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Preparation method and application of graphene quantum dots-MnO2 composite catalyst

A catalyst and graphene-coated technology, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., can solve problems such as poor conductivity and insufficient stability, and achieve low cost and controllable morphology , strong anti-methanol effect

Inactive Publication Date: 2015-10-21
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MnO 2 As an ORR electrocatalyst, it faces problems such as poor conductivity and insufficient stability.

Method used

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  • Preparation method and application of graphene quantum dots-MnO2 composite catalyst
  • Preparation method and application of graphene quantum dots-MnO2 composite catalyst
  • Preparation method and application of graphene quantum dots-MnO2 composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: GQDs-1%-MnO 2 -150-6h (GQDs-1% refers to the mass fraction of GQDs in raw materials is 1%, MnO 2 -150-6h refers to MnO 2 The preparation temperature is 150°C, and the preparation time is 6h)

[0038] Step 1: 0.6322g KMnO 4 and 20mL HCl (1mol L -1) into a beaker, added deionized water to prepare a 60mL solution, stirred magnetically for 30min, then transferred to an autoclave and reacted at a constant temperature of 150°C for 6h to obtain a precipitate. The prepared precipitate was washed with deionized water and absolute ethanol, and then vacuum-dried at 80 °C for 8 h to obtain the target product MnO 2 (MnO 2 -150-6h).

[0039] Step 2: Weigh 0.0396g MnO 2 and 0.2mL GQDs solution (2g L -1 ) into a beaker, add deionized water to make a 50mL solution, stir it magnetically for 30min, then transfer it to an autoclave, and react at a constant temperature of 100°C for 24h to obtain a brownish-yellow precipitate. The obtained precipitate was cleaned step by ...

Embodiment 2

[0040] Example 2: GQDs-5%-MnO 2 -150-6h (GQDs-5% refers to the mass fraction of GQDs in raw materials is 5%, MnO 2 -150-6h refers to MnO 2 The preparation temperature is 150°C, and the preparation time is 6h)

[0041] The steps are the same as Step 1 in Example 1.

[0042] Step 2: Weigh 0.0380g MnO 2 In a clean beaker, take 1mL GQDs solution (2g L -1 ) into a beaker, then add deionized water to make a 50mL solution, stir it magnetically for 30min, transfer the uniformly dispersed solution into an autoclave, and react at a constant temperature of 100°C for 24h. The obtained precipitate was cleaned step by step with deionized water and absolute ethanol, dried in a vacuum oven at 80°C for 8 hours, cooled naturally, ground, and weighed to obtain the target product GQDs-MnO 2 (GQDs-5%-MnO 2 -150-6h).

Embodiment 3

[0043] Example 3: GQDs-10%-MnO 2 -150-6h (GQDs-10% means that the mass fraction of GQDs in raw materials is 10%, MnO 2 -150-6h refers to MnO 2 The preparation temperature is 150°C, and the preparation time is 6h)

[0044] The steps are the same as Step 1 in Example 1.

[0045] Step 2: Weigh 0.0540g MnO 2 In a clean beaker, take 3mL GQDs solution (2g L -1 ) into a beaker, then add deionized water to make a 50mL solution, stir it magnetically for 30min, transfer the uniformly dispersed solution into an autoclave, and react at a constant temperature of 100°C for 24h. The obtained precipitate was cleaned step by step with deionized water and absolute ethanol, dried in a vacuum oven at 80°C for 8 hours, cooled naturally, ground, and weighed to obtain the target product GQDs-MnO 2 (GQDs-10%-MnO 2 -150-6h).

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Abstract

The invention relates to a novel graphene quantum dots (GQDs)-MnO2 composite catalyst and a preparation method thereof. MnO2 is combined with GQDs to prepare the GQDs-MnO2 composite catalyst for the first time by using the physical and chemical characteristics of MnO2 and GQDs. The GQDs-MnO2 composite catalyst is prepared by adopting a hydrothermal technology, and structure of the composite catalyst can be regulated through regulating the content of GQDs and MnO2 and the crystal form and the nanometer dimension of MnO2 in order to change the electrocatalytic performances. The preparation method concretely comprises the following steps: 1, preparing and processing MnO2; 2, carrying out hydrothermal compounding on GQDs and MnO2; and 3, post-processing. The preparation method of the GQDs-MnO2 composite catalyst has the advantages of simplicity, economy and good repeatability. The composite catalyst has high catalysis activity on an oxygen reduction reaction, has good stability, and is suitable for being used as a fuel cell cathode catalyst.

Description

technical field [0001] The invention belongs to the field of energy materials and electrochemistry, and more specifically relates to an electrocatalyst applied to fuel cell cathode oxygen reduction reaction and a preparation method thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy. It has the advantages of high efficiency, environmental friendliness, and high reliability, and has attracted extensive attention. At present, one of the important reasons why fuel cells have not achieved large-scale commercial utilization is that the precious metal Pt catalyst used to catalyze the cathode oxygen reduction reaction (ORR) has limited reserves, high cost, and stability needs to be improved. The development of non-Pt catalysts is one of the most effective ways to solve the above problems. [0003] As a transition metal element, Mn has unique 3d electron empty orbitals, and its oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82Y30/00
CPCB82Y30/00H01M4/90Y02E60/50
Inventor 李光兰程光春刘彩娣
Owner DALIAN UNIV OF TECH
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