Cu–ZnO@C nanoreactors studied by in situ synchrotron SAXS spectroscopy

Hong, C. I.; Kang, H. Y.; Wang, H. Paul; Lin, Wei-Hsiu; Jeng, U‐Ser; Su, Chi‐Cheung

doi:10.1016/j.elspec.2010.10.005

Cited by 7 publications

(3 citation statements)

References 9 publications

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“…[13,14] Metal nanoparticles encapsulated in carbon-shell (M@C), for example, Cu@C on the cathode increased the efficiency of the DSSC. [15,16] In the present work, nickelencapsulated carbon-shell (Ni@C) nanoparticles were prepared for a replacement of the noble Pt for the cathode. In addition, the TCO glasses recovered from the TFT-LCD wastes are used as the substrate for the conducting cathode of the DSSC.…”

Section: Introductionmentioning

confidence: 99%

Conducting glasses recovered from thin film transistor liquid crystal display wastes for dye-sensitized solar cell cathodes

Chen

Chang

Peng

et al. 2014

Environmental Technology

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Transparent conductive glasses such as thin film transistor (TFT) array and colour filter glasses were recovered from the TFT-liquid crystal display panel wastes by dismantling and sonic cleaning. Noble metals (i.e. platinum (Pt)) and indium tin oxide (ITO) are generally used in the cathode of a dye-sensitized solar cell (DSSC). To reduce the DSSC cost, Pt was replaced with nano nickel-encapsulated carbon-shell (Ni@C) nanoparticles, which were prepared by carbonization of Ni²⁺-β-cyclodextrin at 673 K for 2 h. The recovered conductive glasses were used in the DSSC electrodes in the substitution of relatively expensive ITO. Interestingly, the efficiency of the DSSC having the Ni@C-coated cathode is as high as 2.54%. Moreover, the cost of the DSSC using the recovered materials can be reduced by at least 24%.

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Section: Introductionmentioning

confidence: 99%

Conducting glasses recovered from thin film transistor liquid crystal display wastes for dye-sensitized solar cell cathodes

Chen

Chang

Peng

et al. 2014

Environmental Technology

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“…A very simple method for synthesis of nanosize-controllable core–shell particles has been developed in our laboratory. , The nanosized Cu nanoparticles encapsulated in carbon-shell (Cu@C) have been found to enhance efficiencies of dye-sensitized solar cells by enhancing the electron transfer rates in electrolytes. , In addition, within the carbon-shell which has a pore opening of 0.5 nm, the collision frequency between diffused-in reactants and encapsulated catalytic sites is highly increased. For instance, much more H 2 could be yielded from catalytic partial oxidation of methanol effected by the (Cu-ZnO)@C core- or yolk-shell nanoreactors …”

Section: Introductionmentioning

confidence: 99%

“…For instance, much more H 2 could be yielded from catalytic partial oxidation of methanol effected by the (Cu-ZnO)@C core-or yolk-shell nanoreactors. 26 Using the synchrotron X-ray at the wavelength of 0.1−0.2 nm at low angles (0.1−10°), small-angle X-ray scattering (SAXS) spectra of ordered morphology nanoparticles particularly in the size range of 5−25 nm can be determined to reveal their size and shape. 27−31 Based on the Bragg's Law, d = λ/ (2sinθ), where d is the Bragg size defined as 1/Q in SAXS regime; Q is the scattering wave vector; λ is the wavelength of X-ray; and θ is the scattering angle, the sizes of nanoparticles can be determined by fitting with the Schulz distribution function.…”

Section: ■ Introductionmentioning

confidence: 99%

Preparation of Magnetic Recoverable Nanosize Cu–Fe₂O₃/Fe Photocatalysts

Kang

Wang

2013

Environ. Sci. Technol.

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Iron based catalysts generally have the advantage of the easily operated magnetically recovery from application sites. In the present work, paramagnetic iron and copper core-shell nanoparticles having the iron fractions (X(Fe) = Fe/(Cu+Fe)) of 0.33-1.0 were prepared and characterized by in situ synchrotron X-ray absorption and scattering spectroscopy. During the temperature-programmed carbonization (TPC) of Cu(2+)- and Fe(3+)-β-cyclodextrin (CD) complexes, a rapid reduction of Cu(II) occurs at about 453 K together with a growth of the metallic copper (Cu). Iron proceeds in the distinct growth path. At 453-513 K, the Fe(III) → Fe(II) → Fe consecutive reduction is observed. The unreduced Fe(III) (7-13%) is coated on the surfaces of the Fe nanoparticles (as Fe2O3/Fe). Growth of the Fe nanoparticle is inhibited by the surface Fe2O3, while the steady growth in Cu is observed. The Cu has a size range of 14-18 nm in diameter, compared to the small Fe2O3/Fe ones (3-6 nm). Under the UV-visible light irradiation for four hours, methylene blue can be photocatalytically degraded (>90%) by the (Cu-Fe2O3/Fe)@C. The (Cu-Fe2O3/Fe)@C photocatalysts can effectively oxidize dye molecules, providing a promising alternative for dye degradation using solar energy. Recovery of the (Cu-Fe2O3/Fe)@C photocatalysts can be attained by applying external magnetic field to trap the ferromagnetic Cu-Fe2O3/Fe nanoparticles, which suggests an economically attractive process, especially applied in photocatalytic degradation of dye-contaminated wastewater.

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