Cheng-Yong Su

Sun Yat-Sen University, Shengcheng, Guangdong, China

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Publications (291)1350.67 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Four novel thiocyanate-free cyclometallted Ru(II) complexes, D-bisCF3, D-CF3, D-OMe, and D-DPA, with two 4,4′-dicarboxylic acid-2,2′-bipyridine together with a functionalized phenylpyridine ancillary ligand, have been designed and synthesized. The effect of different substituents (R = bisCF3, CF3, OMe, and DPA) on the ancillary C^N ligand on the photophysical properties and photovoltaic performance is investigated. Under standard global AM 1.5 solar conditions, the device based on D-CF3 sensitizer gives a higher conversion efficiency of 8.74% than those based on D-bisCF3, D-OMe, and D-DPA, which can be ascribed to its broad range of visible light absorption, appropriate localization of the frontier orbitals, weak hydrogen bonds between -CF3 and -OH groups at the TiO2 surface, moderate dye loading on TiO2, and high charge collection efficiency. Moreover, the D-bisCF3 and D-CF3 based DSSCs exhibit good stability under 100 mW cm−2 light soaking at 60 °C for 400 h.
    Electrochimica Acta 06/2015; 174. DOI:10.1016/j.electacta.2015.06.023 · 4.50 Impact Factor
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    ABSTRACT: Four Ru(ii)/Ir(iii) metalloligands have been designed and synthesized from polypyridine and bibenzimidazole (BiBzIm) organic ligands, which show strong visible light absorption via metal-to-ligand charge transfer (MLCT) transitions. Nd/Yb(iii) complexes were further assembled from these Ru(ii)/Ir(iii) metalloligands, and Ln(iii)-centered NIR emissions can be efficiently sensitized by (3)MLCT states of the metalloligands in the visible-light region. The energy transfer rates for the complexes are generally in the order Nd > Yb, which is due to the better matching between (3)MLCT states of Ru(ii)/Ir(iii) metalloligands and densely distributed excited states of Nd(iii) ions. Long decayed lifetimes on a μs scale and high quantum yields up to 1% are obtained in these lanthanide complexes, suggesting that the Ru(ii)/Ir(iii) metalloligands can serve as a good visible light harvesting antenna to efficiently sensitize Ln(iii)-based NIR luminescence.
    Dalton Transactions 04/2015; DOI:10.1039/c5dt00545k · 4.10 Impact Factor
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    ABSTRACT: Creating cavities in varying levels, from molecular containers to macroscopic materials of porosity, have long been motivated for biomimetic or practical applications. Herein, we report an assembly approach to multiresponsive supramolecular gels by integrating photochromic metal-organic cages as predefined building units into the supramolecular gel skeleton, providing a new approach to create cavities in gels. Formation of discrete O-Pd2 L4 cages is driven by coordination between Pd(2+) and a photochromic dithienylethene bispyridine ligand (O-PyFDTE). In the presence of suitable solvents (DMSO or MeCN/DMSO), the O-Pd2 L4 cage molecules aggregate to form nanoparticles, which are further interconnected through supramolecular interactions to form a three-dimensional (3D) gel matrix to trap a large amount of solvent molecules. Light-induced phase and structural transformations readily occur owing to the reversible photochromic open-ring/closed-ring isomeric conversion of the cage units upon UV/visible light radiation. Furthermore, such Pd2 L4 cage-based gels show multiple reversible gel-solution transitions when thermal-, photo-, or mechanical stimuli are applied. Such supramolecular gels consisting of porous molecules may be developed as a new type of porous materials with different features from porous solids. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Chemistry - A European Journal 04/2015; 21(20). DOI:10.1002/chem.201406517 · 5.70 Impact Factor
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    ABSTRACT: Multicolored photoluminescence tuning in a single-phase material has invaluable potential in display and security applications. By deliberate design of a multifunctional antenna ligand and precise control of mixed metal ionic compositions in lanthanide metal-organic frameworks (Ln-MOFs), we achieved dichromatic fine-tuning among red, green, or blue primary colors through growth of a series of isomorphous Ln-MOF crystals·solvents of formula [LnnLn'1-n(TTP)2·H2O]Cl3 (Ln = Ln' = Eu, Tb, and Gd, 1-3; Ln = Eu, Ln' = Tb, 4-8; Ln = Gd, Ln' = Eu, 9-11; Ln = Gd, Ln' = Tb, 12-14; 0 < n < 1; TTP = 1',1″-(2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene)tris(pyridine-4(1H)-one)). The linear dependence of the emissions were analyzed, and the mathematical matrix models were established, which are useful to control the synthetic conditions and to predict the color chromaticity coordinates under varied excitation wavelengths. The potential relevance of these multicolored photoluminescent Ln-MOFs to barcoded materials was demonstrated.
    Inorganic Chemistry 03/2015; 54(12). DOI:10.1021/acs.inorgchem.5b00271 · 4.79 Impact Factor
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    ABSTRACT: Four novel D-D-pi-A type organic dyes (DWH1-DWH4) were designed and synthesized, in which 3,6-bis(thiophene or hexylthiophene)-disubstituted carbazole moieties were used as the electron donor, bithiophene units or their derivatives as the pi-conjugated bridge, and a cyanoacrylic acid group as the electron acceptor. The photovoltaic performance data indicate that the tuning of the J(sc) and V-oc values can be conveniently accomplished by incorporation of long alkyl chains into sensitizer, which not only improves the molar extinction coefficients of the absorption and enhances the solubility but also increases the electron lifetime by leading to an effective spatial separation of the charges.
    Dyes and Pigments 03/2015; 114:18-23. DOI:10.1016/j.dyepig.2014.10.022 · 3.47 Impact Factor
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    ABSTRACT: The development of novel nanoarray photoanode with heterostructure on transparent conducting oxide (TCO) substrate provides a promising scheme to fabricate efficient energy conversion devices. Herein, we successfully synthesize the vertically aligned hierarchical TiO2 nanowire/ZnO nanorod or TiO2 nanowire/ZnO nanosheet hybrid arrays which are proved to be an excellent anode candidate for superior light utilization. Consequently, the quantum dot-sensitized solar cells (QDSSCs) based on such hybrid arrays exhibit an impressive power conversion efficiency (PCE) under AM 1.5G one sun illumination with improved short-circuit current density (JSC) and fill factor (FF) compared to pristine TiO2 nanowire arrays. Combined with the chemical bath deposited Cu2S counter electrode, the eventual PCE can be further optimized to as high as 4.57% for CdS/CdSe co-sensitized quantum dot solar cells.
    ACS Applied Materials & Interfaces 02/2015; 7(9). DOI:10.1021/am507983y · 5.90 Impact Factor
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    ABSTRACT: Reactions of Cu(II), Cd(II), and Ni(II) with a new tetradentate ligand N1,N3-bis(1-(1H-benzimidazol-2-yl)ethylidene)propane-1,3-diamine (H2bbepd) afforded four mononuclear pincer-like complexes of [Cu(H2bbepd)(ClO4)]·CH3OH·ClO4 (1), [Cd(H2bbepd)(CH3OH)(ClO4)]·CH3OH·ClO4 (2), [Ni(H2bbepd)(H2O)2]·2ClO4 (3), and [Ni(H2bbepd)(NO3)2] (4), respectively. The labile small coordinated components (anions or solvent molecules) on the apical coordination site of metal ions in complexes 1-4 display three different modes, which can be substituted by 4,4′-bipyridine (bpy) to obtain four new multinuclear complexes of [Cu2(H2bbepd)2(bpy)]2·4ClO4 (5), [Cd4(H2bbepd)4(bpy)3(ClO4)2]·6ClO4·(bpy)·2CH3OH·6H2O (6), {[Ni(H2bbepd)(bpy)]·2ClO4·CH3OH}n (7), and {[Ni (H2bbepd)(bpy)]·2NO3·CH3OH·H2O}n (8), respectively. Complex 5 is a binuclear dumbbell-like molecule, complex 6 is a rare example of discrete linear tetranuclear molecule, while complexes 7 and 8 are one-dimensional chains formed by an alternate arrangement of bpy molecules and mononuclear subunits. The differences in complexes 5-8 are largely dependent on the structure of the mononuclear precusors of complexes 1-4. All eight complexes are assembled into higher dimensional supramolecular frameworks by diverse nonconvalent interactions including unusual anion···π interactions between perchlorate and five-membered benzimidazole rings.
    Crystal Growth & Design 02/2015; 15(2):625-634. DOI:10.1021/cg501306n · 4.56 Impact Factor
  • Mei Pan, Cheng-Yong Su
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    ABSTRACT: Review: recent advances in the assembly of coordination supramolecular structures showng Borromean-linking topological character; 46 refs.
    ChemInform 02/2015; 46(8):no-no. DOI:10.1002/chin.201508299
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    ABSTRACT: The development of an effective anode material with hierarchical multi-dimensional architecture is conducive to further improve the cell performance of photovoltaic devices. Herein we introduce an intriguing three-dimensional (3D) hierarchically branched hollow sphere-nanowire hybrid TiO2 photoanode for promising CdS and CdSe quantum dots co-sensitized solar cells application. The demonstrated 3D hierarchically hybrid photoanode owns a considerably high specific surface area while maintaining roomy space and providing ample porosity for efficient electrolyte infiltration. Moreover, the outstanding light scattering ability of such multi-dimensional architecture leads to an enhancement of light utilization efficiency and thus significantly enhanced short-circuit photocurrent. The control over the pore size of TiO2 hollow spheres and the optimizations on the newly developed chemical bath deposited (CBD) cuprous sulfide (Cu2S)/FTO counter electrode eventually yields power conversion efficiency as high as 6.01% for CdS/CdSe based quantum dot-sensitized solar cells (QDSSCs).
    Nano Energy 01/2015; 11:621-630. DOI:10.1016/j.nanoen.2014.11.045 · 10.21 Impact Factor
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    ChemSusChem 01/2015; 8(2):195-195. DOI:10.1002/cssc.201403047 · 7.12 Impact Factor
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    ABSTRACT: A porous imidazolium polymeric network was synthesized via alkylation of tetrakis-[4-(1H-imidazole-1-yl)phenyl]methane with 1,4-bis(bromomethyl)benzene. Its complexation with palladium yielded a Pd-NHC porous polymeric network, namely Pd-pNHC. Pd-pNHC showed selective uptake of CO2 over N-2 due to its polar surface. Pd-pNHC has a BET specific surface area of 308 m(2) g(-1) and a micropore volume of 0.190 cm(3) g(-1). Pd-pNHC showed ability to absorb both hydrophilic and aromatic guests (MeOH, EtOH and benzene). Pd(II) catalytically active centers within the porous polymeric network were readily accessible to substrates as demonstrated in Suzuki-Miyaura coupling reactions. High yields were achieved in the coupling reactions of various arylbromides under mild conditions. Additionally, Pd-pNHC catalyzed the reactions in a heterogeneous way and the catalyst could be used for at least ten times without loss of activity.
    Journal of Molecular Catalysis A Chemical 11/2014; 394:33–39. DOI:10.1016/j.molcata.2014.06.039 · 3.68 Impact Factor
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    ABSTRACT: The high-performance of a well-aligned 1D nanostructured electrode relies largely on a smart and rational modification with other active nanomaterials. Herein we present a facile solution-based route to fabricate a well-aligned metal oxides-based core-shell hybrid arrays on TCO substrate. Demonstrated samples included nanowire@nanoparticle (TNW@NP) or nanowire@nanosheet (TNW@NS) with a unique porous core/shell nanowires arrays architectures in the absence or presence of DETA during the solvothermal treatment process. The "alcoholysis" and "ripening" growth mechanism are proposed to explain the formation of honeycomb-like nanosheets shell on nanowires core. Based on careful control of experimental condition, a novel double layered TiO2 photoanode (DL-TNW@NS-YSHTSs) consisting of 16 um thick TNW@NS under layer and 6 um thick yolk-shell hierarchical TiO2 microspheres (YSHTSs) top layer can be obtained, exhibiting an impressive PCE over 10 % at 100 mW cm-2, which can be attributed to the well-organized photoanode composed of hierarchical core-shell arrays architecture and yolk-shell hollow spheres architecture with synergistic effects of high dye loading and superior light scattering for prominent light harvesting efficiency.
    ACS Applied Materials & Interfaces 10/2014; 6(21). DOI:10.1021/am505044k · 5.90 Impact Factor
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    ABSTRACT: A powerful full solution-based process was demonstrated to synthesize various vertically aligned TiO2 wires/rods self-assembled arrays nanostructures on conductive substrates via a simple hydrothermal growth system. Demonstrated samples included a family of high-quality and high-crystallinity anatase nanowire arrays with smooth, hierarchical or hyperbranched architectures, thanks to oriented attachment and crystallization as well as a self-assembly growth mechanism. The proposed hyperbranched arrays, consisting of long TiO2 nanowire trunks, short TiO2 nanorod branches as well as tiny TiO2 nanorod leaves (recall a tree with luxuriant foliage) and thus possessing a microscopic feature size, overcome typical shortages of insufficient dye adsorption for conventional 1D smooth nanowire arrays or prototype hierarchical nanowire arrays when applied to DSSC, which achieved for the first time similar dye uptakes (i.e. 90.10 nmol cm(-2) vs 88.62 nmol cm(-2)) as nanoparticle counterparts under the same thickness. Dye-sensitized solar cell fabricated with an similar to 8 mu m long novel hyperbranched nanowire arrays photoelectrode yields an impressive power conversion efficiency (PCE) of 8.11%, which was much greater than that of anatase TiO2 nanoparticle (20 nm in diameter) counterpart due to synergistic effects of high dye uptakes and superior broadband light scattering for improved light harvesting as well as fast charge transport for efficient charge collection for the former.
