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Wu S.,Chongqing University | Wu S.,Beihang University | Wang C.,Beihang University | Cui Y.,Beijing Solar Energy Research Institute Co.
Applied Surface Science | Year: 2014

Bismuth oxychloride (BiOCl) granular and flake-like films with specific {0 0 1} crystal facets are synthesized by a facile hydrolysis route. The percentage of reactive {0 0 1} facets is up to 97.36% in granular film and 91.69% in flake-like film, respectively. It is found that the synthesized granular film is composed by the nano grains with average size around 5-10 nm, but the flake-like film contains the flakes originated from the large nano crystals. The percentage of the {0 0 1} reactive facets and morphology of the BiOCl film can be tuned by adjusting the concentration or the pH value of the solution during the synthesis process, companied with the appearance of the (1 0 1), (1 0 2), and (1 1 0) facets. The formation mechanism of {0 0 1}-preferential orientation has been rationally explained in terms of crystal growth habit and dynamics. Photocatalytic degradation of RhB dye has been observed under UV light, representing that the flake-like film with {0 0 1} facets preferred orientation exhibits excellent photoactivity. © 2013 Elsevier B.V. Source


He Z.,Beijing Solar Energy Research Institute Co.
ICMREE 2013 - Proceedings: 2013 International Conference on Materials for Renewable Energy and Environment | Year: 2013

This paper introduces a solar raw petroleum heating system to reduce viscosity of the petroleum for its easier transport. Some aspects of design and operation are described in the paper. Natural gas, oil and water are simultaneously contained in the raw petroleum, which need to be heated up to 55°C-60°C in summer and to 68°C in winter. In order to make the system reliable, heat-pipe evacuated tube solar collectors have been used for the solar heating system. Totally 245 sets of heat-pipe evacuated tube collectors, including 1,960 tubes with total aperture area of 392 m2 are adopted. Practical operation results have shown that about 30% of daily average natural gas consumption could be saved. © 2013 IEEE. Source


Zhang Y.C.,Beijing Solar Energy Research Institute Co.
Applied Mechanics and Materials | Year: 2014

Stearic acid/silicon dioxide composite shape-stabilized phase change materials with different mass fraction of stearic acid have been successfully prepared using sol-gel methods. In such an organic/inorganic composite structure, the stearic acid was used as the filling material that is the latent heat storage phase change material (PCM), and the silicon dioxide acted as the matrix material which prevented the leakage of the melted stearic acid. The structure, morphology, thermal properties, thermal conductivity of the composite PCM were determined by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR) spectra, Scanning electron microscope (SEM) and Differential scanning calorimetry (DSC). The results show that the form-stable composite PCM has the optimal effect, preventing the leakage of stearic acid from the matrix of silicon dioxide, emerges when the composite containing 50% (mass fraction) stearic acid. The latent heat and melting temperature of the corresponding composite PCM is measured as 85.7J/g and 52.2 °C respectively. Meanwhile, the thermal conductivity of the composite PCM could be improved effectively by using silicon dioxide as a supporting material. © (2014) Trans Tech Publications, Switzerland. Source


Jia Y.,Tsinghua University | Li P.,Tsinghua University | Gui X.,Tsinghua University | Wei J.,Tsinghua University | And 6 more authors.
Applied Physics Letters | Year: 2011

We report a metal-insulator-semiconductor heterojunction solar cell by depositing a carbon nanotube film onto silicon substrate, followed by acid oxidation of the Si surface to form a thin oxide layer at the junction interface. The nanotube-oxide-Si solar cells with polymer encapsulation show stable efficiencies of above 10%, owing to enhanced photon absorption, inhibited charge recombination, and reduced internal resistance. Parallel and series connections without sacrificing cell efficiencies were demonstrated. © 2011 American Institute of Physics. Source


He Z.,Beijing Solar Energy Research Institute Co.
Energy Procedia | Year: 2014

A solar raw petroleum heating system to reduce viscosity of the petroleum for its easier piping transport is introduced in this paper. Some aspects of design and operation are described. Natural gas, oil and water are simultaneously contained in the raw petroleum, which need to be heated during its piping transport. In order to make the system reliable, advanced heat-pipe evacuated tube solar collectors have been used for the solar heating system. Practical operation results have shown that about 30% of daily average natural gas consumption could be saved. Source

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