Review of Sol–Gel Derived Mixed Metal Oxide Thin Film Coatings with the Addition of Carbon Materials for Selective Surface Applications

Millar, A.; Rahman, M. Mahbubur; Jiang, Zhong‐Tao

doi:10.1166/jap.2014.1131

Cited by 22 publications

(27 citation statements)

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“…The solar absorptance and the thermal emittance of a material can be calculated from measurements of reflectance data from the visible and infrared ranges of the solar spectrum [31]. The total solar absorptance (α) and thermal emittance (ε) of the coatings were estimated via Beckmann-Duffie method as described in Ref.…”

Section: Ftir Reflectance Studiesmentioning

confidence: 99%

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Structural and optical characteristics of pre- and post-annealed sol-gel derived CoCu-oxide coatings

Miran

Rahman

Jiang

et al. 2017

Journal of Alloys and Compounds

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Sol-gel derived CuCo-oxide coatings as solar selective surfaces, synthesized onto aluminium substrates at various annealing temperatures, are analysed by correlating their structural, chemical bonding states, and surface morphological topographies. As the annealing progressed, all the coatings displayed a Cu 0.56 Co 2.44 O 4 (ICSD 78-2175) phase with preferential orientation along (400) reflection plane. Rietveld refinement of X-ray diffraction (XRD) data indicate that residual stress and microstrains developed around the coating surfaces are reduced resulting in mechanically stable thin films. Enhancement of the crystallite size and preferred orientation of the surface were confirmed via XRD, field emission scanning electron microscopy (FESEM), and atomic force microscopy (AFM) analysis. X-ray photoelectron spectroscopy (XPS) analysis shows tetrahedral, octahedral and mixed states of Cu and Co ions with a stable atomic ratio of Co/Cu, and an increase of O and C contents but no metal-carbon bonding on the surface of materials. Optical reflectance investigations indicated that solar selectivity of the coatings increased from 3.81 to 24 as the annealing temperature reached up to 500 °C.

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Section: Ftir Reflectance Studiesmentioning

confidence: 99%

“…The total solar absorptance (α) and thermal emittance (ε) of the coatings were estimated via Beckmann-Duffie method as described in Ref. [31]. The solar selectivity (s), the ratio of…”

Section: Ftir Reflectance Studiesmentioning

confidence: 99%

Structural and optical characteristics of pre- and post-annealed sol-gel derived CoCu-oxide coatings

Miran

Rahman

Jiang

et al. 2017

Journal of Alloys and Compounds

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“…films were deposited on commercial grade aluminium substrates using a sol-gel dip-coating 34 technique at an annealing temperature of 500 °C in air for 1 h. Characterizations of the 35 synthesized films were carried out by high temperature synchrotron radiation X-ray Diffraction…”

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confidence: 99%

“…Thus, the direct transition energy gap (direct band-gap energy) can be obtained by plotting h vs the solar spectrum [35] . For a range of solar wavelengths, the total solar absorptance, α is defined 208 as a weighted fraction between absorbed radiation and incoming solar radiation (I sol ), while 209 thermal emittance, ε is defined as a weighted fraction between emitted radiation and the Planck 210 black-body distribution (I p ) and can be computed using Eqs.…”

mentioning

confidence: 99%

“…The copper-396 cobalt films deposited on the aluminium substrate significantly exhibit higher degree of solar 397 absorption compared to that deposited on a glass substrate [6] . A rough surface results in a the coatings was calculated in terms of reflectance as described by Duffie and Beckman [35] and 404 the corresponding solar selectivity was computed. Results of such calculations are displayed in 405 Table 6.…”

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Structural Thermal Stability of Graphene Oxide-Doped Copper–Cobalt Oxide Coatings as a Solar Selective Surface

Rahman

Jiang

Yin

et al. 2016

Journal of Materials Science & Technology

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Reduced Graphene Oxide–Based Spectrally Selective Absorber with an Extremely Low Thermal Emittance and High Solar Absorptance

et al. 2020

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Carbon‐based black materials exhibit strong solar absorptance (αsolar >0.90), which play key roles in transforming solar energy into available power for solar‐thermal, thermophotovoltaic, thermoelectric, and many other systems. However, because of high thermal emittance (>95%), these carbon‐based materials always cause huge energy loss that hinders the solar‐thermal conversion efficiency tremendously. In this study, a reduced graphene oxide–based spectrally selective absorber (rGO‐SSA) is demonstrated, which possesses a recorded low thermal emittance (≈4%) and high solar absorptance (αsolar ≈ 0.92) by easily regulating the reduction level of inner 2D graphene sheets. Compared to conventional carbon‐based black materials, thermal emittance of this rGO‐SSA is largely reduced by ≈95.8% and the cutoff wavelength of rGO‐SSA is broadband‐tunable that can range from 1.1 to 3.2 µm. More importantly, this simply sol‐gel coated rGO‐SSA has high temperature tolerance at 800 °C for 96 h that is hardly achieved by other cermet‐based or photonic‐based SSAs. Based on this rGO‐SSA, ultrafast solar steam escape (0.94 mg cm−2 s−1) under concentrated solar irradiance is achieved directly. The insight from this study will provide a new strategy for constructing thermally stable carbon‐based SSAs and greatly facilitate the solar‐thermal practical significance.

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Review of Sol–Gel Derived Mixed Metal Oxide Thin Film Coatings with the Addition of Carbon Materials for Selective Surface Applications

Cited by 22 publications

References 0 publications

Structural and optical characteristics of pre- and post-annealed sol-gel derived CoCu-oxide coatings

Structural and optical characteristics of pre- and post-annealed sol-gel derived CoCu-oxide coatings

Structural Thermal Stability of Graphene Oxide-Doped Copper–Cobalt Oxide Coatings as a Solar Selective Surface

Reduced Graphene Oxide–Based Spectrally Selective Absorber with an Extremely Low Thermal Emittance and High Solar Absorptance

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