    Nano Energy 10/2014; 9:15–24. DOI:10.1016/j.nanoen.2014.06.019 · 10.21 Impact Factor
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    ABSTRACT: The vertically aligned anatase TiO2 nanowire arrays with smooth or branched architectures were grown on TCO substrate directly via a simple surfactant-free hydrothermal route. And they were utilized to fabricate efficient quantum-dot sensitized solar cells (QDSSCs) for the first time. The thickness of CdS and CdSe shell were confirmed by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and energy dispersive X-Ray spectroscopy (EDX). A power conversion efficiency of 4.2% was attained with the hierarchical TiO2 nanowires based cell, which is 30% higher than that of smooth nanowires devices due to improved short-circuit current density (J(SC)) and fill factor (FF). The increased Jsc profits from superior light-scattering ability of branched hierarchical TiO2 nanowires for enhanced light-harvesting efficiency and the prominent charge-collection efficiency benefited from additional growth of branches for efficient and effective electron injection.
    Nano Energy 09/2014; 8. DOI:10.1016/j.nanoen.2014.05.003 · 10.21 Impact Factor
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    ABSTRACT: A rare example is reported in which discrete Ag2 L 2 ring and (AgL)∞ chain motifs [L = N,N′-bis(3-imidazol-1-yl-propyl)-pyromellitic diimide] co-crystallize in the same crystal lattice with varying ratios and degrees of disorder. Crystal structures obtained from representative crystals reveal compatible packing arrangements of the cyclic and polymeric isomers within the crystal lattice, which enables them to co-exist within a crystalline solid solution. A feasible pathway for transformation between the isomers is suggested via facile rotation of the coordinating imidazolyl groups. This chemical system could provide a chance for direct observation of ring-opening isomerization at the crystal surface. Mass spectrometry and 1H NMR titration show a dynamic equilibrium between cyclic and oligomeric species in solution, and a potential crystallization process is suggested involving alignment of precursors directed by aromatic stacking interactions between pyromellitic diimide units, followed by ring-opening isomerization at the interface between the solid and the solution. Both cyclic and oligomeric species can act as precursors, with interconversion between them being facile due to a low energy barrier for rotation of the imidazole rings. Thermogravimetric analysis and variable-temperature powder X-ray diffraction indicate a transition to a different crystalline phase around 120°C, which is associated with loss of solvent from the crystal lattice.
    09/2014; 1(Pt 5):318-27. DOI:10.1107/S2052252514015966
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    ABSTRACT: Metal–organic skeleton based gel electrolytes are prepared for the first time for high efficiency quasi-solid-state DSSCs. The gel electrolytes feature in their sponge-like porous matrix of a metal–organic gel (MOG) assembled by coordination of Al3+ and 1,3,5-benzenetricarboxylate (H3BTC), which can provide an excellent ability to accommodate electrolyte ingredients, thus largely preserving the properties of the liquid electrolyte. Meanwhile, the MOG electrolyte can well penetrate into the photoanode film to ensure a good interfacial contact. The effects of the concentration of active species in the MOG electrolyte on the photoelectrical performances are investigated. On increasing the concentration, Jsc of gel-state cells improves gradually due to the enhanced I−/I3− redox couple content, while Voc undergoes an increase first but decreases subsequently. The synergistic function of cations (such as Al3+, Li+, etc.) and tert-butylpyridine (TBP), which can induce a conductive band (CB) shift of the TiO2 photoanode and affect the electron recombination, may contribute to the variation of Voc. By optimizing the composition of the gel electrolyte, a high conversion efficiency of over 8.60% can be obtained, which is a little lower than that of a liquid-state cell (9.13%). This research study will open up a new way to fabricate quasi-solid-state DSSCs with high efficiency.
    08/2014; 2(37). DOI:10.1039/C4TA03120B
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    ABSTRACT: A novel dynamic covalent gel has been prepared via the imine bond formation reaction of tetraamine building blocks with luminescent tetraphenylethene tetraaldehyde units. The gel shows high hierarchical porosity (SBET = 512 m(2) g(-1)) and remarkable aggregation-induced emission enhancement, which has been demonstrated to be a selective sensor.
    Chemical Communications 08/2014; 50(80). DOI:10.1039/c4cc05120c · 6.72 Impact Factor
  • Mei Pan, Cheng-Yong Su
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    ABSTRACT: The Borromean link constitutes an intriguing type of entanglement and knot in both discrete coordination architectures (Borromeate or Borromeand) and infinite coordination assemblies (Borromean networks), and is characteristic of nontrivial three-ring links which are inseparable as a whole while cleavage of any ring makes the whole fall apart. This highlight paper covers recent advances in the assembly of coordination supramolecular structures showing Borromean-linking topological character.
    CrystEngComm 08/2014; 16(34). DOI:10.1039/C4CE00616J · 3.86 Impact Factor
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    ABSTRACT: The development of more selective chelators for the washing of heavy metal contaminated soil is desirable in order to avoid excessive dissolution of soil minerals. Speciation and mobility of Cu, Zn, Pb, and Ni in a contaminated soil washed with phenyldiaminetetraacetic acid (PDTA), a derivative of EDTA, were investigated by batch leaching test using a range of soil washing conditions followed by sequential extraction. With appropriate washing conditions, PDTA significantly enhanced extraction of Cu from the contaminated soil. The primary mechanisms of Cu extraction by PDTA were complexation-promoted dissolution of soil Cu and increased dissolution of soil organic matter (SOM). PDTA showed high selectivity for Cu(II) over soil component cations (Ca(II), Mg(II), Fe(III), Mn(II), Al(III)), especially at lower liquid-to-soil ratios under PDTA deficiency, thus avoiding unwanted dissolution of soil minerals during the soil washing process which can degrade soil structure and interfere with future land use. PDTA-enhanced soil washing increased the exchangeable fractions of Cu, Zn, and Pb and decreased their residual fractions, compared to their levels in unwashed soil.
    Chemosphere 08/2014; 109:1–6. DOI:10.1016/j.chemosphere.2014.02.039 · 3.50 Impact Factor
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    ABSTRACT: The present work establishes a facile process for one-step hydrothermal growth of vertically aligned anatase cactus-like branched TiO2 (CBT) arrays on a transparent conducting oxide (TCO) substrate. Various CBT morphologies are obtained by adjusting the potassium titanium oxide oxalate (PTO) reactant concentration (from 0.05 M to 0.15 M) and this yields a morphologically-controllable branched TiO2 arrays geometry. The CBT arrays consist of a vertically oriented nanowire (NW) or nanosheet (NS) stem and a host of short nanorod (NR) branches. The hierarchical CBT arrays demonstrate their excellent candidatures as photoanodes, which are capable of exhibiting high light-harvesting efficiency in dye-sensitized solar cells (DSSCs). Consequently, DSSCs based on 7 μm long optimized CBT arrays (0.05 M PTO), which are assembled with high density and high aspect-ratio NR branches, exhibit an impressive power conversion efficiency of 6.43% under AM 1.5G one sun illumination. The high performance can be attributed to the prominent light-harvesting efficiency, resulting from larger surface area and superior light-scattering capability.
    Journal of Power Sources 08/2014; 260:6–11. DOI:10.1016/j.jpowsour.2014.02.107 · 6.22 Impact Factor

Publication Stats

7k Citations
1,350.67 Total Impact Points

Institutions

  • 2005–2015
    • Sun Yat-Sen University
      • • Department of Chemical Engineering
      • • State Key Laboratory of Optoelectronic Materials and Technologies
      Shengcheng, Guangdong, China
    • South China Normal University
      • Department of Chemistry
      Shengcheng, Guangdong, China
    • Shandong Normal University
      Chi-nan-shih, Shandong Sheng, China
  • 1999–2015
    • Lanzhou University
      • State Key Laboratory of Applied and Organic Chemistry
      Kao-lan-hsien, Gansu Sheng, China
  • 1997–2014
    • Chinese Academy of Sciences
      • Shanghai Institute of Organic Chemistry
      Peping, Beijing, China
  • 1997–2010
    • Zhongshan University
      中山, Guangdong, China
  • 2003–2005
    • University of South Carolina
      • Chemistry and Biochemistry
      Columbia, SC, United States
    • Universität Stuttgart
      Stuttgart, Baden-Württemberg, Germany
  • 1998–2001
    • The Chinese University of Hong Kong
      • Department of Chemistry
      Hong Kong, Hong Kong