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Tan Y.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Tan Y.,South China University of Technology | Fu Z.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Fu Z.,South China University of Technology | And 9 more authors.
Journal of Materials Chemistry | Year: 2012

Suitable combination of organic fragments N-(3-carboxyphenyl)-4,4′- bipyridinium and m-benzene dicarboxylate affords a new type photochromic metal-viologen coordination polymer with close packed arrangements. The aggregates build an interesting stable crystalline framework showing long lived color constancy. Repeating cycles of reversible color changes are observed for the molecular switch in air upon photoirradiation. © 2012 The Royal Society of Chemistry.


Hong P.,South China University of Technology | Hong P.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Hong P.,Key Laboratory of Enhanced Heat Transfer and Energy Conservation | Luo F.,South China University of Technology | And 8 more authors.
International Journal of Hydrogen Energy | Year: 2011

Pt/C, Pd/C and PdPt/C catalysts are potential anodic candidates for electro-oxidation of formic acid. In this work we designed a miniature air breathing direct formic acid fuel cell, in which gold plated printed circuit boards are used as end plates and current collectors, and evaluated the effects of anode catalysts on open circuit voltage, power density and long-term discharging stability of the cell. It was found that the cell performance was strongly anode catalyst dependent. Pd/C demonstrated good catalytic activity but poor stability. A maximum power density of 25.1 mW cm-2 was achieved when 5.0 M HCOOH was fed as electrolyte. Pt/C and PdPt/C showed poor activity but good stability, and the cell can discharge for about 10 h at 0.45 V (Pt/C anode) and 15 h at 0.3 V (PdPt/C) at 20 mA. © 2011 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Yang X.,South China University of Technology | Yang X.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Du L.,South China University of Technology | Du L.,Key Laboratory for Fuel Cell Technology of Guangdong Province | And 6 more authors.
Catalysis Communications | Year: 2012

A high-performance, gold-promoted Pd catalyst with mesoporous hollow silica spheres as support, PdAu/MHSS, was prepared using an impregnation-reduction approach. The catalyst showed 10 times higher activity than commercial Pd/C catalyst and 6 times higher activity than Pd/MHSS catalyst. The conversion of phenol was 100% within 30 min of reaction at 80 °C. The catalyst was characterized by XRD, XPS, and TEM, which revealed that its high performance may result from both the high dispersion of active components on the MHSS, caused by the addition of gold, and the interaction between palladium and gold. © 2011 Elsevier B.V. All rights reserved.


Yang X.,South China University of Technology | Yang X.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Chen D.,South China University of Technology | Chen D.,Key Laboratory for Fuel Cell Technology of Guangdong Province | And 9 more authors.
Journal of Catalysis | Year: 2012

A high-performance bimetallic catalyst with mesoporous silica nanoparticles as support, PdAu/MSN, was prepared by an organic impregnation-hydrogen reduction approach. A series of investigations were conducted to assess the effects of (i) the porous nanoparticle support on the dispersion of active components and on the catalyst's performance, (ii) the addition of gold on the dispersion of active components and the catalyst's activity, and (iii) the preparation parameters, such as solvent, pressure, and temperature, on the catalyst's activity. The active metallic components were highly dispersed, with particle size 2.5 nm. The addition of gold to the catalyst favorably promoted the hydrogenation of cinnamaldehyde. The activity of PdAu 0.2/MSN (with Au/Pd molar ratio 0.2:1) was up to four times higher than that of Pd/MSN (without Au as a promoter) and eight times higher than that of commercial Pd/C catalyst. The enhanced activity of PdAu 0.2/MSN can be attributed to the synergistic effect of Pd with the added Au and the highly dispersed active components. The ultrahigh activity, as well as its novel structure with controllable compositions, makes this catalyst very attractive for both fundamental research and practical applications. © 2011 Elsevier Ltd. All rights reserved.


Yang X.,South China University of Technology | Yang X.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Yang X.,CAS Guangzhou Institute of Energy Conversation | Huang C.,South China University of Technology | And 11 more authors.
Applied Catalysis B: Environmental | Year: 2013

A bimetallic Pd-promoted gold catalyst with mesoporous silica nanoparticles (MSNs) as support, PdAu/MSN, was prepared by an impregnation-hydrogen reduction method, and its catalysis for the base-free oxidation of benzyl alcohol was investigated. It was found that adding a small amount of Pd, with a Pd/Au atomic ratio as low as 0.05/1, can significantly decrease the size of the gold particles and thereby remarkably enhance the catalyst's activity for aerobatic oxidation. At the optimal Pd/Au atomic ratio of 0.2/1, the catalyst Pd0.2Au/MSN showed 8 times and 3 times higher activity than the monometallic catalysts Au/MSN and Pd/MSN, respectively. The prepared catalysts were comprehensively characterized by XRD, DRUV-vis, TEM, XPS, and H2-TPR to correlate the enhanced activity with the promotional effect induced by adding Pd. © 2013 Elsevier B.V.


