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A carbon-based chemical heat storage nanocomposite material and its preparation method

A nanocomposite material and chemical heat storage technology, applied in the field of carbon-based chemical heat storage nanocomposite materials and their preparation, can solve problems such as inability to overcome energy storage density, and achieve high thermal cycle reliability, high safety factor, and overall transmission. The effect of improving the mass heat transfer efficiency

Active Publication Date: 2018-06-22
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN201210019839 provides a three-dimensional graphene / phase-change energy storage composite material and its preparation method, which utilizes graphene and phase-change energy storage material in-situ composite, wherein porous graphene with a three-dimensional structure is used as a heat conductor and a composite template, Organic materials with solid-liquid phase transitions are used as energy storage materials and fillers, but they still cannot overcome the inherent problems of material physical phase transitions and have low energy storage density

Method used

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  • A carbon-based chemical heat storage nanocomposite material and its preparation method
  • A carbon-based chemical heat storage nanocomposite material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0033] The 7mg / ml graphene oxide aqueous solution was obtained by the Hummer method, and 1.05gLiOH·H 2 O was added to 100ml of graphene oxide aqueous solution, and the resulting mixed solution was condensed and refluxed at 80°C for 1h, and then placed in a polytetrafluoroethylene-lined stainless steel autoclave, and water was carried out at 200°C. Thermal reaction for 12h. The freeze-dried powder was placed in a mixed atmosphere of nitrogen and water vapor with a total flow rate of 120mL / min and a relative humidity of 60%, and kept at 30°C for 30 minutes. The measured energy storage density was 990kJ / kg. figure 1 LiOH·H in Example 1 2 Transmission electron microscopy image of thermal storage nanomaterials composed of O and graphene oxide. figure 2 It is the test result of the stability of the hydration / hydrolysis cycle reaction of the carbon-based chemical heat storage nanocomposite material described in Example 1. It can be seen from the figure that the reaction rate of th...

Embodiment 2

[0035] A 7 mg / ml graphene oxide aqueous solution was obtained by the Hummer method, and 1.63 g LiOH·H 2 O was added to 100ml of the graphene oxide aqueous solution, and the resulting mixed solution was condensed and refluxed at 80°C for 1h, then placed in a polytetrafluoroethylene substrate stainless steel autoclave, and carried out at 180°C. Hydrothermal reaction 12h. The freeze-dried powder was placed in a mixed atmosphere of nitrogen and water vapor with a total flow rate of 120mL / min and a relative humidity of 60%, and kept at 30°C for 30 minutes. The measured energy storage density was 823kJ / kg.

Embodiment 3

[0037] A 7mg / ml graphene oxide aqueous solution was obtained by the Hummer method, and 0.47gLiOH·H 2 O was added to 100 ml of the graphene oxide aqueous solution, and the obtained mixed solution was condensed and refluxed at 80° C. for 1 h, and then ultrasonically reacted at 80° C. for 2 h. The freeze-dried powder was placed in a mixed atmosphere of nitrogen and water vapor with a total flow rate of 120mL / min and a relative humidity of 60%, and kept at 30°C for 30 minutes. The measured energy storage density was 705kJ / kg.

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Abstract

The invention discloses a carbon-based chemical heat storage nano-composite material and a preparation method thereof. A hydroxide hydrate with high energy storage density, which is taken as a base body of the chemical heat storage composite material, is loaded on a nano-carbon material to form the chemical heat storage composite material, wherein mass percentage of the nano-carbon material is 30-60%. The preparation method comprises the following steps: obtaining a water solution of graphene oxide through a Hummer method, adding a metallic hydroxide hydrate to the water solution of graphene oxide, and condensing and refluxing the obtained mixed solution at 80 DEG C for 1h; and complexing through a hydrothermal or ultrasonic method, carrying out freeze drying to obtain the carbon-based chemical heat storage nano-composite material. The chemical heat storage composite material disclosed by the invention solves a problem that a single active component is slow in hydration reaction rate; and by complexing the graphene oxide material, a hydration rate of hydroxide is greatly increased and overall mass transfer and heat transfer efficiency is significantly improved; and the nano-composite material is high in heat circulation reliability, good in chemical stability and high in safety coefficient.

Description

technical field [0001] The invention relates to the technical field of inorganic materials and energy saving, in particular to a carbon-based chemical heat storage nanocomposite material and a preparation method thereof. technical background [0002] Energy storage is an effective means to solve the contradiction between energy supply and demand in terms of time and space matching, and can be used to solve the contradiction between heat energy supply and demand imbalance. Wide application prospects. In today's energy crisis and increasingly serious environmental pollution, it is increasingly urgent to develop this application technology that improves energy efficiency and protects the environment. [0003] In the field of thermal energy storage, the traditional research direction at home and abroad is latent heat storage, but the problems of supercooling during phase transition, phase separation after exothermic cycle, and material stability have not been effectively resolv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/16
Inventor 黄宏宇漥田光宏杨希贤何兆红小林敬幸
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI