Cheng-Yong Su

Sun Yat-Sen University, Shengcheng, Guangdong, China

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Publications (238)844.28 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: An unprecedented attempt was conducted on suitably functionalized integration of three-dimensional hyperbranched titania architectures for efficient multi-stack photoanode, constructed via layer-by-layer assembly of hyperbranched hier-archical tree-like titania nanowires (under layer), branched hierarchical rambutan-like titania hollow submicrometer-sized spheres (intermediate layer) and hyperbranched hierarchical urchin-like titania micrometer-sized spheres (top layer). Owing to favorable charge-collection, superior light harvesting efficiency and extended electron lifetime, the multi-layered TiO2 based devices showed greater Jsc and Voc than those of conventional TiO2 nanoparticle (TNP) and an overall power conversion efficiency of 11.01% (Jsc =18.53 mA cm-2; Voc = 827 mV and FF = 0.72) was attained, which remarkably outperformed that of a TNP-based reference cell (η=7.62%) with a similar film thickness. Meanwhile, the facile and operable film-fabricating technique (hydrothermal and drop-casting) provides a promising scheme and great simplicity for high performance/cost ratio photovoltaic devices processability in a sustainable way.
    Journal of the American Chemical Society 04/2014; · 10.68 Impact Factor
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    ABSTRACT: Light-harvesting and charge collection have attracted increasing attention in the domain of photovoltaic cells, and can be facilitated dramatically by appropriate design of a photonic nanostructure. However, the applicability of current light-harvesting photoanode materials with single component and/or morphology (such as, particles, spheres, wires, sheets) is still limited by drawbacks such as insufficient electron-hole separation and/or light-trapping. Herein, we introduce a universal method to prepare hierarchical assembly of macroporous material-nanowire coated homogenous or heterogeneous metal oxide composite electrodes (TiO2 -TiO2 , SnO2 -TiO2 , and Zn2 SnO4 -TiO2 ; homogenous refers to a material in which the nanowire and the macroporous material have the same composition, i.e. both are TiO2 . Heterogeneous refers to a material in which the nanowires and the macroporous material have different compositions). The dye-sensitized solar cell based on a TiO2 -macroporous material-TiO2 -nanowire homogenous composition electrode shows an impressive conversion efficiency of 9.51 %, which is much higher than that of pure macroporous material-based photoelectrodes to date.
    Angewandte Chemie International Edition 03/2014; · 13.73 Impact Factor
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    ABSTRACT: A stepwise synthesis of nanosized Pd-Ru heteronuclear metal-organic cage from predesigned redox- and photo-active Ru(II)-metalloligand and naked Pd(II) ion is described. The resulting cage shows rhombododecahedral shape and contains 5350 Å3 cavity and 12 open windows, facilitating effective trapping of both polar and nonpolar guest molecules. Protection of photosensitive guests against UV radiation has been studied.
    Journal of the American Chemical Society 03/2014; · 10.68 Impact Factor
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    ABSTRACT: Organic–inorganic hybrid aerogels are receiving growing attention due to their high tuneability. In this contribution a novel type of organic–inorganic hybrid aerogels with high micro- and mesoporosity have been prepared successfully from a bridging bis(acetylacetonate) ligand, 3,4-diacetyl-2,5-dioxohexane, and trivalent metal ions (Al3+ and Cr3+). The metal-acetylacetonate aerogels compose of nanoscale metal-organic particles, which aggregate to form the gel matrix. N2 sorption shows that the aerogels have high BET surface areas up to ∼1100 m2 g−1 and hierarchical porosity. The porosity can be altered by introducing of second divalent metal ions into the aerogel. The aerogels show ability to adsorb various gases (H2, CO2 and CH4) and vapors (MeOH and EtOH). Water sorption measurements reveal that the aerogels have relatively hydrophobic pore surface.
