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Preparation method of photothermal conversion device based on graphene glass, graphene glass and photothermal conversion device

A photothermal conversion, graphene technology, applied in heating devices, solar thermal energy, solar thermal devices and other directions, can solve the problems of limited wide-range application, difficult to achieve full-band spectral absorption, complex photothermal material preparation process, etc. The effect of improving the utilization rate of light energy, shortening the preparation time and low cost

Inactive Publication Date: 2017-11-03
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are various materials for photothermal conversion. Due to the influence of specific materials, photothermal conversion is usually limited to a certain wavelength band, such as the near-infrared region. It is difficult to achieve full-band spectral absorption.
In order to achieve wide-band light absorption and improve light energy utilization, scientists usually need to make specific designs to obtain materials with special structures as anti-reflection materials, in order to achieve high photothermal absorption efficiency, which makes photothermal materials The preparation process is more complicated, which limits its wide application

Method used

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  • Preparation method of photothermal conversion device based on graphene glass, graphene glass and photothermal conversion device
  • Preparation method of photothermal conversion device based on graphene glass, graphene glass and photothermal conversion device
  • Preparation method of photothermal conversion device based on graphene glass, graphene glass and photothermal conversion device

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: the preparation of graphene glass

[0049] Highly controllable graphene nanosheets were grown directly on the cleaned soda-lime glass substrate by plasma-enhanced chemical vapor deposition technology, and directly used in photothermal conversion devices. The specific method includes the following steps:

[0050] 1) Ordinary soda-lime glass substrate cleaning:

[0051] 2) Low temperature growth of graphene:

[0052] Low-temperature growth of graphene by direct current plasma-enhanced chemical vapor deposition (dc-PECVD). Place the cleaned glass substrate in the reaction chamber, pump the pressure of the reaction chamber below 0.2mbar, and then pass 200sccm Ar (heater purge) and 20sccm H 2 , the temperature was raised to 500-600°C; after the temperature was stabilized, 40sccm methane was introduced into the reaction chamber, and the pressure in the reaction chamber was controlled to be 5mbar; the graphene growth time was 2-15min to obtain graphene with di...

Embodiment 2

[0056] Embodiment 2: Obtaining of graphene glasses with different light-to-heat conversion efficiencies

[0057] As the height and length of the graphene nanosheets increase, the number of incident light reflections between the nanosheets increases, thereby improving the absorption efficiency of light energy. At the same time, it is also accompanied by a decrease in the transmittance of graphene glass. Ordinary soda-lime glass, as the growth substrate of graphene in the present invention, does not have any catalytic properties, indicating that the invention has wide applicability. The use of soda-lime glass as a low-cost material can reduce production costs. By adjusting different influencing parameters in the growth process, graphene glass products with different transmittances and different light-to-heat conversion efficiencies can be obtained.

[0058] Under optimized growth conditions, a series of graphene glass samples with different hydrophobicity, transmittance and sh...

Embodiment 3

[0059] Example 3: The use of graphene glass in light-to-heat conversion

[0060] The graphene glasses with different transmittances obtained in Example 2 are directly used for light-to-heat conversion without other special treatment. Indicate as Figure 3a As shown in and b, the graphene glass is placed on the foam pad, and the simulated sunlight light source is placed directly above it. By adjusting the height of the foam pad, the simulated sunlight intensity irradiated on the surface of the graphene glass is close to a sun 1kW / m 2 , Another function of the foam pad is to reduce the influence of the external environment on the graphene glass and increase the accuracy of the measurement. Real-time detection and temperature data collection of the surface temperature of graphene glass can be realized through an infrared thermal imager. Figure 3c It is the graphene glass sample with different transmittance (respectively 100%, 97%, 83%, 75%, 34%, wherein 100% is intrinsic soda-...

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Abstract

The invention discloses a method for photothermal conversion based on vertical-structure graphene growing on a common soda-lime glass substrate. The technical method comprises the following steps that graphene glass is prepared, wherein the graphene layer height in the graphene glass is 1-100 nm. A preparation method of the graphene glass comprises the steps that the substrate is provided, the glass substrate is put in a plasma reaction cavity, a carbon source is subjected to splitting decomposition to produce plasma, the plasma precipitates on the glass substrate to obtain the graphene glass, and the temperature of the plasma reaction cavity in the precipitating process is 500-600 DEG C. Compared with other photothermal conversion devices, a graphene nano-sheet having a special structure and perpendicular to the glass substrate can be obtained without special structural design. Under the irritation of sunlight, the surface temperature of the glass substrate can be increased from 25 DEG C to about 58 DEG C, and very high photothermal conversion efficiency is displayed.

Description

technical field [0001] The invention relates to the field of photothermal conversion using solar energy, in particular to a method for preparing a photothermal conversion device based on graphene glass, graphene glass and the photothermal conversion device. Background technique [0002] As the most common energy in nature, solar energy is widely distributed. It is of great practical significance to convert solar energy into various required energies according to people's needs, such as solar heating, solar power generation, and solar sterilization. Based on the special structure graphene directly grown on ordinary glass, compared with the horizontal graphene layer, the vertical structure graphene has unique structural characteristics, including large specific surface area, many active edges, special vertical three-dimensional structure, etc. There is a great application prospect in light-to-heat conversion. [0003] There are various materials for photothermal conversion. D...

Claims

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Application Information

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IPC IPC(8): C03C17/22F24J2/46
CPCC03C17/22F24S2080/014
Inventor 刘忠范慈海娜张艳锋
Owner PEKING UNIV
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