Key Laboratory of Fuel Cell Technology of Guangdong Province

Wushan, China

Key Laboratory of Fuel Cell Technology of Guangdong Province

Wushan, China

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Meng H.,South China University of Technology | Wang B.,South China University of Technology | Liu S.,South China University of Technology | Liu S.,Key Laboratory of Fuel Cell Technology of Guangdong Province | And 2 more authors.
Ceramics International | Year: 2013

Highly active TiO2/Fe-TiO2 composite photocatalysts with a p-n heterojunction structure have been prepared by mixing hydrothermal-derived TiO2 and Fe-TiO2 nano-powders followed by grinding and drying. These photocatalysts were characterized by XPS, XRD, TEM, BET, UV-vis and Fluorescence spectroscopy, and their photocatalytic activities were evaluated by the decolorization rate of methyl orange under UV irradiation. TiO2/Fe-TiO2 composite photocatalysts were generally shown to have a much higher photocatalytic destruction rate than pure TiO2, mainly due to electrostatic-field-driven electron-hole separation in TiO2/Fe-TiO2 composites. The best TiO 2/Fe-TiO2 composite photocatalyst with mass ratio TiO 2:0.5 at%Fe-TiO2 of 12:1 showed approximately 3.8 times higher photocatalytic activity than undoped TiO2. © 2013 Elsevier Ltd and Techna Group S.r.l.


Xie Y.,South China University of Technology | Tang Y.,South China University of Technology | Tang Y.,CAS Guangzhou Institute of Chemistry | Liu J.,South China University of Technology | And 2 more authors.
Journal of Solid State Electrochemistry | Year: 2013

Anode-supported tubular solid oxide fuel cells (SOFCs) with Cu-CeO 2-yttria-stabilized zirconia (YSZ) anode, YSZ electrolyte film, and silver cathode were fabricated. The cells were tested with 5 wt% Fe-loaded activated carbon and dry CO, respectively, and their performances were compared to verify the reaction mechanism of direct carbon SOFCs (DC-SOFCs). The corresponding current-voltage curves and impedance characteristics of the cells operating on these two different fuels were found to be almost the same at high temperatures, demonstrating the presumed mechanism that the anode reaction of a DC-SOFC is the electrochemical oxidation of CO, just as in a SOFC operated directly on CO. Some experimental evidences including the difference in open circuit voltage at different temperatures and the operating stability of the cells were analyzed in detail. © 2012 Springer-Verlag.


Liu Y.,South China University of Technology | Bai Y.,South China University of Technology | Liu J.,South China University of Technology | Liu J.,Key Laboratory of Fuel Cell Technology of Guangdong Province | Liu J.,Key Laboratory of Enhanced Heat Transfer and Energy Conservation
Journal of the Electrochemical Society | Year: 2013

An anode-supported cone-shaped tubular solid oxide fuel cell (SOFC) with (Ni0.75Fe0.25-5%MgO)/YSZ anode is prepared and is directly operated on dry and moist CO fuel, respectively. At 800°C, the cell exhibits a maximum power density (MPD) of 424 mWcm-2 for dry CO and 388 mWcm-2 for moist CO. The durability test results show no significant degradation in performance for this kind of cell operated on either dry or moist CO after an operation time of 40 h at a constant current of 83 mA cm-2 at 800°C, while the cell with Ni/YSZ anode, in comparison, fails rapidly. A two-cell-stack based on the above mentioned SOFCs is fabricated and tested by direct utilization of moist CO as fuel. The SOFC stack presents an open circuit voltage (OCV) of 2 V and a maximum output power of 4 W at 800°C. And it exhibits good stability and dependability during an operation time of 90 h. The results demonstrate that (Ni0.75Fe 0.25-5%MgO)/YSZ would be a promising anode for SOFC operating on CO or CO-contained fuels. © 2012 The Electrochemical Society.