    Microporous and Mesoporous Materials 01/2014; 187:108–113. · 3.37 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 01/2014; 109:1–6. · 3.14 Impact Factor
  • Journal of Power Sources 01/2014; 260:6–11. · 4.68 Impact Factor
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    ABSTRACT: A photochromic metal-organic gel with thermo-, photo-, and anion-responsive behavior is obtained. Unusually, heating of the Al-ligand solution leads to gel formation and cooling to room temperature reverses the process to reform the solution. The gel is sensitive to weakly coordinating anions. Additionally, reversible photochromic transformations take place both in the solution and gel states, accompanied by reversibly switched luminescence.
    Advanced Materials 12/2013; · 14.83 Impact Factor
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    ABSTRACT: The mechanisms and enantioselectivities of the dirhodium (Rh2L4, L = formate, N-methylformamide, S-nap)-catalyzed intramolecular C-H aminations of 3-phenylpropylsulfamate ester have been investigated in detail with BPW91 density functional theory computations. The reactions catalyzed by the Rh2(II,II) catalysts start from the oxidation of the Rh2(II,II) dimer to a triplet mixed-valent Rh2(II,III)-nitrene radical, which should facilitate radical H-atom abstraction. However, in the Rh2(formate)4-promoted reaction, as a result of a minimum-energy crossing point (MECP) between the singlet and triplet profiles, a direct C-H bond insertion is postulated. The Rh2(N-methylformamide)4 reaction exhibits quite different mechanistic characteristics, taking place via a two-step process involving (i) intramolecular H-abstraction on the triplet profile to generate a diradical intermediate and (ii) C-N formation by intersystem crossing from the triplet state to the open-shell singlet state. The stepwise mechanism was found to hold also in the reaction of 3-phenylpropylsulfamate ester catalyzed by Rh2(S-nap)4. Furthermore, the diradical intermediate also constitutes the starting point for competition steps involving enantioselectivity, which is determined by the C-N formation open-shell singlet transition state. This mechanistic proposal is supported by the calculated enantiomeric excess (94.2% ee) with the absolute stereochemistry of the product as R, in good agreement with the experimental results (92.0% ee).
    The Journal of Organic Chemistry 12/2013; · 4.56 Impact Factor
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    ABSTRACT: A hierarchical macroporous Zn2SnO4-ZnO nanorod composite film is prepared through a drop-casting process of PS@Zn2SnO4 and subsequent hydrothermal growth of ZnO nanorod. CdS/CdSe co-sensitized solar cells based on the macroporous Zn2SnO4-ZnO nanorod composite photoelectrode exhibits an enhancement of 34.4 % in power conversion efficiency (1.68 %) compared to the pristine macroporous Zn2SnO4 photoelectrode (1.25 %). Especially worth to be noted is that the growth of ZnO nanorods contributes greatly to the enlargement of surface area and improvement of light scattering ability of the composite film, which dominates the increase of Jsc values and eventual power conversion efficiency. QDSSCs based on the optimized 9 m thick composite photoanode film exhibits a power conversion efficiency of 2.08 %, which is the highest value for the reported QDs sensitized solar cells based on the Zn2SnO4 photoelectrode.
