohols from the catalytic conversion of synthesis gas (CO + H2) is one of the most promising approaches for the utilization of nonoil resources, in which bimetallic catalysts based on Cu and Fischer–Tropsch (FT) reaction active elements (e.g., Co, Fe, Ni) are efficient and cost-effective candidates. Herein, we demonstrate the fabrication of core−shell Cu@(CuCo-alloy) nanoparticles (NPs) embedded on a Al2O3 matrix via an in situ growth of CuCoAl-LDHs nanoplatelets on aluminum substrates followed by a calcination-reduction process, which serve as an efficient catalyst toward CO hydrogenation to produce higher alcohols. The composition, particle size and shell thickness can be tuned by changing the Cu/Co molar ratio in the LDHs precursors, and the best catalytic behavior was obtained over the Cu/Co (1/2) catalyst with a CO conversion of 21.5% and a selectivity (C6+ slate 1-alcohols) of 48.9%, which is superior to the traditional modified FT catalysts. The XPS, in situ FTIR spectroscopy and HAADF-STEM reveal that the unique electronic and geometric interaction between Cu and Co in the Cu@(CuCo-alloy) NPs give contribution to the significantly enhanced catalytic performances. In addition, the 3D hierachical structure of Cu@(CuCo-alloy)/Al2O3 catalyst facilitates the mass diffusion/transportation as well as prevents the hotspot formation, accounting for its stability and recycleability. The Cu@(CuCo-alloy)/Al2O3 catalyst with significantly improved catalytic behavior can be potentially used in CO hydrogenation to produce higher alcohols.
    Green Chemistry 12/2014; · 6.83 Impact Factor
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    ABSTRACT: A targeted photosensitizer used in photodynamic therapy (PDT) was fabricated by incorporation of zinc phthalocyanine (ZnPc) and folic acid (FA) into polyvinylpyrrolidone (PVP) micelle, which exhibits excellent anticancer performance both in vitro studies and in vivo tests.
    Chemical Communications 10/2014; · 6.38 Impact Factor
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    ABSTRACT: Layered double hydroxides (LDHs) are a class of anion clays consisting of brucite-like host layers and interlayer anions, which have attracted increasing interest in the fields of catalysis/adsorption. By virtue of the versatility in composition, morphology, and architecture of LDH materials, as well as their unique structural properties (intercalation, topological transformation, and self-assembly with other functional materials), LDHs display great potential in the design and fabrication of nanomaterials applied in photocatalysis, heterogeneous catalysis, and adsorption/separation processes. Taking advantage of the structural merits and various control synthesis strategies of LDHs, the active center structure (e.g., crystal facets, defects, geometric and electronic states, etc.) and macro–nano morphology can be facilely manipulated for specific catalytic/adsorbent processes with largely enhanced performances. In this review, the latest advancements in the design and preparation of LDH-based functional nanomaterials for sustainable development in catalysis and adsorption are summarized.
    Small 08/2014; · 7.82 Impact Factor
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    ABSTRACT: This review surveys recent advances in the applications of layered double hydroxides (LDHs) in heterogeneous catalysis. By virtue of the flexible tunability and uniform distribution of metal cations in the brucite-like layers and the facile exchangeability of intercalated anions, LDHs-both as directly prepared or after thermal treatment and/or reduction-have found many applications as stable and recyclable heterogeneous catalysts or catalyst supports for a variety of reactions with high industrial and academic importance. A major challenge in this rapidly growing field is to simultaneously improve the activity, selectivity and stability of these LDH-based materials by developing ways of tailoring the electronic structure of the catalysts and supports. Therefore, this Review article is mainly focused on the most recent developments in smart design strategies for LDH materials and the potential catalytic applications of the resulting materials.
    Chemical Society Reviews 07/2014; · 24.89 Impact Factor
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    ABSTRACT: Co3O4@NiAl-layered double hydroxide (LDH) core/shell nanowire arrays have been fabricated by in situ growth of LDH nanosheets shell on the surface of Co3O4 core. The resulting Co3O4@NiAl-LDH material exhibits promising supercatacitance performance including largely enhanced specific capacitance and rate capability compared with pristine Co3O4 nanowire arrays. This can be attributed to the sufficient exposure of electroactive species and the enhanced charge transportation process resulting from the hierarchical structure.