Wang H.,South China University of Technology | Liu J.,South China University of Technology | Liu J.,Key Laboratory of Enhanced Heat Transfer and Energy Conservation | Liu J.,Key Laboratory of Fuel Cell Technology of Guangdong Province
International Journal of Hydrogen Energy | Year: 2012

Anode-supported cone-shaped tubular solid oxide fuel cells (SOFCs) are successfully fabricated by a phase inversion method. During processing, the two opposite sides of each cone-shaped anode tube are in different conditions - one side is in contact with coagulant (the corresponding surface is named as "W-surface"), while the other is isolated from coagulate (I-surface). Single SOFCs are made with YSZ electrolyte membrane coated on either W-surface or I-surface. Compared to the cell with YSZ membrane on W-surface, the cell on I-surface exhibits better performance, giving a maximum power density of 350 mW cm-2 at 800°C, using wet hydrogen as fuel and ambient air as oxidant. AC impedance test results are consistent with the performance. The sectional and surface structures of the SOFCs were examined by SEM and the relationship between SOFC performance and anode structure is analyzed. Structure of anodes fabricated at different phase inversion temperature is also investigated. Copyright © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Lei L.,South China University of Technology | Bai Y.,South China University of Technology | Liu Y.,South China University of Technology | Liu J.,Key Laboratory of Fuel Cell Technology of Guangdong Province | Liu J.,New Energy Research Center
International Journal of Applied Ceramic Technology | Year: 2015

To cut down the energy consumption and processing period, Ni-YSZ anode-supported thin YSZ electrolyte SOFCs have been fabricated by an improved dip-coating technique, in which the electrolyte layer was dip-coated on green anode substrates instead of prefired ones, followed by co-firing. The film formation mechanisms of dip-coating were analyzed with liquid entrainment and capillary effect assumptions. According to the mechanisms, a typical YSZ electrolyte slurry formula of conventional dip-coating technique was modified for the improved technique by increasing the binder content and the solid loading. With the improved dip-coating technique, along with an optimized electrolyte slurry formula, a SOFC with dense electrolyte, revealing a maximum power density of 460 mW/cm2 at 800°C, was obtained. Factors affecting the coating layers were also investigated by SEM and AC impedance analyses. © 2013 The American Ceramic Society.


Li H.,Huizhou University | Li H.,Key Laboratory of Fuel Cell Technology of Guangdong Province | Liao J.,Huizhou University | Zhang X.,Huizhou University | And 6 more authors.
Journal of Power Sources | Year: 2013

As a representative catalyst for the hydrolysis of NaBH4 to produce hydrogen, nanostructured Co has received intensive attention owing to its high catalytic activity and low cost. In this study, nanostructured Co films supported on Cu foils are fabricated by a facile and cost effective magnetic-field-induced chemical reduction method. By controlling the synthetic conditions, Co films composed of nanoplatelets, nanosheets and microspheres are successfully obtained. It is found that the as-prepared nanostructured Co film catalysts exhibit high performance in the hydrolysis of sodium borohydride. The rate constant/apparent activation energy of NaBH4 hydrolysis in the presence of these Co film catalysts is 1.27 mL min-1 cm -2/28.4 kJ mol-1, 0.96 mL min-1 cm -2/27.6 kJ mol-1 and 0.85 mL min-1 cm -2/34.3 kJ mol-1, respectively. Interestingly, Co film composed of nanoplatelets shows only ca. 10% catalytic activity loss after 10 cycles, which exhibits much improved reusability and durability in contrast to those Co catalysts reported in the literature. © 2013 Elsevier B.V. All rights reserved.


Liu H.,South China University of Technology | Liu H.,Key Laboratory of Fuel Cell Technology of Guangdong Province | Peng X.,South China University of Technology | Peng X.,Key Laboratory of Fuel Cell Technology of Guangdong Province | And 2 more authors.
Inorganic Chemistry Communications | Year: 2014

A novel trivalent europium, Eu(III), 2,2′-bipyridine-5,5′- dicarboxylic acid (bpdc) metal-organic framework, namely, [Eu 4(bpdc)6(CH3NH2)3(DMSO) (H2O)] 1 was synthesized by the solvothermal reaction of bpdc with trivalent Eu(III) salts in a mixed solvent system containing N,N′-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). The single X-ray diffraction indicated that complex 1 had a novel porous three-dimensional framework with two different binuclear metal units. The photoluminescence spectrum of the complex displayed strong emission maxima at 472 and 618 nm. © 2014 Elsevier B.V.


