Hafnium carbide based solar absorber coatings with high spectral selectivity

Hans, Kushagra; Latha, Srinivasan; Bera, Parthasarathi; Barshilia, Harish C.

doi:10.1016/j.solmat.2018.05.005

Cited by 42 publications

(12 citation statements)

References 18 publications

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“…Such as the poly (acrylic acid‐co‐acrylamide) hydrogel electrolytes (134.1 F g −1 ), the P(acrylic acid‐co‐ Acryloyloxyethyltrimethyl ammonium chloride) electrolyte (135.2 F g −1 ) and the P(acrylamide ‐co‐alcohol ethoxylate acryloyl chloride) hydrogel electrolytes (130.3 F g −1 ) we reported earlier. Like the previous reports, the specific capacitors of both capacitors decrease with the increase of discharge current . Furthermore, with the increase of discharge current, both DC‐GPE and LiClO 4 solution show a decrease of specific capacitance.…”

Section: Resultssupporting

confidence: 81%

“…Like the previous reports, the specific capacitors of both capacitors decrease with the increase of discharge current. [32,33] Furthermore, with the increase of discharge current, both DC-GPE and LiClO 4 solution show a decrease of specific capacitance. The DC-GPE can maintain a specific capacitance of 84.2 % as the discharge current increases from 0.5 to 10.5 %.…”

Section: Ionic Transport Mechanism Of Dc-gpementioning

confidence: 99%

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Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

et al. 2020

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Excellent mechanical properties are indispensable for the wide application of supercapacitors and various wearable devices. In this article, a novel double‐crosslinked hydrogel electrolyte (DC‐GPE) is prepared by the combination of the hydrophobic association of acrylamide with the amphiphilic monomer AEO‐9‐AC and the ionic complexation of acrylic acid with Fe3+ for the first time by a two‐step method. Owing to the dual energy dissipation network, the DC‐GPE exhibits an excellent tensile strength of up to 3.1 MPa, an elongation at break of more than 900 % and a toughness of 18.1 MJ m−3, which is far beyond the currently reported hydrogel electrolyte. Moreover, the ionic conductivity of the DC‐GPE achieves as high as 40.1 mS cm−1, which is 3 times higher than the corresponding LiClO4 solution electrolyte (12.3 mS cm−1). Besides, the activated carbon‐based supercapacitor assembled by the DC‐GPE shows excellent electrochemical performance, which is superior to most activated carbon‐based supercapacitors. These results demonstrate that the DC‐GPE shows a great application prospect in wearable devices like supercapacitors. Significantly, the new dual physical cross‐linking strategy improves the contradiction between the strength and the toughness of the gel electrolyte materials. And provides a new solution for preparing high‐strength as well as high‐toughness gel electrolyte.

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Section: Resultssupporting

confidence: 81%

Section: Ionic Transport Mechanism Of Dc-gpementioning

confidence: 99%

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

et al. 2020

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“…Borides, carbides, and nitrides of transition metals, commonly known as ultra‐high‐temperature ceramics (UHTC), are usually used in high‐temperature applications because of their high melting point, high hardness, good thermal and chemical stability, good electrical, and thermal conductivity 10,11 . Among UHTCs, nitrides and carbides have been widely explored as potential solar selective materials for CSP application 12–14 . In recent years, the borides have also gained more attention 15–19 .…”

Section: Introductionmentioning

confidence: 99%

Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application

2021

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Solar selective coating with good thermal stability is the primary requirement for a concentrated solar power (CSP) plant to function with better photothermal efficiency. In recent years, ultra-high-temperature ceramic-based coatings have been explored as potential materials for solar selective coatings. In this context, NbB 2 /Nb(BN)/Al 2 O 3 tandem absorber coating was designed to be fabricated on a stainless-steel substrate by the radio frequency magnetron sputtering of spark plasma sintered ceramic target. In the bulk form, the NbB 2 ceramic exhibits high solar absorptance (α = 0.756) and thermal emissivity (ε = 0.43), whereas the amorphous single NbB 2 coating exhibits α/ε = 0.716/0.13. Reactive sputtering of NbB 2 in nitrogen produced a semi-transparent coating with an optical bandgap of ∼2.80 eV and was used as the secondary absorber layer. Raman and X-ray photoelectron spectroscopy analyses reveal mild oxygen incorporation in the absorber layers. The developed SS/NbB 2 /Nb(BNO)/Al 2 O 3 tandem absorber exhibits a good solar absorptance of 0.950 and a moderate thermal emissivity of 0.15 at room temperature. The coatings exhibited good thermal stability when heated in vacuum for 5 h up to 700 • C, and the selectivity (α/ε) remains above 6. The present work shows the possibility of exploring NbB 2 -based tandem absorber coatings for CSP applications.

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“…Due to high neutron absorption of Hf, its carbides and nitrides did not receive as much attention as zirconium counterparts for nuclear-related applications; however, they have a high potential for advanced solar energy-related applications. Partially oxidized hafnium carbide coatings showed high spectral selectivity as absorber coating for concentrated solar power systems [8], and hafnium nitride as an absorber for hot carrier solar cells [9]. For polymer electrolyte membrane fuel cells, ZrN coating was shown to significantly increase corrosion resistance and hydrophobicity of stainless steel for replacement of highly brittle graphite-based bipolar plates [10].…”

Section: Introductionmentioning

confidence: 99%

Carbides and Nitrides of Zirconium and Hafnium

et al. 2019

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Among transition metal carbides and nitrides, zirconium, and hafnium compounds are the most stable and have the highest melting temperatures. Here we review published data on phases and phase equilibria in Hf-Zr-C-N-O system, from experiment and ab initio computations with focus on rocksalt Zr and Hf carbides and nitrides, their solid solutions and oxygen solubility limits. The systematic experimental studies on phase equilibria and thermodynamics were performed mainly 40–60 years ago, mostly for binary systems of Zr and Hf with C and N. Since then, synthesis of several oxynitrides was reported in the fluorite-derivative type of structures, of orthorhombic and cubic higher nitrides Zr3N4 and Hf3N4. An ever-increasing stream of data is provided by ab initio computations, and one of the testable predictions is that the rocksalt HfC0.75N0.22 phase would have the highest known melting temperature. Experimental data on melting temperatures of hafnium carbonitrides are absent, but minimum in heat capacity and maximum in hardness were reported for Hf(C,N) solid solutions. New methods, such as electrical pulse heating and laser melting, can fill the gaps in experimental data and validate ab initio predictions.

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Hafnium carbide based solar absorber coatings with high spectral selectivity

Cited by 42 publications

References 18 publications

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application

Carbides and Nitrides of Zirconium and Hafnium

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Hafnium carbide based solar absorber coatings with high spectral selectivity

Cited by 42 publications

References 18 publications

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

Probing the spectrally selective property of NbB2‐based tandem absorber coating for concentrated solar power application

Carbides and Nitrides of Zirconium and Hafnium

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Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application