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Ping N.,Key Laboratory for Colloid and Interface Chemistry | Ping N.,Shandong University | Ping N.,Dezhou University | Jingcheng H.,Key Laboratory for Colloid and Interface Chemistry | Jingcheng H.,Shandong University
Science China Chemistry | Year: 2012

We report layer-by-layer (LbL) assembly of TiO2 and H 4SiW12O40 (SiW12) multilayer film on silicon wafers and glass slides for photocatalytic degradation of methyl orange (MO). The photocatalytic efficiency of the obtained multilayer film increases along with the decrease of pH and salt concentration of the incubation solution. The results show that MO can be almost removed in pH 2.0 solution without salt addition in the first 60 min incubation when MO concentration is lower than 15 mg/L. Different salts show an apparent inhibitory effect on photocatalytic degradation of MO with the order of ZnCl2>KCl NaCl>LiCl. The TiO2/SiW12 multilayer film maintains photocatalytic activity even after five degradation cycles. The reaction of MO photodegradation accords with an apparent first-order dynamics. © Science China Press and Springer-Verlag Berlin Heidelberg 2012. Source


Qiu C.,Key Laboratory for Colloid and Interface Chemistry | Zhang J.,Key Laboratory for Colloid and Interface Chemistry | Ma H.,Key Laboratory for Colloid and Interface Chemistry
Solid State Sciences | Year: 2010

Co thin films with novel hierarchical structures were controllably fabricated by simple electrochemical deposition in the absence of hard and soft templates, which were used as sacrificial templates to further prepare noble metal (Pd, Pt, Au) hierarchical micro/nanostructures via metal exchange reactions. SEM characterization demonstrated that the resulting noble metal thin films displayed hierarchical architectures. The as-prepared noble metal thin films could be directly used as the anode catalysts for the electro-oxidation of formic acid. Moreover, bimetallic catalysts (Pt/Au, Au/Pt) fabricated based on the monometallic Au, Pt micro/nanostructures exhibited the higher catalytic activity compared to the previous monometallic catalysts. © 2010 Elsevier Masson SAS. All rights reserved. Source


Song L.,Key Laboratory for Colloid and Interface Chemistry | Duan J.,Key Laboratory for Colloid and Interface Chemistry | Zhan J.,Key Laboratory for Colloid and Interface Chemistry
Materials Letters | Year: 2010

Aqueous soluble homogeneously alloyed CdSexTe1-x (0 ≤ x ≤ 1) semiconductor nanocrystals (NCs) were synthesized by co-reduction of sodium selenite (Na2SeO3) and sodium tellurite (Na2TeO3) at 120 °C under microwave irradiation. The optical modulation of the photoluminescence (PL) between 600 and 710 nm could be facilely demonstrated through changing molar ratios of Se to Te. The PL quantum yields (QYs) of CdSexTe1-x NCs were lower than that of CdTe NCs. On the other hand, it could be higher than that of CdSe NCs. © 2010 Elsevier B.V. All rights reserved. Source


Wang H.,Key Laboratory for Colloid and Interface Chemistry | Tian F.,Key Laboratory for Colloid and Interface Chemistry | Li X.,Key Laboratory for Colloid and Interface Chemistry | Liu F.,Key Laboratory for Colloid and Interface Chemistry | Shen Q.,Key Laboratory for Colloid and Interface Chemistry
Powder Technology | Year: 2010

In this paper, the functionalized surfactant of copper dodecyl sulfate [Cu(DS)2] was used both as the metal ion source and as the modifier to investigate the preparation and shape evolution of cuprous oxide (Cu2O). The increase of Cu(DS)2 concentration from 0.27 to 6.82 mM caused the morphological change of Cu2O crystals from the truncated cubic to the cuboctahedral, then to the coexistence of the cubic and the truncated octahedral, and finally to the truncated octahedrons. As an experimental control, the inorganic salt of copper (II) chloride was also used as the metal ion source to conduct the precipitation of Cu2O. These results indicate that the special adsorption of organic counterions (i.e., dodecyl sulfate ions) exerted a great influence on the shape control of Cu2O crystals, especially at a relatively low concentration. Meanwhile, the d-glucose concentration and the incubation time of crystals were also considered. In conclusion, the competitive adsorption of surfactant ions and d-glucose molecules onto crystalline faces, as well as the aging time, accounted jointly for the shape control of Cu2O crystals. © 2009 Elsevier B.V. All rights reserved. Source


Qiu C.,Key Laboratory for Colloid and Interface Chemistry | Shang R.,Key Laboratory for Colloid and Interface Chemistry | Xie Y.,Key Laboratory for Colloid and Interface Chemistry | Bu Y.,Key Laboratory for Colloid and Interface Chemistry | And 2 more authors.
Materials Chemistry and Physics | Year: 2010

A series of bimetallic Pd-Ni thin films with different compositions were prepared on glass carbon electrodes (GCEs) by a template-free, double-potential step electrodeposition technique and their compositions were controlled well by adjusting electrodeposition conditions, such as the concentration ratio of palladium ions to nickel ions in electrolytic solutions, nucleation time and growth time. SEM observations and EDS analyses demonstrate that the structural feature and compositions of the as-prepared Pd-Ni films varied with deposition conditions. Electrochemical characterizations indicate that electrochemical properties and electrocatalytic activity of the bimetallic Pd-Ni thin films were strongly dependent on the composition, structure and surface morphology obtained under different deposition conditions. The high catalytic activity and the low cost of the Pd-Ni films enable them to be promising electrocatalysts for the oxidation of methanol and ethanol in alkaline media. © 2009 Elsevier B.V. All rights reserved. Source

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