Spectral selective light absorption structure for solar water gasification

A solar energy and selective technology, applied in the field of solar energy utilization, can solve the problems of reducing photothermal conversion efficiency, large radiation loss, complex structure, etc.

Active Publication Date: 2021-05-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some defects in the existing solar light absorption structures. For example, the absorption spectrum range of traditional noble metals is narrow, which is limited to the visible light region; Large radiation loss, thereby reducing the efficiency of light-to-heat conversion; the structure is too complex and other issues

Method used

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  • Spectral selective light absorption structure for solar water gasification
  • Spectral selective light absorption structure for solar water gasification
  • Spectral selective light absorption structure for solar water gasification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The bottom support plate 1 is made of aluminum oxide with a thickness of 1mm; the metal film 2 is made of titanium with a thickness of 240nm; the metal nano-curved four-pointed star-shaped prisms 4 with circular holes in the center are arranged in a square array 8, and the two phases The distance between the central axes of the adjacent metal nano-arc four-pointed star-shaped prism 4 is 330nm; the material of the metal nano-four-pointed star-shaped prism 4 is titanium, and the thickness of each metal nano-four-pointed star-shaped prism 4 is 170nm, and its cross section is the center Arc-sided four-pointed star with circular holes, wherein the arc-sided four-pointed star is surrounded by four arcs of the same shape, and the angle of each arc is 90°, the radius is 160nm, and the diameter of the central hole is 60nm; dielectric film The material of 3 is silicon dioxide, with a thickness of 40nm; at the center of each square 10 in the square array 8, there is a cylindrical h...

Embodiment 2

[0063] The bottom support plate 1 is made of aluminum oxide with a thickness of 1mm; the material of the metal film 2 is tungsten with a thickness of 300nm; the metal nano-curved four-pointed star-shaped prism 4 with a round hole in the center is arranged in a square array 8, and the two phases The distance between the central axes of the metal nano-curved four-pointed star-shaped prism 4 is 350nm; the material of the metal nano-curved four-pointed star-shaped prism 4 is tungsten, and the thickness of each metal nano-curved four-pointed star-shaped prism 4 is 190nm. The cross-section is an arc-sided four-pointed star with a circular hole in the center, wherein the arc-sided four-pointed star is surrounded by four arcs of the same shape, and the angle of each arc is 90°, the radius is 160nm, and the diameter of the central circular hole is 70nm The material of the dielectric film 3 uses titanium dioxide with a thickness of 50nm; at the center of each square 10 in the square arra...

Embodiment 3

[0065]The bottom support plate 1 is made of aluminum oxide, with a thickness of 4mm; the material of the metal film 2 is nickel, with a thickness of 260nm; the metal nano arc-edge four-pointed star-shaped prism 4 with a round hole in the center is arranged in a square array 8, and the two phases The distance between the central axes of the metal nano-curved four-pointed star-shaped prism 4 is 320nm; the material of the metal nano-curved four-pointed star-shaped prism 4 is nickel, and the thickness of each metal nano-curved four-pointed star-shaped prism 4 is 150nm. The cross-section is an arc-sided four-pointed star with a circular hole in the center, wherein the arc-sided four-pointed star is surrounded by four arcs of the same shape, and the angle of each arc is 90°, the radius is 140nm, and the diameter of the central circular hole is 50nm The material of the dielectric film 3 uses silicon dioxide, and the thickness is 35nm; the central position of each square 10 in the squa...

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Abstract

The invention discloses a spectral selective light absorption structure for solar water gasification. The spectral selective light absorption structure combines metal with a high dielectric constant imaginary part and a traditional dielectric medium into a special nanometer structure, realizes spectral selective absorption of sunlight, and is wide in absorption spectrum range and high in photo-thermal conversion efficiency. The spectral selective light absorption structure comprises a bottom layer supporting plate, wherein a metal film is formed on the bottom layer supporting plate, and a dielectric medium film is formed on the metal film; a square array formed by a plurality of metal nanometer arc-edge quadrangular-star-shaped prisms is formed on the dielectric medium film, and circular holes are formed in the centers of the metal nanometer arc-edge quadrangular-star-shaped prisms; and any four adjacent metal nanometer arc-edge quadrangular star-shaped prisms in the square array form one square in a surrounding mode, the center of each square is provided with a cylindrical hole penetrating through the bottom layer supporting plate, the metal film and the dielectric medium film, and the metal nanometer arc-edge quadrangular star-shaped prisms can coincide with the prisms after rotating by 90 degrees or 180 degrees or 270 degrees or 360 degrees around center shafts of the prisms.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization, in particular to a spectrally selective light-absorbing structure for solar water gasification. Background technique [0002] Freshwater resources are vital to sustain life and socio-economic development. As the world's population continues to increase and fresh water resources are increasingly scarce, the acquisition of fresh water resources has gradually become the focus of attention of the academic and industry circles. Using solar water gasification to realize seawater desalination is an effective way to obtain clean freshwater resources. Among them, one of the key steps of solar water gasification is to convert solar energy into heat energy to power water gasification. Therefore, the light-absorbing structure should absorb sunlight as much as possible and reduce light scattering and reflection. At present, researchers are mainly focusing on using solar water vaporization t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24S70/225
CPCF24S70/225Y02E10/40
Inventor 邱羽张鹏飞李庆
Owner CENT SOUTH UNIV
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