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A kind of high-efficiency electrocatalyst composite material and its preparation method and application

An electrocatalyst and composite material technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve problems such as unsatisfactory catalytic activity, loss of electrocatalytic activity of support materials, uniform dispersion of nano-alloy particles, etc., to avoid rapid attenuation, High stability, stable dispersion effect

Active Publication Date: 2020-11-27
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, because the mass transfer inside the traditional graphene airgel network is often restricted by the pore wall, a rapid mass transfer process cannot be formed inside the entire airgel. Compared with the traditional graphene aerogel, the three-dimensional structure graphene There is still a lot of room for improvement in the comprehensive electrocatalytic performance of airgel-supported noble metal nanoalloy catalyst materials
At present, there are few reports on the composite materials of three-dimensional graphene-loaded nanoparticles, and it is difficult to uniformly disperse nano-alloy particles in the structure of three-dimensional graphene. The catalytic activity is not ideal, and the support material is prone to failure due to electrochemical oxidation. leading to loss of electrocatalytic activity

Method used

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  • A kind of high-efficiency electrocatalyst composite material and its preparation method and application
  • A kind of high-efficiency electrocatalyst composite material and its preparation method and application
  • A kind of high-efficiency electrocatalyst composite material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0059] Example 1 Synthesis of Hierarchically Porous Noble Metal Nanoalloy / Graphene Airgel Composite Catalyst

[0060] 1. Prepare the multi-level porous noble metal pore nano-alloy / graphene airgel composite catalyst by the following method, comprising the following steps:

[0061] (1) Synthesis of graphene oxide lamellar dispersion with rich mesoporous structure on the surface:

[0062] Synthesis of graphene oxide dispersion: Disperse 5 g of natural flake graphite, 5 g of sodium nitrate and 15 g of potassium permanganate in 150 mL of concentrated sulfuric acid, stir and react for 10 h, heat up to 95 °C for 0.5 h, then let stand , pour off the supernatant, centrifuge and wash the precipitate several times until it becomes neutral, and then peel it off into solvent water by ultrasonic dispersion for 15 min, and a uniformly dispersed graphene oxide dispersion can be obtained;

[0063] Etching and pore forming treatment: take 100 mL of 5 mg / mL graphene oxide solution, add 2.5 g of...

Embodiment 2

[0076] Example 2 Synthesis of Hierarchically Porous Noble Metal Nanoalloy / Graphene Airgel Composite Catalyst

[0077] 1. Preparation method

[0078] Other conditions of the preparation method of present embodiment catalyst are with embodiment 1, and difference is:

[0079] (1) The reducing agent is sodium borohydride;

[0080] (2) The condition of hydrothermal reaction is: 180℃ hydrothermal reaction for 6 h.

[0081] 2. Results

[0082] (1) In this example, a metal nanoparticle alloy / graphene composite airgel with a hierarchical porous structure was obtained, and its specific surface area was as high as 510 m 2 / g, has a rich pore structure, and the loading of porous noble metal nanoalloys is as high as 20 wt%.

[0083] (3) In this example, a metal nanoalloy / graphene composite airgel with a hierarchical porous structure was obtained. Taking the decomposition of formic acid as an example, its catalytic activity per unit mass and unit area is as high as 520 mA / mg and 3.55 mA...

Embodiment 3

[0085] Example 3 Synthesis of Hierarchically Porous Noble Metal Nanoalloy / Graphene Airgel Composite Catalyst

[0086] 1. Preparation method

[0087] Other conditions of the preparation method of present embodiment catalyst are with embodiment 2, and difference is:

[0088] (1) The reducing agent is ascorbic acid;

[0089] (2) The condition of hydrothermal reaction is: 180℃ hydrothermal reaction for 12 h.

[0090] 2. Results

[0091] (1) In this example, a metal nanoparticle alloy / graphene composite airgel with a hierarchical porous structure was obtained, and its specific surface area was as high as 450 m 2 / g, has a rich pore structure, and the loading of porous noble metal nanoalloys is as high as 20 wt%.

[0092] (3) In this example, a metal nanoalloy / graphene composite airgel with a hierarchical porous structure was obtained. Taking the decomposition of formic acid as an example, its catalytic activity per unit mass and unit area is as high as 510 mA / mg and 3.55 mA / cm re...

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Abstract

The invention discloses a high-efficiency electrocatalyst composite material based on graphene aerogel of a hierarchical pore structure and a preparation method and application of the material. The preparation method comprises the following steps that an oxidized graphene dispersion liquid is oxidized and etched to obtain an oxidized graphene slice dispersion liquid whose surface includes abundantpenetrating meso-structures; a reducing agent is added to implement reduced assembling, and 3D graphene hydrogel with a multi-level tunnel structure is obtained; and the3D graphene hydrogel is immersed in a metal precursor solution, freeze drying is carried out in a hydrothermal method or a high temperature pyrolysis method, and the high-efficiency electrocatalyst composite material is obtained.Via the special hierarchical pore structure, the catalytic active site of the catalyst is exposed fully, the electrolyte can wet catalyst active substances more effectively, and mass transfer in the system is accelerated in the catalytic process; the problem that the electrocatalytic activity fails due to electrochemistry oxidation failure of the support body material is solved, and the high-efficiency electrocatalyst composite material is characterized by high catalytic activity and stability and fast mass transfer.

Description

technical field [0001] The invention belongs to the technical field of nanometer material application and electrocatalyst synthesis and preparation. More specifically, it relates to a high-efficiency electrocatalyst composite material based on graphene airgel with hierarchical pore structure and its preparation method and application. Background technique [0002] Noble metals such as platinum (Pt), gold (Au), silver (Ag) and palladium (Pd) are currently one of the most widely used electrocatalyst materials, but their disadvantages such as high cost, small reserves, and poor stability severely limit their Large-scale applications of such noble metal electrocatalysts. In response to this problem, there are currently two commonly used solutions: 1) Develop non-precious metal catalyst materials whose catalytic activity is comparable to that of noble metal catalysts. Although the catalytic activity of such non-noble metal catalysts can be improved through structural design, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/38H01M4/62
CPCH01G11/24H01G11/38H01M4/62H01M4/621Y02E60/10
Inventor 刘卫杨静郑治坤王红蕾胡鹏毕冬勤杨振宇韩治际朱庭顺
Owner SUN YAT SEN UNIV
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