Xue Duan

Beijing University of Chemical Technology, Peping, Beijing, China

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Publications (303)1289.88 Total impact

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    ABSTRACT: A sophisticated hierarchical nanoarray consisting of a conducting polymer (polypyrrole, PPy) core and layered double hydroxide (LDH) shell are synthesized via a facile two-step electrosynthesis method. The obtained PPy@LDH-based flexible all-solid-state supercapacitor meets the requirements of both high energy/power output and long-term endurance, which can be potentially used in highly-efficient and stable energy storage. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Small 03/2015; DOI:10.1002/smll.201403421 · 7.51 Impact Factor
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    ABSTRACT: TiO2@CoAl-layered double hydroxide (LDH) core–shell nanospheres are fabricated via hydrothermal synthesis of TiO2 hollow nanospheres followed by in situ growth of CoAl-LDH shell, which exhibit an extraordinarily high photocatalytic activity toward oxygen evolution from water oxidation. The O2 generation rates of 2.34 and 2.24 mmol h−1 g−1 are achieved under full sunlight (>200 nm) and visible light (>420 nm), respectively, which are among the highest photocatalytic activities for oxygen production to date. The reason is attributed to the desirable incorporation of visible- light-active LDH shell with UV light-responsive TiO2 core for promoted solar energy utilization. Most importantly, the combined experimental results and computational simulations reveal that the strong donor–acceptor coupling and suitable band matching between TiO2 core and LDH shell facilitate the separation of photoinduced electron-hole pairs, accounting for the highly efficient photocatalytic performance. Therefore, this work provides a facile and cost-effective strategy for the design and fabrication of hierarchical semiconductor materials, which can be applied as photocatalyst toward water splitting and solar energy conversion.
    Advanced Functional Materials 02/2015; DOI:10.1002/adfm.201404496 · 10.44 Impact Factor
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    ABSTRACT: The selective hydrogenation of benzene to cyclohexene is of high value for the chemical industry owing to its inexpensive feedstock, atom economy, and operational simplicity. A tunable catalytic behavior towards the selective hydrogenation of benzene was obtained over Cu-decorated Ru catalysts supported on a layered double hydroxide (denoted as RuxCuy/MgAl-LDH), reaching a maximum cyclohexene yield of 44.0 % over Ru1.0Cu0.5/MgAl-LDH at 150 °C and 5.0 MPa without employment of any additives. CO-TPD (TPD=temperature-programmed desorption) and in situ CO-FTIR techniques demonstrated that Cu atoms preferentially deposit on the surface of low-coordinated Ru atoms in RuxCuy/MgAl-LDH catalysts, resulting in a low adsorption energy of cyclohexene on the modified sites as revealed by DFT calculations. This work not only gives an understanding of the correlation between the surface exposure of Ru active sites and the resulting selectivity, but also provides a green and additive-free catalytic process for the selective hydrogenation of benzene.
    ChemCatChem 01/2015; 7(5). DOI:10.1002/cctc.201402895 · 5.18 Impact Factor
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    ABSTRACT: Au nanoparticles sensitized ZnO nanorod@nanoplatelet (NR@NP) core-shell arrays have been synthesized via a facile hydrothermal method followed by a further modification using Au nanoparticles. The resulting Au-ZnO NR@NP nanoarray exhibits promising behavior in photoelectrochemical (PEC) water splitting, giving rise to a largely enhanced photocurrent density, photoconversion efficiency as well as incident-photon-to-current-conversion efficiency (IPCE), much superior to those of pristine ZnO nanorods arrays and ZnO NR@NP. This is attributed to the coordination of ZnO core-shell hierarchical nanostructure and the surface-plasmon-resonance effect of Au nanoparticles, which facilitates the exposure of active sites and utilization of visible light. Density functional theory (DFT) calculations further confirm that the photogenerated electrons of ZnO transfer to Au, which suppresses the recombination of electron–hole pairs. Therefore, this work provides a facile and cost-effective strategy for the construction of hierarchical metal/semiconductor nanoarrays, which can be potentially used in the field of energy storage and conversion.
    Nano Energy 01/2015; 12. DOI:10.1016/j.nanoen.2014.12.037 · 10.21 Impact Factor
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    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; DOI:10.1039/C4GC01633E · 6.85 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; 50(95). DOI:10.1039/C4CC07628A · 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; 46(7). DOI:10.1002/smll.201401464 · 7.51 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; 43(20). DOI:10.1039/c4cs00160e · 30.43 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; 7. DOI:10.1016/j.nanoen.2014.05.002 · 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; 50(91). DOI:10.1039/c4cc03118k · 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.
    06/2014; 2(26). DOI:10.1039/C4TC00755G
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    ABSTRACT: Water as a green solvent has attracted considerable research interests in many important organic reactions. Development of effective and recyclable water-tolerant catalysts, especially heterogeneous catalysts, is the main challenge for the catalytic reactions in aqueous medium. Layered double hydroxides (LDHs) are a class of anion clays consisting of brucite-like host layers and interlayer anions, with versatility in composition, morphology and architecture. By virtue of the hydrophilicity of the hydroxyl-riched host layers as well as the 2D confined region of interlayer gallery, LDHs display great potential as supports to immobilize catalytically-active species so as to obtain water-compatible heterogeneous catalysts, in which catalytic sites can be preferentially orientated, highly dispersed, and firmly stabilized to afford excellent catalytic performance and recyclability in aqueous medium. Moreover, LDHs can be used as precursors for the preparation of hydrophilic metal or metal oxides catalysts based on the unique topotactic process transformation. In this Overview Article, we will summarize the latest developments in the design and preparation of LDHs-based heterogeneous catalysts in green aqueous media.
    Catalysis Today 06/2014; 247. DOI:10.1016/j.cattod.2014.05.032 · 3.31 Impact Factor
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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 05/2014; 50(54). DOI:10.1039/c4cc01970a · 6.72 Impact Factor
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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; DOI:10.1039/c4cc01625d · 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; 24(20). DOI:10.1002/adfm.201303638 · 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.
    04/2014; 2(20). DOI:10.1039/C4TA00023D
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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. DOI:10.1021/cm404218y · 8.54 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 03/2014; 6(3). DOI:10.1002/cctc.201300813 · 5.04 Impact Factor
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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). DOI:10.1039/C3GC41939H · 6.85 Impact Factor
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    ABSTRACT: Layered intercalated functional materials of layered double hydroxide type are an important class of functional materials developed in recent years. Based on long term studies on these materials in the State Key Laboratory of Chemical Resource Engineering in Beijing University of Chemical Technology, the principle for the design of controlled intercalation processes in the light of future production processing requirements has been developed. Intercalation assembly methods and technologies have been invented to control the intercalation process for preparing layered intercalated materials with various structures and functions.
    ChemInform 02/2014; 45(7). DOI:10.1002/chin.201407243

