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Li C.-L.,China Pharmaceutical University | Li C.-L.,Key Laboratory of Eco Environment Related Polymer Materials | Lei Z.-Q.,Key Laboratory of Eco Environment Related Polymer Materials | Wang Q.-Z.,Key Laboratory of Eco Environment Related Polymer Materials | And 3 more authors.
Journal of Molecular Catalysis | Year: 2015

TiO2(B) nanobelts had been synthesized in highly yield and middle conditions via a simple route including tetrabutyl titanate hydrolysis in an alkali solution → hydrothermal → proton-exchange → roasting. Morphological evolution and crystalline structure transmission were also achieved by just controlling the experiment parameters. HRTEM, FESEM, XRD, UV-vis, BET and photo-stimulated surface reaction technology were used to investigate the surface structure, photo absorption property and photocatalytic performance of TiO2(B). The photocatalytic properties for H2 production were systematically tested. The results were shown that the photocatalytic activity followed the sequence: NaxH2- xTi3O7·nH2 nanowires > TiO2(B) > TiO2(anatase) > Na2Ti6O13. The obtained Ti2O(B) displayed relative excellent photocatalytic properties for H2 production. It was revealed that the morphology and crystalline structure phase played important roles in the photocatalytic reaction. In addition, a possible growth mechanism of TiO2(B) involving Na2Ti3O7 → H2Ti3O7 → H2Ti6O13 → H2Ti12O25 → TiO2(B) was proposed based on the structure examination. ©, 2015, Science Press. All right reserved.


Wang W.,Key Laboratory of Eco Environment Related Polymer Materials | Wang R.,Key Laboratory of Eco Environment Related Polymer Materials | Ji S.,University of the Western Cape | Feng H.,Northwest Normal University | And 2 more authors.
Journal of Power Sources | Year: 2010

In this study, a novel core-shell structured Pd3Fe@Pt/C electrocatalyst, which is based on Pt deposited onto carbon supported Pd3Fe nanoparticles, is prepared for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). The carbon supported Pd3Fe nanoparticles act as seeds to guide the growth of Pt. The formation of the core-shell structured Pd3Fe@Pt/C is confirmed by transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical characterization. The higher surface area of the synthesized catalyst suggests that the utilization of Pt in the Pd3Fe@Pt/C catalyst is higher than that in Pt/C. Furthermore, better electrocatalytic performance than that of Pt/C and Pd3Fe/C catalyst is observed in the ORR which follows a four-electron path. Consequently, the results indicate that the Pd3Fe@Pt/C catalyst could be used as a more economically viable alternative for the ORR of PEMFCs. © 2009 Elsevier B.V. All rights reserved.


Wang R.,Key Laboratory of Eco Environment Related Polymer Materials | Li H.,Huizhou University | Ji S.,University of the Western Cape | Wang H.,Key Laboratory of Eco Environment Related Polymer Materials | Lei Z.,Key Laboratory of Eco Environment Related Polymer Materials
Electrochimica Acta | Year: 2010

A low-cost and high performance catalyst consisting of Pt decorating PdNi/C (Pt-PdNi/C) for oxygen reduction is prepared by a two-stage route. The characterization techniques considered are X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX) technique. The results show that the Pt-PdNi/C catalyst has an average diameter of ca. 5 nm. The electrochemical activity for the ORR is evaluated from steady state polarization measurements, which are carried out in an ultra-thin layer rotating disk electrode (RDE). The RDE tests show that the Pt-PdNi/C catalyst has the highest ORR activity compared to pure Pt/C, Pd/C and PdNi/C catalysts. High electrocatalytic activities could be attributed to the synergistic effect between Pt and PdNi. © 2009.


Wang H.,Key Laboratory of Eco Environment Related Polymer Materials | Ji S.,University of the Western Cape | Wang W.,Key Laboratory of Eco Environment Related Polymer Materials | Linkov V.,University of the Western Cape | And 2 more authors.
International Journal of Electrochemical Science | Year: 2012

A carbon supported Pt-decorated PdFe alloy nano-core catalysts (Pt-PdFe/C) for methanol oxidation is prepared via metathetical reaction between PdFe alloy nanoparticles (deposited on carbon) and PtCl 4 2- in aqueous solution. Morphology and composition of the synthesized catalyst are characterized by Transmission Electron Microscope and X-ray diffraction. Experimental results show the electrochemical active surface area of the Pt-PdFe/C catalyst is much larger than those of the PdFe/C and Pt/C catalysts. Furthermore, the mass specific peak current is 1.01 A mg -1 for methanol oxidation on the Pt-PdFe/C electrode, an increase by a factor of 3.5 times and 12.6 times as compared to PtRu/C and Pt/C, respectively. The facile fabrication and high electrochemical performance of Pt-PdFe/C highlight its potential application as anode for DMFCs. © 2012 by ESG.


