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Dai J.-J.,Hefei University of Technology | Zhang W.-M.,Hefei University of Technology | Shu Y.-J.,Hefei University of Technology | Sun Y.-Y.,Hefei University of Technology | And 4 more authors.
Chemical Communications | Year: 2016

A photoredox catalytic method was developed for the direct cyanation of alkyltrifluoroborates. This reaction provides a new and useful transformation of the easily available alkyltrifluoroborates. The photocatalytic reaction can tolerate a variety of functional groups with mild reaction conditions. Mechanistic investigations are consistent with the present reaction following a radical pathway. © 2016 The Royal Society of Chemistry. Source

Zhang X.,Hefei University of Technology | Cheng J.,Hefei University of Technology | Cheng J.,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province | Li S.,Hefei University of Technology | Wang Y.,Hefei University of Technology
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2016

Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) powders were synthesized by a solid-state reaction method. The BSCF hollow fiber membranes with a diameter of 3 mm and a thickness of 400 μm were prepared by wet spinning and subsequently sintering processes. A BSCF porous layer was coated onto the outer surface of the BSCF hollow fiber membrane to modify the performance of oxygen permeation. The phase compositions of synthesized powders and hollow fiber membranes were analyzed by X-ray diffraction. The microstructure of the hollow fiber membrane was observed by scanning electron microscopy. The oxygen permeability of hollow fiber membranes were examined at different temperatures. The results indicate that the BSCF synthesized powders have a single perovskite phase. The BSCF hollow fiber membranes prepared by the wet spinning process have an asymmetric structure. The oxygen permeations of BSCF hollow fiber membrane in air/vacuum gradient are 0.382 and 1.284 mL/(cm2·min) at 700 and 900 ℃, respectively. After the surface modification, the oxygen permeation increases to 1.250 and 2.426 mL/(cm2·min), respectively. The activation energy of oxygen permeation decreases nearly a half after the surface modification, i.e., decreasing from 49.23 to 24.74 kJ/mol at 800-900 ℃. © 2016, Chinese Ceramic Society. All right reserved. Source

Xie B.,Wuhan University | Chen Y.,Wuhan University | Yu M.,Wuhan University | Sun T.,Wuhan University | And 6 more authors.
Carbon | Year: 2016

Graphene-based composites have been deemed as promising materials in renewable energy-storage applications. Herein, we report a hybrid architecture consisting of layered molybdenum sulfide nanosheets/N-doped graphene (MoS2/NG) synthesized by one-pot hydrothermal method. By adjusting precursor ratios, flower-like MoS2/NG hybrid with nitrogen content of 3.5 at.% on the graphene layers can be obtained. Electrochemical characterizations indicate that the maximum specific capacitance of the MoS2/NG electrodes reaches up to 245F/g at 0.25A/g (and 146F/g at 20A/g). In addition, the electrode exhibits superior cyclic stability with 91.3% capacitance retention after 1000 cycles at 2A/g. The outstanding performance of the MoS2/NG hybrid benefits from the synergistic effect between the layered MoS2 and N-doped graphene. © 2015 Elsevier Ltd. All rights reserved. Source

Wu G.J.,Hefei University of Technology | Xie K.,Hefei University of Technology | Xie K.,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province | Wu Y.C.,Hefei University of Technology | Wu Y.C.,Key Laboratory of Advanced Functional Materials and Devices of Anhui Province
Advanced Materials Research | Year: 2014

This paper investigates a composite cathode La0.2Sr0.8TiO3+δ-Ce0.8Sm0.2O2-δ (LSTO-SDC) for the direct steam electrolysis in an oxide-ion-conducting solid oxide electrolyzer. The dependences of electrical conductivity of the reduced LSTO on temperature and oxygen partial pressure are studied and further correlated to the electrochemical properties of the cathode in symmetric cell LSTO-SDC/YSZ/LSTO-SDC and solid oxide electrolyzer LSTO-SDC/YSZ/LSM-SDC, respectively. Current efficiencies of the solid oxide electrolyzer with LSTO-SDC cathode were found to be 92.38% and 91.17% with or without reducing gas flowing over them under the applied voltage of 1.8 V at 800 °C, respectively. © (2014) Trans Tech Publications, Switzerland. Source

Gao H.,Hefei University of Technology | Wang H.,Hefei University of Technology | Jin Y.,Hefei University of Technology | Lv J.,Hefei University of Technology | And 7 more authors.
Physical Chemistry Chemical Physics | Year: 2015

Immobilized TiO2 nanotube arrays (NTAs) co-modified with Pt and CdS nanoparticles were fabricated by using the combination of photoreduction and chemical bath deposition methods. XRD, SEM, TEM, XPS, UV-Vis and EDX methods were employed to characterize the microstructure and composition of samples, and the results showed that CdS and Pt NPs were uniformly deposited on the surface of TiO2 nanotubes. The CdS/Pt/TiO2 NTAs exhibited a much higher photocatalytic activity compared to pure TiO2 NTAs and binary CdS (or Pt)/TiO2 NTAs under visible light irradiation. A kinetic study showed that the rate constants of Pt/TiO2, CdS/TiO2 and CdS/Pt/TiO2 NTAs are 0.00736, 0.01717 and 0.02077 min-1, respectively, revealing a remarkable kinetic enhancement in the ternary heteronanostructures due to the synergistic effect of the three components. Besides, the CdS/Pt/TiO2 NTAs exhibit high stability after being used 22 times. Thus we proposed that such ternary heteronanostructures show great promise as immobilized catalysts for high efficient visible-light-driven photocatalysis. © the Owner Societies 2015. Source

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