Time filter

Source Type

He C.,Sun Yat Sen University | Shu D.,Power Generation in Guangdong Universities | Su M.,Sun Yat Sen University | Xia D.,Sun Yat Sen University | And 3 more authors.
Desalination | Year: 2010

A series of metal (Pt, Ag, and Cu)-deposited TiO2 films with nanocrystalline structure was prepared. Compared with TiO2 film, the degradation efficiency of formic acid for the metal-deposited TiO2 films was significantly higher in both photocatalytic (PC) and photoelectrocatalytic (PEC) processes, the enhanced order in PC and PEC activity for the metal-deposited film is Pt-TiO2 > Ag-TiO2 > Cu-TiO2. However, the electrochemical dissolution of deposited metals (Ag, and Cu) on TiO2 film would be a technical problem in PEC processes, an alternate PC and PEC processes intermittently provide a positive approach to maintain deposited metals (Ag, and Cu) on the TiO2 films well. © 2009 Elsevier B.V. All rights reserved.

Rao M.M.,South China Normal University | Liu J.S.,South China University of Technology | Li W.S.,South China Normal University | Liao Y.H.,South China Normal University | And 3 more authors.
Journal of Solid State Electrochemistry | Year: 2010

Nano-Al 2O 3 was doped in poly(acrylonitrile-co-methyl methacrylate) (P(AN-co-MMA)), and polyethylene(PE)-supported P(AN-co-MMA)/nano-Al 2O 3 microporous composite polymer electrolyte (MCPE) was prepared. The performances of the prepared MCPE for lithium ion battery use, including ionic conductivity, electrochemical stability, interfacial compatibility, and cyclic stability, were studied by scanning electron spectroscopy, linear sweep voltammetry, and electrochemical impedance spectroscopy. It is found that the nano-Al 2O 3 significantly affects the MCPE performances. Compared to the MCPE without any nano-Al 2O 3, the MCPE with 10 wt.% nano-Al 2O 3 reaches its best performances. Its ionic conductivity is improved from 2.0×10 -3 to 3.2×10 -3 S cm -1, its decomposition potential is enhanced from 5.5 to 5.7 V (vs Li/Li +), and its interfacial resistance on lithium is reduced from 520 to 160 Ω cm 2. Thus, the battery performance is improved. © 2009 Springer-Verlag.

Li J.,South China Normal University | Sun F.,South China Normal University | Sun F.,Power Generation in Guangdong Universities | Gu K.,South China Normal University | And 4 more authors.
Applied Catalysis A: General | Year: 2011

Spindly cupric oxide (CuO) micro-particles were synthesized using Cu(NO3)2, hexamethylenetetramine, and NaOH solutions at 95 °C. The spindly CuO particles had a shape similar to a carambola of ∼1 μm in length and 300 nm in width. They were composed of nanosheets with a thickness of ∼5 nm. Such particles could be used in the photocatalytic degradation of rhodamine B in the presence of ∼0.01 M H2O 2. Under irradiation by a 100 W halogen tungsten lamp, the CuO showed photocatalytic activities higher than those of P25 and commercially available CuO powder. They were very stable and could be recycled without considerable loss of activity. Other dye and organic pollutants such as methyl orange, methylene blue, erosin B, and p-nitrophenol could also be photodecomposed under identical conditions. These characteristics show the practical applications of the CuO particles in environmental remediation. © 2011 Elsevier B.V.

Lu D.-s.,South China Normal University | Lu D.-s.,Power Generation in Guangdong Universities | Li W.-s.,South China Normal University | Li W.-s.,Power Generation in Guangdong Universities | And 2 more authors.
Electrochemistry Communications | Year: 2010

The effect 8-hydroxyquinoline (8-HQ) additive in electrolyte on the cyclic stability of Co-B alloy electrode was investigated at elevated temperature (55 °C). Charge-discharge measurements show that 8-HQ can drastically enhance the cycle life of Co-B alloy electrode. Specifically, in the electrolyte containing 0.028 M 8-HQ additive, the discharge capacity of Co-B alloy electrode after 100 cycles are still up to 385.8 mAh/g at 55 °C. However, for the electrode in 8-HQ-free electrolyte, its discharge capacity is sharply decreased to only 138.5 mAh/g after 100 cycles. ICP-OES, XRD and ATR/FT-IR measurements were used to clarify the reason of the improvement in the cyclic stability. These results show that beneficial effect of 8-HQ on cycle life of Co-B alloy electrode can be attributed to the formation of insoluble complex (8-HQ)2Co(II)·2H2O protective layer that can suppress the dissolution of Co(OH)2 into electrolyte at elevated temperature. © 2009 Elsevier B.V. All rights reserved.

Chen M.,Power Generation in Guangdong Universities | Li H.,Power Generation in Guangdong Universities | Li Q.,Power Generation in Guangdong Universities | Xu Z.,Power Generation in Guangdong Universities
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2010

The luminescence properties of [Ru(bpy)2MDHIP]2+ (bpy = 2,2′-bipyridine, MDHIP = 2,4-dihydrophenyl-imidazo[4,5-f][1,10]phenanthroline) in the absence and presence of DNA modulated by the introduction of Cu2+ ion and EDTA have been investigated. It is found that the ruthenium(II) complex can insert and stack between the base pairs of calf thymus DNA with MDHIP ligand, and the intramolecular hydrogen bond is located inside of the DNA. The presence of DNA can enhance the luminescence intensities of [Ru(bpy)2MDHIP]2+ both in buffer solution and on an ITO surface. Moreover, the luminescence intensities of [Ru(bpy)2MDHIP]2+ and DNA-bound [Ru(bpy)2MDHIP]2+ are quenched by Cu2+, and next recovered by the addition of EDTA. The repetitive luminescence-modulations have been achieved through the introduction of equimolar Cu2+ and EDTA, respectively. In addition, it becomes evident that the number of luminescence-modulation cycles for [Ru(bpy)2MDHIP]2+ in the absence and presence of DNA is influenced by the cumulative concentrations of CuEDTA, generated successively by the strong coordination of Cu2+ to EDTA. © 2010 Elsevier B.V. All rights reserved.

Discover hidden collaborations