Han L.,South China University of Technology | Zhou X.,South China University of Technology | Wan L.,South China University of Technology | Deng Y.,South China University of Technology | And 2 more authors.
Journal of Environmental Chemical Engineering | Year: 2014

Two pure spinel ZnFe2O4 nanocrystals have been synthesized by hydrothermal approach with/without an organic carboxylic acid-assisted reaction. The effects of synthetic parameters on morphologies, phase-purity and particle sizes of the obtained samples were investigated. The as-prepared samples were characterized by XRD, EDS, UV-vis, FT-IR, XPS, nitrogen adsorption-desorption and TEM. The photocatalytic properties of the obtained ZnFe2O4 samples were investigated to determine their visible-light induced degradation of rhodamine B (RhB). The results show that the as-synthesized ZnFe2O4 nanoplates using succinic acid-assisted hydrothermal approach has good photocatalytic activity, which is probably attributed to the multiple synergetic factors that stem from their low band gap, regular plate morphology, high crystallinity, reasonable pores sizes. The results from current study suggest that the ZnFe2O4 with particle morphology, suitable specific surface areas and high crystallinity will have potentially application for treatment of the organic dyes (RhB) in the polluted water. © 2013 Elsevier Ltd.


Yan Y.,South China University of Technology | Guan H.,South China University of Technology | Liu S.,South China University of Technology | Liu S.,Key Laboratory of Fuel Cell Technology of Guangdong Province | Jiang R.,South China University of Technology
Ceramics International | Year: 2014

Highly active Ag3PO4/Fe2O3 composite photocatalysts with an n-n heterojunction semiconductor structure have been prepared by ultrasound-assisted precipitation. These photocatalysts were characterized by XPS, XRD, SEM, TEM, UV-vis and PL spectroscopy. The photodegradation of methyl orange in aqueous solution under visible-light irradiation has been investigated over Ag3PO4-based photocatalysts consisting of different Ag3PO4/Fe 2O3 mass ratios. Ag3PO4/Fe 2O3 composite photocatalysts were shown to have a higher photocatalytic destruction rate than Ag3PO4 mainly due to electrostatic-field-driven electron-hole separation in Ag3PO 4/Fe2O3 composite photocatalysts. The best Ag3PO4/Fe2O3 composite photocatalyst with mass ratio of Ag3PO4:Fe2O3 of 10:1 showed approximately 6 times higher photocatalytic activity than pure Ag3PO4. The role of n-n Ag3PO 4-Fe2O3 heterojunction was discussed in view of theory of semiconductor physics. © 2014 Elsevier Ltd and Techna Group S.r.l.


Lei L.,South China University of Technology | Bai Y.,South China University of Technology | Liu J.,South China University of Technology | Liu J.,Key Laboratory of Fuel Cell Technology of Guangdong Province | Liu J.,Key Laboratory of New Energy Technology for Guangdong Universities
Journal of Power Sources | Year: 2014

In order to reduce the sintering temperature of Ni-based anode-supported thin 8 mol% yttria-stabilized zirconia (YSZ) elsectrolyte solid oxide fuel cells (SOFCs), alumina, with a weight percent of 1, 3, 5, and 7, is respectively doped into YSZ as sintering aid. A pure YSZ buffer layer is introduced between the Al2O3-doped-YSZ electrolyte and Ni-YSZ anode, to prevent Al2O3 and NiO from forming non-conductive spinel NiAl2O4. The experimental results show that doping proper amount of Al2O3 doping can reduce the sintering temperature of YSZ, e.g., 1 wt.% doping decreases the temperature from 1673 K to 1573 K. Anode-supported SOFCs are prepared with Al2O 3-doped-YSZ electrolytes sintered at different temperatures. Electrochemical characterization of the SOFCs shows that the single cell with 1 wt.% alumina-doped YSZ electrolyte sintered at 1573 K gives the highest output. The effect of alumina doping on sintering behavior and electrical performance of YSZ is discussed in detail. © 2012 Elsevier B.V. All rights reserved.

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