Selective properties of high-temperature stable spinel absorber coatings for concentrated solar thermal application

Atchuta, S.R.; Sakthivel, S.; Barshilia, Harish C.

doi:10.1016/j.solener.2020.02.048

Cited by 20 publications

(8 citation statements)

References 39 publications

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“…Tunable light absorption properties, along with the excellent thermal stability of aluminate spinels, give these materials great potential for photocatalytic and solar thermal applications. 66,67 Aluminate spinels are commonly used in high-temperature environments due to their excellent thermal stability. However, the desired chemical properties of these spinels are application dependent.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Vacancy-Driven Stabilization of Sub-Stoichiometric Aluminate Spinel High Entropy Oxides

et al. 2023

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Despite significant recent developments in the field of high entropy oxides, previously reported HEOs are overwhelmingly stoichiometric structures containing a single cationic site and are stabilized solely by intermixing increasing numbers of cations. For the first time, we demonstrate here that cationic vacancies can significantly increase configurational entropy and stabilize phase-pure HEOs. Aluminate spinel HEOs with AB2O4 stoichiometry are used as a model crystal structure. These spinels tolerate large divalent cation deficiencies without changing phase, allowing for high concentrations of cationic vacancies. Stoichiometric and sub-stoichiometric spinels (with A:B molar ratios <0.5), which contained various mixtures of Co, Cu, Mg, Mn, Ni, and cationic vacancies in nominal equimolar concentration, were systematically compared as a function of heat treatment temperature and number of unique cationic species. We found that the same number of cationic species were needed to stabilize both stoichiometric and sub-stoichiometric nickel-containing spinels at 800 °C calcination, as exemplified by (CoCuMgNi)Al2O4 and (CoMgNi)0.75Al2Ox samples, signifying that vacancies stabilize phase-pure spinels similarly to cations. The chromatic, structural, and chemical properties of these complex spinels were highly tunable via incorporation of cationic vacancies and multiple divalent metals, promoting their potential application as unique pigments, catalysts, and thermal coatings.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Vacancy-Driven Stabilization of Sub-Stoichiometric Aluminate Spinel High Entropy Oxides

et al. 2023

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“…In recent years, spinel materials have attracted substantial interest both in academia and industry due to their applications, such as superhard materials, 1 gas sensors, 2 solar absorbers, 3 biosensors, 4 energy storage, 5 data storage media, 6 radar absorbing materials, 7 and photocatalysts. 8 Iron chromite (FeCr 2 O 4 ) has a normal spinel structure and it is very useful for its interesting magnetic properties, wherein Fe 2+ occupies tetrahedral sites, and Cr 3+ occupies the six-fold octahedral positions.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a nanostructured iron chromite spinel in the pure form and its catalytic activity for the selective oxidation of benzene to phenol: experimental and DFT studies

et al. 2022

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“…The SSA idea was introduced at the end of 1950, and thenceforward several works have been devoted to SSA optimization [10,14]. To realize an SSA with an emissivity curve close to the ideal one, different designs have been analyzed by several authors in the past years [15,16]: nanomultilayer [17], ceramic and metal structures (known as cermet) [13], multilayers [18][19][20], photonic designs [21], structured graphene metamaterial [22], multilayered cermets [12].…”

Section: Introductionmentioning

confidence: 99%

A Selective Solar Absorber for Unconcentrated Solar Thermal Panels

et al. 2021

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A new Selective Solar Absorber, designed to improve the Sun-to-thermal conversion efficiency at mid temperatures in high vacuum flat thermal collectors, is presented. Efficiency has been evaluated by using analytical formulas and a numerical thermal model. Both results have been experimentally validated using a commercial absorber in a custom experimental set-up. The optimization procedure aimed at obtaining Selective Solar Absorber is presented and discussed in the case of a metal dielectric multilayer based on Cr2O3 and Ti. The importance of adopting a real spectral emissivity curve to estimate high thermal efficiency at high temperatures in a selective solar absorber is outlined. Optimized absorber multilayers can be 10% more efficient than the commercial alternative at 250 °C operating temperatures, reaching 400 °C stagnation temperature without Sun concentration confirming that high vacuum flat thermal collectors can give important contribution to the energy transition from fossil fuels to renewable energy for efficient heat production.

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Selective properties of high-temperature stable spinel absorber coatings for concentrated solar thermal application

Cited by 20 publications

References 39 publications

Vacancy-Driven Stabilization of Sub-Stoichiometric Aluminate Spinel High Entropy Oxides

Vacancy-Driven Stabilization of Sub-Stoichiometric Aluminate Spinel High Entropy Oxides

Preparation of a nanostructured iron chromite spinel in the pure form and its catalytic activity for the selective oxidation of benzene to phenol: experimental and DFT studies

A Selective Solar Absorber for Unconcentrated Solar Thermal Panels

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