Huo C.,Key Laboratory of Eco Environment Related Polymer Materials | Huo C.,Northwest Normal University | Chan T.H.,Northwest Normal University | Chan T.H.,McGill University
Chemical Society Reviews | Year: 2010

This critical review describes a new liquid-phase strategy for organic synthesis by using organic ions as soluble supports. Catalysts or reagents or substrates are immobilized onto organic ions. They are generally soluble in polar organic solvents (e.g. CH3CN) or ionic liquids but insoluble in non-polar solvents (e.g. ether or hexanes). Their reactions are carried out in homogeneous solution phase with a polar organic solvent or ionic liquid. After the reaction, the ion-supported species can be phase separated through precipitation from the polar organic solvent by the addition of a less polar organic solvent or extraction with organic solvents from ionic liquids. The ion-supported species can therefore be easily recovered and purified from the reaction mixture by simple washings with the less polar solvent. The ion-tagged species can function in the role of a catalyst, or as a reagent, or as the substrate in the synthesis of small molecules or bio-oligomers. Ion-supported catalysts and reagents can usually be recovered and reused with little diminution of activity. Important biooligomers such as peptides, oligosaccharides and oligonucleotides have been synthesized with this method (136 references). © 2010 The Royal Society of Chemistry.


Jia X.-D.,Key Laboratory of Eco Environment Related Polymer Materials | Jia X.-D.,Northwest Normal University | Jia X.-D.,Lanzhou University | Wang X.-E.,Key Laboratory of Eco Environment Related Polymer Materials | And 6 more authors.
Organic Letters | Year: 2010

A Mannich reaction of imines and ketones induced by persistent radical cation salts was Investigated, and a series of Mannich bases, β-amlnoketones, were synthesized. A novel cyclization to form the 4-piperidone skeleton was achieved In a tandem process. The reaction can be rationalized as a radical cation process supported by various evidence. © 2010 American Chemical Society.


Wang R.,Key Laboratory of Eco Environment Related Polymer Materials | Li H.,Huizhou University | Feng H.,Northwest Normal University | Wang H.,Key Laboratory of Eco Environment Related Polymer Materials | Lei Z.,Key Laboratory of Eco Environment Related Polymer Materials
Journal of Power Sources | Year: 2010

In this study, a low-cost and high performance catalyst with core-shell structure of PdCu@PtRu/C for methanol oxidation is prepared by a two-step replacement reaction. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) examinations show that the composite catalyst particles distribution is quite homogeneous and has a high surface area. The Pt mass activity of this catalyst is about 15 and 3.4 times as large as those of the Pt/C and PtRu/C catalysts, respectively. High electrocatalytic activities could be attributed to the synergistic effect between PtRu and PdCu. © 2009 Elsevier B.V. All rights reserved.


Wang X.,Key Laboratory of Eco Environment Related Polymer Materials | Wang H.,Key Laboratory of Eco Environment Related Polymer Materials | Wang R.,Key Laboratory of Eco Environment Related Polymer Materials | Wang Q.,Key Laboratory of Eco Environment Related Polymer Materials | Lei Z.,Key Laboratory of Eco Environment Related Polymer Materials
Journal of Solid State Electrochemistry | Year: 2012

Carbon-supported platinum-decorated nickel nanoparticles (denoted as Pt-Ni/C) with intimate contact of Pt and Ni are prepared by a galvanic displacement reaction between Ni/C nanoparticles and PtCl 6 2- in aqueous solution. It demonstrates a higher mass activity and stability to methanol oxidation reaction than conventional Pt/C and PtRu/C catalysts by a rotating disk electrode in acid solution, which could be attributed to the modified electronic structure of the Pt-Ni/C nanoparticles. © Springer-Verlag 2011.


Wang Q.,Northwest Normal University | Wang Q.,Key Laboratory of Eco Environment Related Polymer Materials | Hui J.,Northwest Normal University | Li J.,Northwest Normal University | And 4 more authors.
Applied Surface Science | Year: 2013

Photocatalyst BiOCl modified by polyaniline (PANI/BiOCl) was synthesized via a facile chemisorptions method. X-ray diffraction (XRD), Scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectroscopy (DRS) were employed to study the phase structure, morphology and optical properties of the samples. The results showed that the PANI increased absorption intensity and absorption bands of the pure BiOCl. Photodegradation of methyl orange (MO) on the samples were investigated under visible light irradiation and 7 wt.% PANI/BiOCl composite showed the highest photocatalytic activity. The enhanced photocatalytic performance could be attributed to PANI/BiOCl composites and the synergistic effect between PANI and BiOCl. According to experimental results, the possible photocatalytic mechanism of the PANI/BiOCl photocatalysts was proposed. © 2013 Elsevier B.V. All rights reserved.


Quan Z.-J.,Key Laboratory of Eco Environment Related Polymer Materials | Quan Z.-J.,Northwest Normal University | Wang X.-C.,Key Laboratory of Eco Environment Related Polymer Materials | Wang X.-C.,Northwest Normal University
Chemical Record | Year: 2016

The allylamine skeleton represents a significant class of biologically active nitrogen compounds that are found in various natural products and drugs with well-recognized pharmacological properties. In this personal account, we will briefly discuss the synthesis of allylamine skeletons. We will focus on showing a general protocol for Lewis acid-catalyzed N-allylation of electron-poor N-heterocyclic amides and sulfonamide via an amide-aldehyde-alkene condensation reaction. The substrate scope with respect to N-heterocyclic amides, aldehydes, and alkenes will be discussed. This method is also capable of preparing the Naftifine motif from N-methyl-1-naphthamide or methyl (naphthalene-1-ylmethyl)carbamate, with paraformaldehyde and styrene in a one-pot manner. © 2016 The Chemical Society of Japan & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

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