    Nano Energy 07/2014; · 10.21 Impact Factor
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    ABSTRACT: Inorganic nanomaterials including gold nanoparticles, mesoporous silica nanoparticles, graphene, magnetic nanoparticles, quantum dots and layered double hydroxides have become one of the most active research fields in biochemistry, biotechnology and biomedicine. Benefiting from the facile synthesis/modification, intrinsically physicochemical properties and good biocompatibility, inorganic nanomaterials have shown great potential in bioimaging, targeted drug delivery and cancer therapies. This Feature Article summarizes recent progress on various inorganic nanocarriers, including the background, synthesis, modification, cytotoxicity, physicochemical properties as well as their applications in biomedicine.
    Chemical Communications 06/2014; · 6.38 Impact Factor
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    ABSTRACT: Fluorescence sensing of nucleotides is an important topic for biosensor and fluorescence materials. In this paper, a cheap UV light absorber, 2-phenylbenzimidazole-5-sulfonate (PBS) was immobilized into the interlayers of Zn2Al layered double hydroxides (LDHs) by co-intercalating with 1-decane sulfonate (DES) anions. The dependence of fluorescence on the molar concentration (x%) of PBS was investigated, and the PBS(15%)–DES/LDH composite exhibited optimal violet luminescence at 402 nm, compared with that of the PBS solution with luminescence at 342 nm. The PBS(15%)–DES/LDH composite thin films were fabricated by solvent evaporation method on quartz substrate. Moreover, the composite thin film exhibited remarkable PBS luminescence transformation (violet to UV light) for nucleotide triphosphates (ATP, GTP, CTP and UTP), compared with their diphosphate and monophosphate counterparts (ADP, AMP and etc.), which makes it a prospective sensor for the nucleotide molecules at the simulated physiological conditions. The origin of the luminescence enhancement was investigated and attributed to the extensive hydrogen bonding interaction between the intercalated PBS and nucleotides.
    J. Mater. Chem. C. 06/2014; 2(26).
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    ABSTRACT: Hybrid films were fabricated via layer-by-layer assembly of layered double hydroxide (LDH) nanoplatelets and poly(sodium styrene-4-sulfonate) (PSS) followed by subsequent permeation of poly(vinyl alcohol) (PVA), which show excellent oxygen barrier performance with humidity-triggered self-healing capability.
    Chemical communications (Cambridge, England). 05/2014;
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    ABSTRACT: Fabricating active materials into specific macrostructures is critical in the pursuit of high electro-catalytic activity. Herein we demonstrate that a three-dimensional (3D) architecture of NiFe layered double hydroxide (NiFe-LDH) significantly reduced the onset potential, yielded high current density at small overpotentials, and showed outstanding stability in electrochemical oxygen evolution reaction.
    Chemical Communications 05/2014; · 6.38 Impact Factor
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    ABSTRACT: A hierarchical nanostructure composed of NiMn-layered double hydroxide (NiMn-LDH) microcrystals grafted on carbon nanotube (CNT) backbone is constructed by an in situ growth route, which exhibits superior supercapacitive performance. The resulting composite material (NiMn-LDH/CNT) displays a three-dimensional architecture with tunable Ni/Mn ratio, well-defined core-shell configuration, and enlarged surface area. An electrochemical investigation shows that the Ni3Mn1-LDH/CNT electrode is rather active, which delivers a maximum specific capacitance of 2960 F g–1 (at 1.5 A g–1), excellent rate capability (79.5% retention at 30 A g–1), and cyclic stability. Moreover, an all-solid-state asymmetric supercapacitor (SC) with good flexibility is fabricated by using the NiMn-LDH/CNT film and reduced graphene oxide (RGO)/CNT film as the positive and negative electrode, respectively, exhibiting a wide cell voltage of 1.7 V and largely enhanced energy density up to 88.3 Wh kg–1 (based on the total weight of the device). By virtue of the high-capacity of pseudocapacitive hydroxides and desirable conductivity of carbon-based materials, the monolithic design demonstrated in this work provides a promising approach for the development of flexible energy storage systems.
