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Preparation method of honeycombed graphene/tungsten carbide/platinum composite electrocatalyst and application thereof

A tungsten carbide composite, electrocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, circuits, etc., can solve the problem of affecting the conductivity and stability, not high enough, chemically reducing the conductivity and stability of graphene oxide Insufficient conductivity and other problems, to achieve the effect of strong electrical conductivity and stability, high specific surface area

Active Publication Date: 2016-04-27
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current development of graphene materials still faces a series of problems to be solved, such as the insufficient conductivity and stability of chemically reduced graphene oxide, the poor hydrophilicity of pristine graphene, and the easy stacking and agglomeration of single-sheet graphene. The actual surface area of ​​tungsten carbide is not high enough, and most of the "graphene / WC / Pt" catalytic systems reported in the past failed to give full play to the high performance of graphene; the existing technology has studied the dispersion of tungsten carbide nanoparticles in graphene sheets In terms of layer structure, the prepared WC / RGO is loaded with platinum nanoparticles. However, the graphene structure finally obtained by the two-step preparation method is still a sheet structure, and there are still problems that the actual surface area of ​​the material is not high enough due to easy stacking and agglomeration. problems, thus affecting its conductivity and stability

Method used

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  • Preparation method of honeycombed graphene/tungsten carbide/platinum composite electrocatalyst and application thereof
  • Preparation method of honeycombed graphene/tungsten carbide/platinum composite electrocatalyst and application thereof
  • Preparation method of honeycombed graphene/tungsten carbide/platinum composite electrocatalyst and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Weigh 0.5g of graphene oxide, 2.0g of polymethyl methacrylate spherical template material (average diameter 3μm) and 0.1g of ammonium tungstate (calculated as W metal) and evenly disperse them in deionized water; Synchronous stirring and heating drying on a magnetic stirrer, the stirring rate is 500 rpm, the heating temperature is 80°C, and dried to a viscous slurry; the above slurry is placed in a high-temperature furnace and heated under a high-purity nitrogen atmosphere. The heating temperature is 900°C, the heating time is 2h, and the heating rate is 5°C / min; the above-mentioned heat-treated products are further pulverized and sieved to obtain a honeycomb "graphene / WC" composite.

[0044] The honeycomb "graphene / WC" composite prepared by the above method, wherein the size of the graphene honeycomb structure is about 3 μm, WC accounts for 26.7% of the total weight of the composite, the honeycomb "graphene / WC" composite The specific surface area is 526m 2 g -1 , the...

Embodiment 2

[0047] Weigh 0.5g of graphene oxide, 2.0g of polymethylmethacrylate spherical template material (average diameter 5μm) and 0.2g of ammonium tungstate (calculated as W metal) and evenly disperse in deionized water; Synchronous stirring and heating drying on a magnetic stirrer, the stirring rate is 500 rpm, the heating temperature is 80°C, and dried to a viscous slurry; the above slurry is placed in a high-temperature furnace and heated under a high-purity nitrogen atmosphere. The heating temperature is 900°C, the heating time is 2h, and the heating rate is 5°C / min; the above-mentioned heat-treated products are further pulverized and sieved to obtain a honeycomb "graphene / WC" composite.

[0048] Prepared "honeycomb graphene / WC" composite, wherein the size of the graphene honeycomb structure is about 5 μm, WC accounts for 38.5% of the total weight of the composite, and the specific surface area of ​​the honeycomb "graphene / WC" composite is 488m 2 g -1 , the conductivity is 1150...

Embodiment 3

[0050] Weigh 0.5g of graphene oxide, 2.0g of polymethyl methacrylate spherical template material (average diameter 2μm) and 0.3g of ammonium tungstate (calculated as W metal) and evenly disperse in deionized water; Synchronous stirring and heating drying on a magnetic stirrer, the stirring rate is 500 rpm, the heating temperature is 80°C, and dried to a viscous slurry; the above slurry is placed in a high-temperature furnace and heated under a high-purity nitrogen atmosphere. The heating temperature is 900°C, the heating time is 2h, and the heating rate is 5°C / min; the above-mentioned heat-treated products are further pulverized and sieved to obtain a honeycomb "graphene / WC" composite.

[0051] The prepared honeycomb "graphene / WC" composite body, wherein the size of the graphene honeycomb structure is about 2 μm, WC accounts for 52.7% of the total weight of the composite body, and the specific surface area of ​​the honeycomb "graphene / WC" composite body is 413m 2 g -1 , the ...

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Abstract

The invention belongs to the technical field of electrocatalyst preparation and specifically discloses a preparation method of a honeycombed graphene / tungsten carbide / platinum composite electrocatalyst and its application. By the adoption of a spherical template and by a high-temperature reduction method, a honeycombed ''graphene / tungsten carbide'' complex is prepared by one step. The spherical template is used as a support to load tungsten carbide and graphene onto the surface of the spherical template. As some polymeric microspheres which are rich in a carbon source and are easy for pyrolysis are selected and the spherical template is decomposed during high temperature reduction process to release carbonaceous gas, the carbonaceous gas can react with the tungsten source so as to generate honeycombed graphene / WC with ultrafine partical size. Meanwhile, the spherical template is automatically decomposed and disappears during the high temperature process. Thus, no additional step of eliminating the template is required. The three-dimensional honeycombed ''graphene / tungsten carbide'' complex has higher specific surface area, stronger conductivity and stability. The invention provides new development strategies for development of the high-performance WC-based synergistic ''low-platinum electrocatalyst''.

Description

technical field [0001] The invention relates to the technical field of electrocatalyst preparation, more specifically, to a preparation method and application of a honeycomb graphene / tungsten carbide / platinum composite electrocatalyst. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has shown broad application prospects in portable mobile power supply, automobile power supply, large fixed power generation device, etc. due to its advantages of environmental friendliness, rapid start-up, high power density and energy density. The cathode of PEMFC Oxidation-reduction reaction (ORR) is the rate-controlling step of electrocatalytic reactions, and the research and development of ORR electrocatalysts has become an important topic in the field of fuel cells. Platinum (Pt) metal is currently the ORR electrocatalyst with the best performance. However, the high price of platinum and the scarcity of resources limit its large-scale application. and commercializa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J35/04H01M4/90
CPCH01M4/9041B01J27/22B01J35/56Y02E60/50
Inventor 李泽胜刘志森李泊林李德豪
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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