Hong P.,South China University of Technology | Hong P.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Zhong Y.,South China University of Technology | Zhong Y.,Key Laboratory for Fuel Cell Technology of Guangdong Province | And 8 more authors.
Journal of Power Sources | Year: 2011

A miniature air-breathing direct formic acid fuel cell (DFAFC) based 4-cell stack, with a gold coated printed circuit board as the end plate and current collector, and with an independent fuel reservoir to avoid undesired interlaced electrolysis between different cells, is designed and investigated. Emphasis in the investigation is placed on design details, cell performance, dynamic response, and the stability of both the stack and individual cells. The striking difference in our cell configuration as compared with constructions reported in the literature is the existence of independent cavities as fuel reservoirs for each single cell. The outstanding merit of this particular design is the avoidance of water hydrolysis between electrodes, which is inevitable in stacks built with a shared fuel tank. A maximum power density of 56.6 mW cm -2 is achieved and 5.0 M is considered as the optimum concentration for this 4-cell stack. A single cell can discharge at 20 mA for 70 h with a voltage decline rate of only 2.7 mV h-1 while sufficient formic acid is pumped into the cell. © 2011 Elsevier B.V. All rights reserved.


Gao H.,South China University of Technology | Gao H.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Liao S.,South China University of Technology | Liao S.,Key Laboratory for Fuel Cell Technology of Guangdong Province | And 6 more authors.
Journal of Power Sources | Year: 2011

The direct ethanol fuel cell has been attracting increased attention due to its safety and the wider availability of ethanol as compared with methanol. The present work investigates the anodic oxidation of ethanol on a core-shell structured Ru@PtPd/C catalyst in alkaline media. The catalyst shows high activity toward the anodic oxidation of ethanol; with 18 wt.% ruthenium as the core and 12 wt.% PtPd (Pt:Pd = 1:0.2) as the active shell, its activity in terms of PtPd loading is 1.3, 3, 1.4, and 2.0 times as high as that of PtPd/C, PtRu/C, Pd/C, and Pt/C, respectively, indicating high utilization of Pt and Pd. The ratio of forward peak current density to backward peak current density (If/Ib) reaches 1.5, which is 1.9 times that of PtPd/C catalyst, revealing high poisoning tolerance to the intermediates in ethanol electrooxidation. In addition, the stability of Ru@PtPd/C is higher than that of Pt/C and PtPd/C, as evidenced by chronoamperometric evaluations. The catalyst is extensively characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy. The core-shell structure of the catalyst is revealed by XRD and TEM. © 2011 Elsevier B.V. All rights reserved.


Liu Q.,South China University of Technology | Liu Q.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Liao S.,South China University of Technology | Liao S.,Key Laboratory for Fuel Cell Technology of Guangdong Province | And 4 more authors.
Current Nanoscience | Year: 2012

Microspherical and uniform LiFePO4/C was successfully prepared by a spray drying method assisted with template. The materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The as-synthesized LiFePO4/C was used as cathode materials for battery evaluation. The material prepared with PVA as template possess perfect olivine structure of lithium ion battery with uniform size distribution. A sample prepared with optimum conditions achieved a capacity of 156.7 mAh g-1 at a rate of 0.1 C, and no obvious degradation can be observed after 15 cycles at various rates. It was found that the template affected the structure and performance of the material significantly, the addition of polyvinyl alcohol (PVA) as template resulted in uniform microsphere morphology and high performance. © 2012 Bentham Science Publishers.


Jin C.,Soochow University of China | Jin C.,University of South Carolina | Jin C.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Yang Z.,University of South Carolina | And 3 more authors.
Electrochemistry Communications | Year: 2012

La0.6Sr1.4MnO4 (LSMO4) layered perovskite with K2NiF4 structure was prepared and evaluated as anode material for La0.8Sr0.2Ga 0.83Mg0.17O3 - δ (LSGM) electrolyte supported intermediate temperature solid oxide fuel cells (IT-SOFCs). X-ray diffraction results show that LSMO4 is redox stability. Thermal expansion coefficient of LSMO4 is close to that of LSGM electrolyte. By adopting LSMO4 as anode and La0.6Sr 0.4Co0.8Fe0.2O3 (LSCF) as cathode, maxium power densities of 146.6, 110.9 mW cm- 2 with H2 fuel at 850, 800 °C and 47.3 mW cm- 2 with CH4 fuel at 800 °C were obtained, respectively. Further, the cell demonstrated a reasonably stable performance under 180 mA cm- 2 for over 40 h with H2 fuel at 800 °C. © 2011 Elsevier B.V. All rights reserved.


Mo Z.,South China University of Technology | Mo Z.,Key Laboratory for Fuel Cell Technology of Guangdong Province | Mo Z.,Yulin Normal University | Liao S.,South China University of Technology | And 5 more authors.
Carbon | Year: 2012

Nitrogen-doped carbon nanotube (N-CNT) arrays were prepared by chemical vapor deposition, using ferrocene as the catalyst precursor and imidazole as the carbon and nitrogen precursor. For the reduction of oxygen, the N-CNTs showed excellent electrocatalytic activity in both acidic and alkaline media. The N-CNTs were characterized by scanning and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and elemental analysis. The samples had a high nitrogen content (8.54 at.%) and a bamboo-like structure, and their activity varied according to the amount of pyridinic nitrogen they contained. © 2012 Elsevier Ltd. All rights reserved.

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