2019
DOI: 10.1021/acsaem.8b01976
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Effects of Metal Dopings on CuCr2O4 Pigment for Use in Concentrated Solar Power Solar Selective Coatings

Abstract: 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 ratios of CuCr(2–x)Mn x O4 spinel black oxides were successfully fabricated. Mn-doped black oxide has the highest absorptivi… Show more

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Cited by 32 publications
(9 citation statements)
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“…20,21 This spinel phase has wide commercial application as catalysts in organic synthesis process, 22−24 H 2 production, 25 and photovoltaic. 25,26 Third, the copper chromate CuCrO 4 compound (space group Cmcm; Figure 1d) is also stable under pO 2 = 1 atm. 27 This phase contains chromium at oxidation degree +VI, which is toxic and prohibited in some major safety regulations, e.g., European Union regulation REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals).…”
Section: Introductionmentioning
confidence: 99%
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“…20,21 This spinel phase has wide commercial application as catalysts in organic synthesis process, 22−24 H 2 production, 25 and photovoltaic. 25,26 Third, the copper chromate CuCrO 4 compound (space group Cmcm; Figure 1d) is also stable under pO 2 = 1 atm. 27 This phase contains chromium at oxidation degree +VI, which is toxic and prohibited in some major safety regulations, e.g., European Union regulation REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals).…”
Section: Introductionmentioning
confidence: 99%
“…First, the cuprous chromite CuCrO 2 , also named “MacConnelite” in honor of the geologist Richard Bradford McConnell and occasionally noted as Cu 2 Cr 2 O 4 in older works, crystallizes in a rhombohedral structure (delafossite type, space group R 3̅ m ; Figure a) and it is one of the most encouraging candidates as transparent p-type conducting oxide in optoelectronic devices. This phase also presents interest in thermoelectric applications, catalytic/photocatalytic, photocathode in dye-sensitized solar cells (DSSCs), water splitting/H 2 production, , and multiferroic behavior. , Second, the copper chromite CuCr 2 O 4 presents a tetragonally distorted spinel structure (hausmannite type, space group I 4 1 / amd ; Figure b) at room temperature and transforms into a cubic structure (spinel type, space group Fd 3̅ m ; Figure c) through a transition involving the cooperative Jahn–Teller distortion at 580 ± 5 °C. , This spinel phase has wide commercial application as catalysts in organic synthesis process, H 2 production, and photovoltaic. , Third, the copper chromate CuCrO 4 compound (space group Cmcm ; Figure d) is also stable under p O 2 = 1 atm . This phase contains chromium at oxidation degree +VI, which is toxic and prohibited in some major safety regulations, e.g., European Union regulation REACH (Registration, Evaluation, Authorisation, and Restriction of Chemicals).…”
Section: Introductionmentioning
confidence: 99%
“…Spectrally selective absorber coatings on the receiver tube of concentrating solar power systems (CSP) should exhibit a high absorptance in the solar spectrum and low infrared emissivity at high temperature, and these properties would enable to realize the capability of spectrally selective absorbers in solar thermal systems. For an ideal spectrally selective absorber, the absorptance should be ∼0.95 in the solar spectrum with heat loss fraction of 0.05. The aforementioned criteria indicate that performance of a solar thermal system is limited not only by how efficiently the solar irradiation is captured by the absorber but also by how effectively the absorbed energy can be utilized to heat the fluid flowing through the receiver with minimal heat loss. This can be determined in terms of the heliothermal efficiency (η), which is calculated by estimating the difference between the absorbed energy by the surface and the radiated energy from the material with respect to total incident concentrated radiation. The expression of the heliothermal efficiency (η) is the following: where α is solar absorptance, ε­( T ) represents thermal emissivity of the selective coating at a temperature T , σ indicates Stefan–Boltzmann constant, and C and I are concentration factor and solar flux intensity on the earth’s surface (1000 W/m 2 ), respectively.…”
Section: Introductionmentioning
confidence: 99%
“…However, instead of the spectral absorption of the aluminium and respectively aluminium oxide, the spectral absorption of the coating was assumed on the irradiated surface. Furthermore, an hemispherical emissivity of = 0.8912 was used for the coated surface in the thermal transient analysis for heat exchange with the environment [57]. Figure 16 shows the computed distributions of irradiance and temperature distributions of a coated sample.…”
Section: Optimising Energy Input By Surface Modificationmentioning
confidence: 99%