    Advanced Functional Materials 05/2014; · 10.44 Impact Factor
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    ABSTRACT: How to control the size and morphology of metal nanocatalysts is of vital importance in enhancing their catalytic performance. In this work, uniform and ultrafine Ru–B amorphous alloy nanoparticles (NPs) supported on titanate nanosheets were fabricated via a confined synthesis in titanate nanotubes (TNTs) followed by unwrapping the tube to sheetlike titanate (TNS) (denoted as Ru–B/TNS), which exhibit excellent catalytic performance toward the selective hydrogenation of benzene to cyclohexene (yieldcyclohexene: 50.7%) without any additives. HRTEM images show the resulting Ru–B NPs are highly dispersed on the titanate nanosheets (particle size: 2.5 nm), with a low Ru–Ru coordination number revealed by EXAFS. Moreover, XPS demonstrates the surface-enriched B element and a strong electron transfer from B to Ru, which facilitates the formation and desorption of cyclohexene on the Ru active-sites, accounting for the significantly enhanced catalytic behavior. The surfactant-free confined synthesis and additive-free catalytic system make the Ru–B/TNS catalyst a promising candidate for the selective hydrogenation of benzene.
    J. Mater. Chem. A. 04/2014; 2(20).
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    ABSTRACT: Flexible luminescent materials, with the advantages of foldability and crack resistance, have attracted extensive interest owing to their broad application in collapsible optoelectronic devices. In this work, highly luminescent and flexible films were fabricated via self-assembly of triple building blocks: layered double hydroxide (LDH) nanoplatelets, polyvinyl alcohol (PVA), and quantum dots (QDs: CdTe or CdSe/ZnS), which show 2D ordered structure and finely tunable fluorescence (green, yellow, orange, and red). The resulting films display rather strong fluorescence and high fluorescence quantum yield (PLQY), which can be attributed to the uniform dispersion of QDs within the inorganic–organic hybrid matrix. Furthermore, we incorporated the red-emitting LDH/(PVA-CdSe/ZnS) film with the commercialized white light-emitting diodes (WLED) and obtained significantly improved color-rendering property through modifying its spectral distribution. In addition, the LDH/PVA-QDs films display high photo- and thermostability. Therefore, this work provides a facile approach for the design and fabrication of clay–polymer–QDs hybrid luminescent films with exceptional light emission, flexibility, and stability, which can serve as promising materials for the integration of WLED illumination devices.
    Chemistry of Materials. 04/2014; 26(8):2595–2600.
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    ABSTRACT: Hydrogen represents an important alternative energy feedstock for both environmental and economic reasons. Development of highly selective, efficient and economical catalysts towards H2 generation from hydrogen storage materials (e.g., hydrous hydrazine, N2H4·H2O) has been one of the most active research areas. In this work, a bifunctional NiFe-alloy/MgO catalyst containing both an active center and a solid base center was obtained via a calcination–reduction process of NiFeMg-layered double hydroxides (LDHs) precursor, which exhibits 100% conversion of N2H4·H2O and up to 99% selectivity towards H2 generation at room temperature, comparable to the most reported noble metal catalysts (e.g., Rh, Pt). The XRD, HRTEM and HAADF-STEM results confirm that well-dispersed NiFe alloy nanoparticles (NPs) with diameters of 22 nm were embedded in a thermally stable MgO matrix. The EXAFS verifies the electronic interaction between nickel and iron elements in NiFe alloy NPs, accounting for the significantly enhanced low-temperature activity. The CO2-TPD results indicate that the strong basic sites on the surface of the NiFe-alloy/MgO catalyst contribute to the high H2 selectivity.
    Green Chemistry 02/2014; 16(3). · 6.83 Impact Factor
  • ChemInform 02/2014; 45(7).
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    ABSTRACT: Density functional theory (DFT) calculations were carried out to study the nucleation and growth mechanism of Ru clusters on the TiO2(101) surface by using supported Run (n = 1–10, 20, 22) cluster models to understand the metal–support interaction and the resulting catalytic performance toward CO oxidation. The results show that the Run cluster prefers a 3D geometry when n ≥ 4 and that the Ru–TiO2 interface is predominantly composed of Ru–O and Ti–O bonds. Calculation studies based on the density of states (DOS), Hirshfeld charge analysis, and electron deformation density (EDD) demonstrate that the electronic interaction is mainly localized at the Ru–TiO2 interface through the electron transfer via the Ru–O bond. Additionally, the investigation on catalytic behavior of Run/TiO2 toward CO oxidation reveals the largely enhanced catalytic activity of the supported Run clusters, which originates from the significant reduction of the activation barrier as a result of the electron transfer from Ru to TiO2.