    ACS Applied Materials & Interfaces 11/2013; · 5.01 Impact Factor
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    ABSTRACT: Bridged metal complexes [{Cu(tmpa)}2(μ-L(1)-2H)](ClO4)2 (1), [{Cu(tmpa)}2(μ-L(2)-2H)](ClO4)2 (2), [{Cu(tmpa)}2(μ-L(3)-2H)](BPh4)2 (3), and [{Cu(tmpa)}2(μ-L(4)-2H)](ClO4)2 (4) (tmpa = tris(2-pyridylmethyl)amine, L(1) = chloranilic acid, L(2) = 2,5-dihydroxy-1,4-benzoquinone, L(3) = (2,5-di-[2-(methoxy)-anilino]-1,4-benzoquinone, L(4) = azophenine) were synthesized from copper(II) salts, tmpa, and the bridging quinonoid ligands in the presence of a base. X-ray structural characterization of the complexes showed a distorted octahedral environment around the copper(II) centers for the complexes 1-3, the donors being the nitrogen atoms of tmpa, and the nitrogen or oxygen donors of the bridging quinones. In contrast, the copper(II) centers in 4 display a distorted square-pyramidal coordination, where one of the pyridine arms of each tmpa remains uncoordinated. Bond-length analyses within the bridging ligand exhibit localization of the double bonds inside the bridge for 1-3. In contrast, complete delocalization of double bonds within the bridging ligand is observed for 4. Temperature-dependent magnetic susceptibility measurements on the complexes reveal an antiferromagnetic coupling between the copper(II) ions. The strength of antiferromagnetic coupling was observed to depend on the energy of the HOMO of the bridging quinone ligands, with exchange coupling constants J in the range between -23.2 and -0.6 cm(-1) and the strength of antiferromagnetic coupling of 4 > 3 > 2 > 1. Broken-symmetry density functional theory calculations (DFT) revealed that the orientation of magnetic orbitals in 1 and 2 is different than that in 3 and 4, and this results in two different exchange pathways. These results demonstrate how bridge-mediated spin-spin coupling in quinone-bridged metal complexes can be strongly tuned by a rational design of the bridging ligand employing the [O] for [NR] isoelectronic analogy.
    Inorganic Chemistry 09/2013; · 4.59 Impact Factor
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    ABSTRACT: Soil washing is one of the few permanent treatment alternatives for removing metal contaminants. Ethylenediaminetetraacetic acid (EDTA) and its salts can substantially increase heavy metal removal from contaminated soils and have been extensively studied for soil washing. However, EDTA has a poor utilization ratio due to its low selectivity resulting from the competition between soil major cations and trace metal ions for chelation. The present study evaluated the potential for soil washing using EDTA and three of its derivatives: CDTA (trans-1,2-cyclohexanediaminetetraacetic acid), BDTA (benzyldiaminetetraacetic acid), and PDTA (phenyldiaminetetraacetic acid), which contain a cylcohexane ring, a benzyl group, and a phenyl group, respectively. Titration results showed that PDTA had the highest stability constants for Cu(2+) and Ni(2+) and the highest overall selectivity for trace metals over major cations. Equilibrium batch experiments were conducted to evaluate the efficacy of the EDTA derivatives at extracting Cu(2+), Zn(2+), Ni(2+), Pb(2+), Ca(2+), and Fe(3+) from a contaminated soil. At pH 7.0, PDTA extracted 1.5 times more Cu(2+) than did EDTA, but only 75% as much Ca(2+). Although CDTA was a strong chelator of heavy metal ions, its overall selectivity was lower and comparable to that of EDTA. BDTA was the least effective extractant because its stability constants with heavy metals were low. PDTA is potentially a practical washing agent for soils contaminated with trace metals.
    Journal of hazardous materials 09/2013; 262C:464-471. · 4.14 Impact Factor
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    ABSTRACT: Ultra-porous anatase TiO2 nanorods with a composite structure of mesopores and macropores fabricated via a simple microemulsion electrospinning approach were first used as photoanode materials for high-efficiency dye-sensitized solar cells (DSSCs). The special multi-scale porous structure was formed by using low-cost paraffin oil microemulsion droplets as the soft template, which can not only provide enhanced adsorption sites for dye molecules but also facilitate the electrolyte diffusion. The morphology, porosity, photovoltaic and electron dynamic characteristics of the porous TiO2 nanorods based DSSCs were investigated in detail by scanning electron microscopy (SEM), N2 sorption measurements, current density-voltage (J-V) curves, UV-vis diffuse reflectance spectra, electrochemical impedance spectroscopy (EIS), intensity modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS), and open-circuit voltage decay (OCVD) measurements. The results revealed that although fewer amounts of dyes were anchored on the porous TiO2 nanorod films, they exhibited stronger light scattering ability, fast electrolyte diffusion and extended electron lifetime compared to the commercial P25 nanoparticles. A power conversion efficiency of 6.07 % was obtained for the porous TiO2 nanorod based DSSCs. Moreover, this value can be further improved to 8.53 % when bi-layer structured photoanode with porous TiO2 nanorods acting as the light scattering layer was constructed. This study demonstrated that the porous TiO2 nanorods can work as promising photoanode materials for DSSCs.
