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Preparation method and application of graphene based porous carbon supported metallic catalyst

A metal catalyst and metal-loaded technology, applied in electrochemical generators, nanotechnology for materials and surface science, fuel cells, etc., can solve the problems of low catalyst activity and poor catalyst stability, and achieve excellent electrocatalytic performance , high catalytic activity and stability

Inactive Publication Date: 2015-07-29
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Porous carbon as a carrier can effectively improve the cycle stability of the catalyst, but the catalyst activity is not high. On the contrary, graphene as a carrier can greatly improve the activity of the catalyst, but the stability of the catalyst is poor

Method used

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  • Preparation method and application of graphene based porous carbon supported metallic catalyst
  • Preparation method and application of graphene based porous carbon supported metallic catalyst
  • Preparation method and application of graphene based porous carbon supported metallic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of graphene oxide

[0025] Adopt Hummers method to prepare graphene oxide, 230mL sulfuric acid (98%, H 2 SO 4 ) and 5g sodium nitrate (NaNO 3 ) after mixing, cool in an ice bath; when the temperature is 0°C, add 5g of graphite under stirring; after mixing for 4 to 5 hours, slowly add 30g of potassium permanganate (KMnO 4 ); react at 35°C for 2 hours, add 460mL deionized water to dilute, stir at 98°C for 15 minutes, add deionized water to dilute, and add 100mL hydrogen peroxide (30%, H 2 o 2 ); filter, wash with 2L of 5% dilute hydrochloric acid, and then wash with deionized water until neutral to obtain graphite oxide; ultrasonicate graphite oxide in water for 0.5-1 hour to obtain graphene oxide solution.

[0026] (2) Preparation of graphene-based porous silica

[0027] Add 0.03g of graphene oxide into 100mL of water, and ultrasonically disperse to form a graphene oxide solution; add 0.04g of NaOH and 1g of CTAB into 100mL of water, and ultrasonical...

Embodiment 2

[0036] (1) Preparation of graphene oxide

[0037] Adopt improved Hummers method to prepare graphene oxide, 12mL sulfuric acid (98%, H 2 SO 4 ), 2.5g potassium persulfate (K 2 S 2 o 8 ) and 2.5g phosphorus pentoxide (P 2 o 5 ) and mix, add 3g of graphite at 80°C, stir for 4 to 5 hours; cool to room temperature, dilute with deionized water, and let stand overnight; slowly add pre-oxidized graphite to 120mL of concentrated sulfuric acid at 0°C, and then slowly add 15g Potassium permanganate (KMnO 4 ), stirred at 35°C for 2 to 4 hours; after diluting with 480ml of deionized water, add 20mL of hydrogen peroxide (30%, H 2 o 2 ); filtering, washing with dilute hydrochloric acid of 1:10 (volume ratio), and then washing with deionized water to neutrality to obtain graphite oxide; ultrasonicating graphite oxide in water for 0.5 to 1 hour to obtain a graphene oxide solution.

[0038] (2) Preparation of graphene-based porous silica

[0039] Add 0.02g of graphene oxide into 100mL...

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Abstract

The invention relates to a preparation method and application of a graphene based porous carbon supported metallic catalyst. The preparation method comprises the following steps: preparing graphene based porous silicon dioxide from graphene oxide as a base; preparing graphene based porous carbon from graphene based porous silicon dioxide as a template; using graphene based porous carbon as a carrier supported metallic catalyst; centrifuging, washing and drying. The graphene based porous carbon supported metallic catalyst, provided by the invention, has an excellent electro-catalytic property and can be used as an electrode material of a fuel cell.

Description

technical field [0001] The invention relates to the preparation of a novel fuel cell electrode material, in particular to a preparation method and application of a graphene-based porous carbon-supported metal catalyst. Background technique [0002] Direct Methanol Fuel Cell (DMFC) uses methanol aqueous solution or steam methanol as fuel, does not need to reform methanol, gasoline and natural gas to produce hydrogen for power generation, and has the advantages of low temperature fast start, clean fuel and simple battery structure and other characteristics. So far, platinum (Pt) exhibits the highest electrocatalytic activity among metal catalysts constituting fuel cell cathodes and anodes (N.S.Porter, H.Wu, Z.W.Quan, J.Y.Fang, Acc.Chem.Res.2013, 46, 1867 -1877). However, Pt is scarce, expensive, and easily adsorbed CO leading to catalyst poisoning. How to improve the catalytic activity, stability and utilization efficiency of Pt has always been a major scientific issue in r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92H01M8/10B82Y30/00
CPCB82Y30/00H01M4/88H01M4/8803H01M4/8842H01M4/9083H01M4/926H01M8/10H01M8/1011Y02E60/50
Inventor 岳文博
Owner BEIJING NORMAL UNIVERSITY
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