Brilliant yellow-orange
pigments based on the formula Bi1.7RE0.3W0.7Mo0.3O6 (RE
= Y, Yb, Gd, Lu) are developed by the traditional solid-state reaction
method. Relevant techniques are used for characterization of the
crystal structure, morphology feature, reflectance property, and color
performance of the prepared pigment. The doping of RE/Mo in Bi2WO6 results in the colors of pigments varying from
faint yellow to brilliant yellow-orange. Compared with Bi2WO6 pigment, the typical pigment of Bi1.7Lu0.3W0.7Mo0.3O6 greatly improves
the yellow hue component (b*) value to be 72.03.
Moreover, the NIR reflectances of all of the samples are higher than
95% , and their NIR solar reflectances are above 94%. The typical
pigment of Bi1.7Lu0.3W0.7Mo0.3O6 coated on galvanized sheet exhibits excellent coloring
performance with a high NIR solar reflectance (83.32%). The acid/alkali
resistance studies reveal that the pigments are chemically stable
under the atrocious weather conditions. Thus, the superior performances
of synthesized pigments have exhibited potential for energy savings.
A facile, one-step hydrothermal method was employed to synthesize two kinds of WO3 nanostructures. By using different kinds of sylvine, tungsten trioxide (WO3) with different morphologies of microflowers and nanowires was obtained, respectively. The discharge capacities for microflowers and nanowires are 107 and 146 mAh g−1 after 180 cycles, and their corresponding capacity retentions after the first cycle are 72 and 85 %, respectively. Even at a high current density of 1,600 mAh g−1, the discharge capacities of WO3 microflowers and nanowires are as high as 433 and 557 mAh g−1 after 40 cycles, in which the current densities were increased stepwise. It is worth mentioned that the rate capability of the nanowires is superior to that of the microflowers. However, the cycle performance of the microflowers is better than nanowires, revealing that the morphology and structure of the as-synthesized WO3 products can exert great influence on the electrochemical performances.
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