    ACS Applied Materials & Interfaces 08/2013; · 5.01 Impact Factor
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    ABSTRACT: A microporous coordination framework formed by hydrogen-bonding directed assembly of Cu(II) hexanuclear rings can act as a host for iodine accumulation in an aqueous solution. Various iodine species, I−, I3− or I2, are able to be trapped in the hydrophilic voids of the crystals via a single-crystal-to-single-crystal ion-exchange process. The chemical nature of the iodine species encapsulated inside the coordination framework have been established by single crystal and powder XRD, IR, XPS, EA, TG and iodometric methods. Furthermore, the accumulated iodine species can be easily extracted from the crystals by organic solvents. The kinetics of I3− release from the crystals by extraction with ethanol has been studied.
    J. Mater. Chem. A. 06/2013;
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    ABSTRACT: Starburst triarylamine-based organic dyes (, , and ) have been synthesized. For the three designed dyes, the starburst triarylamine group, thiophene (or 3,4-ethylenedioxythiophene), and cyanoacetic acid take the role of electron donor, π-conjugation bridge, and electron acceptor, respectively. These compounds are characterized by photophysical, electrochemical, and theoretical computational methods. Nanocrystalline TiO2-based dye-sensitized solar cells were fabricated using these molecules as light-harvesting sensitizers. The overall efficiencies of the sensitized cells range from 5.48 to 6.15%. It was found that the introduction of the EDOT group in bathochromically extended the absorption spectra, resulting in a leap in the photovoltaic performance in comparison to . Incorporation of a hydrophobic carbazole-containing segment at relative with retarded the electron transfer from TiO2 to the oxidized dye or electrolyte, leading to an increase of electron lifetime.
    Physical Chemistry Chemical Physics 06/2013; · 3.83 Impact Factor
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    ABSTRACT: The exclusive formation of the 1,5-cycloaddition product between azides and alkynes is taken advantage of in generating the first examples of abnormal carbenes from these precursors. This new route provides unprecedented post-functionalization possibilities for such abnormal carbenes.
    Dalton Transactions 05/2013; · 3.81 Impact Factor
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    ABSTRACT: The vertically oriented anatase single crystalline TiO2 nanostructure arrays (TNAs) consisting of TiO2 truncated octahedrons with exposed {001} facets or hierarchical TiO2 nanotubes (HNTs) consisting of numerous nanocrystals on Ti-foil substrate were synthesized via a two-step hydrothermal growth process. The first step hydrothermal reaction of Ti foil and NaOH leads to the formation of H-titanate nanowire arrays, which is further performed the second step hydrothermal reaction to obtain the oriented anatase single crystalline TiO2 nanostructures such as TiO2 nanoarrays assembly with truncated octahedral TiO2 nanocrystals in the presence of NH4F aqueous or hierarchical TiO2 nanotubes with walls made of nanocrystals in the presence of pure water. Subsequently, these TiO2 nanostructures were utilized to produce dye-sensitized solar cells in a backside illumination pattern, yielding a significant high power conversion efficiency (PCE) of 4.66% (TNAs, JSC = 7.46 mA cm(-2), VOC = 839 mV, FF = 0.75) and 5.84% (HNTs, JSC = 10.02 mA cm(-2), VOC = 817 mV, FF = 0.72), respectively.