    The Journal of Physical Chemistry C. 02/2014; 118(7):3514–3522.
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    ABSTRACT: A supermolecular photosensitizer with excellent anticancer behavior when used for photodynamic therapy (PDT) is fabricated by the incorporation of zinc phthalocyanines (ZnPc) into the gallery of a layered double hydroxide (LDH). The composite material possesses uniform particle size (hydrodynamic diameter ∼120 nm), and the host–guest and guest–guest interactions result in a high dispersion of ZnPc in a monomeric state in the interlayer region of the LDH matrix, with high singlet oxygen production efficiency. In vitro tests performed with HepG2 cells reveal a satisfactory PDT effectiveness of the ZnPc(1.5%)/LDH composite photosensitizer: a cellular damage as high as 85.7% is achieved with a rather low dosage of ZnPc (10 μg/mL). An extraordinarily high specific efficacy is demonstrated (31.59 μg−1 (J/cm2)−1), which is over 185.5% enhancement compared with the previously reported photosensitizers under similar test conditions. Furthermore, an in vivo study of the ZnPc(1.5%)/LDH demonstrates excellent PDT performance with an ultra-low dose (0.3 mg/kg) and a low optical fluence rate (54 J/cm2). In addition, the ZnPc/LDH photosensitizer displays high stability, good biocompatibility, and low cytotoxicity, which would guarantee its practical application. Therefore, this work provides a facile approach for design and fabrication of inorganic–organic supermolecular materials with greatly enhanced anticancer behavior.
    Advanced Functional Materials 02/2014; · 10.44 Impact Factor
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    ABSTRACT: Well‐aligned hierarchical nanoarrays containing ZnO core and layered double hydroxide (LDH) nanoplatelets shell have been synthesized via a facile electrosynthesis method. The resulting ZnO@CoNi–LDH core−shell nanoarray exhibits promising behavior in photoelectrochemical water splitting, giving rise to a largely enhanced photocurrent density as well as stability; much superior to those of ZnO‐based photoelectrodes. This is attributed to the successful integration of photogenerated electron–hole separation originating from the ZnO core and the excellent electrocatalytic activity of LDH shell. This work provides a facile and cost‐effective strategy for the fabrication of multifunctional nanoarrays with a hierarchical structure, which can be potentially used in energy storage and conversion devices. Hierarchical nanowire arrays based on a semiconductor core–layered double hydroxide shell are synthesized via a facile and cost‐effective electrosynthesis method. The resulting core–shell ZnO@LDH NW array exhibits largely enhanced efficiency in photoelectrochemical watersplitting, including a large photocurrent and high stability, as a result of the significantly improved photogenerated carrier transfer and increased reaction kinetics of water splitting.
    Advanced Functional Materials 02/2014; 24(5). · 10.44 Impact Factor
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    ABSTRACT: Transparent and flexible multilayer films are fabricated based on the alternating assembly of cellulose acetate (CA) and layered double hydroxide (LDH) nanoplatelets followed by thermal annealing treatment. The films exhibit tremendously enhanced oxygen barrier properties. The oxygen transmission rate (OTR) of the resulting (CA/LDH) n multilayer films can be tuned by changing the aspect ratio of high‐crystalline LDH nanoplatelets from 20 to 560. The (CA/LDH)20 film displays excellent oxygen‐barrier behavior with an OTR equal to or below the detection limit of commercial instrumentation (3 m−2 day−1), much superior to the previously reported inorganic flake‐filled barrier film. Molecular dynamics simulations reveal that a hydrogen bonding network occurs at the interface of highly oriented LDH nanoplatelets and CA molecules, accounting for the suppression of oxygen transportation and the resulting largely improved barrier behavior. In addition, the durability of (CA/LDH) n films against humidity, temperature, and light irradiation is successfully demonstrated, which would guarantee their practical application. Therefore, this work provides a facile and cost‐effective strategy for the fabrication of an LDH‐based oxygen barrier material, which could potentially be used in flexible displays and drug and food packaging. Transparent, flexible films with excellent oxygen barrier behavior are fabricated by spin‐coating of cellulose acetate (CA) and layered double hydroxide (LDH) nanoplatelets alternately, followed by thermal annealing treatment. The resulting (CA/LDH)20 film exhibits extraordinarily enhanced oxygene barrier property, superior to the previously reported inorganic‐filled films.