Publication Stats

6k Citations
1,289.88 Total Impact Points

Institutions

  • 2000–2015
    • Beijing University of Chemical Technology
      • College of Materials Science and Engineering (SMSE)
      Peping, Beijing, China
  • 2014
    • Green Chem
      Bengalūru, Karnataka, India
  • 2011
    • University of Cambridge
      • Department of Chemistry
      Cambridge, ENG, United Kingdom
  • 2010
    • Tianjin University
      T’ien-ching-shih, Tianjin Shi, China
  • 2006
    • Chinese Academy of Sciences
      • Institute of Chemistry
      Peping, Beijing, China
  • 2005
    • Sichuan University
      • Department of Chemistry
      Hua-yang, Sichuan, China
    • University of Science and Technology, Beijing
      • School of Materials Science and Engineering
      Beijing, Beijing Shi, China
  • 2004–2005
    • National Tsing Hua University
      • Department of Chemistry
      Hsin-chu-hsien, Taiwan, Taiwan
    • Peking University
      • State Key Laboratory for Structural Chemistry of Unstable and Stable Species
      Peping, Beijing, China
    • Jilin University
      • State Key Laboratory of Supramolecular Structure and Materials
      Yung-chi, Jilin Sheng, China
  • 2003
    • Beijing University of Aeronautics and Astronautics (Beihang University)
      Peping, Beijing, China