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Effects of Metal Dopings on CuCr <sub/>2</sub> O <sub/>4</sub> Pigment for Use in Concentrated Solar Power Solar Selective Coatings
摘要： The process of fabricating the solar absorbing spinel-structured CuCr2O4 black oxide pigment doped with different metals (Mn, Ni, Co, Al, Zn, and Sn) was discovered to improve the solar selective property. Manganese stands out as an ideal dopant to Copper Chromite (CuCr2O4) for highly solar absorptive pigments compared to the other metal dopings. XRD analysis confirmed that various molar ratio of CuCr(2-x)MnxO4 spinel black oxides were successfully fabricated. Mn-doped black oxide has the highest absorptivity (the lowest band gap value of 1.35 eV) among other metal doping black oxides produced by the hydrothermal synthesis. Manganese is the only dopant that suppresses reflectance peaks exhibited by the copper chromium oxide at 1 μm and 1.5 μm in the light spectrum, raising the solar absorptivity of the pigment. Different manganese doping compositions are introduced to CuCr(2-x)MnxO4 where x = 0.1, 0.25, 0.5, 1, 1.5, 1.75, and 1.9. The high selective solar absorptivity appears after 100% (x=1) manganese doping with solar absorbance 0.9874 and a Figure of Merit (FOM) value of 0.9284.
关键词： Concentrated Solar Power,Solar selective coating,Solar-absorbing pigment,Black paint,Spinel black oxide.
更新于2025-09-23 15:23:52
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[IEEE 2018 International Conference on Advanced Science and Engineering (ICOASE) - Duhok, Kurdistan Region, Iraq (2018.10.9-2018.10.11)] 2018 International Conference on Advanced Science and Engineering (ICOASE) - Characterization of Black Nickel Solar Absorber Coatings on Brass Substrates
摘要： Solar Selective coatings have radiative characteristics which vary with wavelength. They are characterized by their high absorbance (α) in the visible region and low thermal emittance (ε) (or high reflection) beyond the visible region of the sun spectra. These coatings materials are of very great importance in the field of renewable energy sources (solar energy applications). In the present study, the influence of process parameters like the current density, concentration of particles, time of deposition, the thickness of the electrodeposited nickel (Ni), etc. was investigated. The objective of the research is to study solar selective coatings used in solar thermal collectors. i.e. black nickel (B-N) coatings, electrodeposited (ED) over brass substrates. Preparation and characterization of B-N coatings over brass substrates was performed. Low-cost solar selective absorbers (ED of B-N on brass) have been obtained. Trial to get rid of some structures or materials which are harm to the environment. (i.e. car batteries, by using lead sheets from recycled car battery as an anode during ED of B-N coating) was achieved. Reflectance measurements were used to evaluate both, (α) and (ε) of the coatings. The measurements of total or diffuse reflectance of samples were performed with instruments equipped with integrating spheres. Electrodeposited (ED) of black nickel BN on brass substrate has a moderate selectivity (α /ε =2.63, when α =0.95). The durability tests were carried out in the form of elevated temperature exposure in air (250 C0), temperature cycling (30-100 C0), and humidity tests (up to 90 % RH). The coatings have been re-characterized after ageing tests, using spectrophotometry and other techniques, such as X-ray techniques. Durability testing of the ED B-N coatings indicates that they are sensitive to humidity testing. However, efficient absorbers were obtained by using low-cost technique. Durability testing of the ED B-N coatings indicates that they are sensitive to humidity testing.
关键词： Solar selective coating,Black nickel coating,Electro-deposition
更新于2025-09-04 15:30:14