    Scientific Reports 05/2013; 3:1892. · 2.93 Impact Factor
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    ABSTRACT: Hierarchical macroporous Zn2SnO4 consisting of nanoparticles has been synthesized for the first time through an in situ hydrothermal and a following annealing process in the presence of a polystyrene (PS) template. Zn2SnO4 macropore sizes are tuned in the range of 180-650 nm by selecting the appropriate size of PS spheres, and the building unit size of the Zn2SnO4 macropore is 4.2 nm regardless of the PS sizes. The photovoltaic performances of the dye-sensitized solar cell based on hierarchical macroporous Zn2SnO4 with 200, 400, 600 and 750 nm PS spheres are 5.01, 4.76, 4.39 and 3.92%, respectively. The smaller pore size of Zn2SnO4 exhibits higher photovoltaic performance, which is ascribed to the higher dye loading, faster electron transport rate and slower electron recombination rate. These are confirmed by UV-vis absorption spectroscopy, intensity-modulated photocurrent spectroscopy, intensity-modulated photovoltage spectroscopy and electrochemical impedance spectroscopy. The double layered photoelectrode based on a Zn2SnO4 nanoparticles dye adsorption layer (4.2 nm in particle size, 15 μm in film thickness) and a macroporous light scattering layer (180 nm in macropore size, 4.0 μm in thickness) shows a remarkable enhancement in power conversion efficiency (6.10%) compared to that of Zn2SnO4 nanoparticles photoelectrode (5.36%) because of its superior light scattering ability.
    Nanoscale 05/2013; · 6.23 Impact Factor
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    ABSTRACT: The coordination complexes of Ni(II) with the tripodal ligands tpta (tris[(1-phenyl-1H-1,2,3-triazol-4-yl)methyl]amine), tbta ([(1-benzyl-1H-1,2,3-triazol-4-yl)methyl]amine), and tdta (tris[(1-(2,6-diisopropyl-phenyl)-1H-1,2,3-triazol-4-yl)methyl]amine) and the bidentate ligand pyta (1-(2,6-diisopropylphenyl)-4-(2-pyridyl)-1,2,3-triazole), [Ni(tpta)2](BF4)2 (1), [Ni(tbta)2](BF4)2 (2), [Ni(tdta)2](BF4)2 (3), and [Ni(pyta)3](BF4)2 (4), were synthesized from Ni(BF4)2·6H2O and the corresponding ligands. Complexes 2 and 4 were also characterized structurally using X-ray diffraction and magnetically via susceptibility measurements. Structural characterization of 2 that contains the potentially tetradentate, tripodal tbta ligand revealed that the Ni(II) center in that complex is in a distorted octahedral environment, being surrounded by two of the tripodal ligands. Each of those ligands coordinate to the Ni(II) center through the central amine nitrogen atom and two of the triazole nitrogen donors; the Ni-N(amine) distances being longer than Ni-N(triazole) distances. In case of 4, three of the bidentate ligands pyta bind to the Ni(II) center with the binding of the triazole nitrogen atoms being stronger than those of the pyridine. Temperature dependent susceptibility measurements on 2 and 4 revealed a room temperature χMT value of 1.18 and 1.20 cm(3) K mol(-1), respectively, indicative of S = 1 systems. High-frequency and -field EPR (HFEPR) measurements were performed on all the complexes to accurately determine their g-tensors and the all-important zero-field splitting (zfs) parameters D and E. Interpretation of the optical d-d absorption spectra using ligand field theory revealed the B and Dq values for these complexes. Quantum chemical calculations based on the X-ray and DFT optimized geometries and their ligand field analysis have been used to characterize the metal-ligand bonding and its influence on the magnitude and sign of the zfs parameters. This is the first time that such extensive HFEPR, LFT, and advanced computational studies are being reported on a series of mononuclear, distorted octahedral Ni(II) complexes containing different kinds of nitrogen donating ligands in the same complex.