    Advanced Functional Materials 01/2014; 24(4). · 10.44 Impact Factor
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    ABSTRACT: The chemoselective hydrogenation of alkyne is of great importance in the chemical industry, in which intermetallic compounds (IMCs) have attracted extensive interest as efficient catalysts. Herein, we demonstrate the preparation of several supported Ni–Ga IMCs (Ni3Ga, Ni5Ga3, and NiGa) via a facile in situ reduction of layered double hydroxide (LDH) precursors, which demonstrate significantly improved catalytic activity and selectivity for the selective hydrogenation of phenylacetylene to styrene. The composition and particle size of Ni–Ga IMCs can be tuned by adjusting the Ni/Ga ratio or reduction temperature during the topotactic transformation process of LDHs, and the best catalytic behavior can be obtained over the Ni3Ga IMC with a styrene yield of 87.7 % (particle size=7.2 nm at 40 °C and 0.3 MPa), which is better than that of most of the reported Ni catalysts. The X‐ray absorption fine‐structure characterization and DFT calculations reveal the electron transfer from Ga to Ni and active‐site isolation by Ga in Ni–Ga IMCs, which account for the excellent hydrogenation selectivity. The significantly improved catalytic performance makes Ni–Ga IMC catalysts promising candidates for the selective hydrogenation of alkyne. The effect of isolation: Well‐dispersed Ni–Ga intermetallic compounds with tunable particle size demonstrate excellent catalytic behavior in the selective hydrogenation of phenylacetylene to styrene. X‐ray absorption fine‐structure characterization and DFT calculations reveal the electron transfer and active‐site isolation effect in the Ni–Ga intermetallic compounds (IMCs), accounting for the enhanced hydrogenation selectivity.
    ChemCatChem 01/2014; 6(3). · 5.18 Impact Factor
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    ABSTRACT: Narrow size dispersion ZnTi–layered double hydroxide (LDH) nanosheets with lateral dimensions in the range 40–80 nm have been synthesised using a reverse microemulsion method. Electron Spin Resonance (ESR) and X-ray photoelectron spectroscopy (XPS) measurements reveal that Ti3+ sites are generated within these nanosized LDH platelets. The data show that the concentration of Ti3+ cations in the nanoplatelets is size-dependent, the 40 nm nanoplatelets have a bandgap of ca. 2.3 eV. The combination of photochemcially activity and nanoparticle size results in materials that exhibit high antipathogen activity under visible light. The biocidal efficacies of the LDHs have been investigated under visible light. The ZnTi–LDHs display size-dependent cytotoxicity against S. cerevisiae, S. aureus and E. coli in culture. The 40 nm ZnTi–LDH nanoplatelets (ZnTi–LDH–RM1) are the most potent resulting in 95% cell death. These nanoplatelets are more active compared to a conventionally prepared ZnTi–LDH or the nanoparticulate metal oxides WO3 and TiO2 (P25). The nanosized ZnTi–LDHs severely inhibit the growth of S. cerevisiae, S. aureus and E. coli in culture.
    J. Mater. Chem. B. 11/2013; 1(43).

Publication Stats

2k Citations
951.76 Total Impact Points


  • 1970–2014
    • Beijing University of Chemical Technology
      • College of Materials Science and Engineering (SMSE)
      Peping, Beijing, China
  • 2011
    • University of Cambridge
      • Department of Chemistry
      Cambridge, ENG, United Kingdom
  • 2010
    • Nanjing University
      • Department of Chemical Engineering
      Nanjing, Jiangsu Sheng, China
  • 2007–2010
    • Tianjin University
      T’ien-ching-shih, Tianjin Shi, China
  • 2008
    • Georgia Institute of Technology
      • School of Materials Science and Engineering
      Atlanta, Georgia, United States
  • 2005
    • University of Science and Technology, Beijing
      • School of Materials Science and Engineering
      Beijing, Beijing Shi, China
  • 2004
    • Tsinghua University
      • Department of Chemistry
      Beijing, Beijing Shi, China
    • Peking University
      • State Key Laboratory for Structural Chemistry of Unstable and Stable Species
      Peping, Beijing, China