    Inorganic Chemistry 05/2013; · 4.59 Impact Factor
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    ABSTRACT: Hierarchical one-dimensional SnO2 nanofibers (NFs) consisting of nanoparticles (NPs) have been synthesized and employed as efficient light scattering layer to fabricate double layered dye-sensitized solar cells (DSSCs). The photovoltaic performance (5.44 %) of the DSSC based on SnO2 NPs (14.5 um)/NFs (4.0 um) double layered photoanode showed a 26.3 % enhancement compared to that of SnO2 NPs photoanode(18.5um, 4.30 %). Intensity modulation photocurrent spectroscopy (IMPS), Intensity-modulated voltage spectroscopy (IMVS) and open-circuit voltage decay (OCVD) spectroscopy were used to investigate the kinetics process of electron transport and recombination within SnO2 NPs or NPs/NFs based DSSCs which revealed that the superior property for the SnO2 NPs/NFs photoanode: faster electron transport rate and lower recombination rate. The UV-vis diffuse reflectance spectra results showed that the SnO2 NPs/NFs possess better light scattering ability which enhanced the photovoltaic performance compared to the SnO2 NPs. Furthermore, an overall power conversion efficiency of 6.31 % (with a Jsc of 16.78 mA cm-2, Voc of 711 mV and FF of 0.53) was achieved for the SnO2 NPs/NFs double layered photoanode with additional SnO2 blocking layer which suppressed the electron recombination between FTO glass and electrolyte.
    RSC Advances 05/2013; · 2.56 Impact Factor
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    ABSTRACT: Macroporous SnO2 composed of small SnO2 nanoparticles with diameters around 10 nm is prepared via a reflux process. This novel structure is designed as the photoanode in dye-sensitized solar cells (DSSCs), intending to improve the light utilization efficiency with its excellent light scattering ability. Though the dye adsorption of macroporous SnO2 (14.00×10-8 mol cm-2) is lower than that of SnO2 nanoparticles (19.24×10-8 mol cm-2), the photovoltaic performance of the DSSCs based on the former is 4.87 % compared to 4.41 % for SnO2 nanoparticles, showing over 10 % increment than the latter. This improvement is mainly due to the enhanced light scattering ability and charge collection efficiency of the macroporous structure, both of which contribute to a higher short current density and hence for the better power conversion efficiency. Furthermore, a double-layer structure composed of SnO2 nanoparticles (active layer) and macroporous SnO2 (scattering layer) possess both large dye adsorption (22.82×10-8 mol cm-2) and scattering property, thus leads to a significant overall conversion efficiency of 5.78 %.
    ACS Applied Materials & Interfaces 05/2013; · 5.01 Impact Factor

Publication Stats

866 Citations
166 Downloads
844.28 Total Impact Points

Institutions

  • 2004–2014
    • Sun Yat-Sen University
      • Department of Chemical Engineering
      Shengcheng, Guangdong, China
  • 2013
    • Freie Universität Berlin
      • Institute of Chemistry and Biochemistry
      Berlin, Land Berlin, Germany
  • 2012
    • Karlsruhe Institute of Technology
      • Institut für Nanotechnologie
      Eggenstein-Leopoldshafen, Baden-Wuerttemberg, Germany
  • 2008–2012
    • Universität Stuttgart
      • Institute of Inorganic Chemistry
      Stuttgart, Baden-Wuerttemberg, Germany
  • 2011
    • Tianjin Medical University
      • School of Pharmacy
      T’ien-ching-shih, Tianjin Shi, China
  • 2009
    • Northeast Institute of Geography and Agroecology
      • State Key Laboratory of Structural Chemistry
      Beijing, Beijing Shi, China
  • 1999–2007
    • Lanzhou University
      • State Key Laboratory of Applied and Organic Chemistry
      Lanzhou, Gansu Sheng, China
  • 2003–2006
    • University of South Carolina
      • Chemistry and Biochemistry
      Columbia, SC, United States
    • Nagasaki University
      • Faculty of Education
      Nagasaki-shi, Nagasaki-ken, Japan
  • 2005
    • Shandong Normal University
      Chi-nan-shih, Shandong Sheng, China
  • 1998–2003
    • Zhongshan University
      中山, Guangdong, China
  • 2000–2001
    • The Chinese University of Hong Kong
      • Department of Chemistry
      Hong Kong, Hong Kong