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Pt-CeO2/graphene electro-catalyst and preparation method thereof

An electrocatalyst, pt-ceo2 technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as the difficulty of metal nanoparticles and affect the electrocatalytic performance of catalysts, and achieve energy-saving efficiency. Effect

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this has two disadvantages: one is that the metal nanoparticles protected by the polymer are difficult to directly load on the carbon material carrier; the other is that as an electrocatalyst, the polymer protective agent must be removed at high temperature, and the high temperature treatment process Metal nanoparticles will reunite or grow up again, affecting the electrocatalytic performance of the catalyst

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  • Pt-CeO2/graphene electro-catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] 148 mg of graphite oxide nanosheets were dispersed in 150 mL of ethylene glycol by ultrasonic treatment, then 4 mL of 0.05 M chloroplatinic acid solution and 20 mL of 10 mM cerium ammonium nitrate aqueous solution were added, the molar ratio of platinum and cerium was 1:1, Then add 1.5 milliliters of 1 mol / L sodium acetate aqueous solution, the concentration of sodium acetate in the synthesis solution is 0.01 mol / L, fully stir and mix evenly. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 8 min. After cooling, filter, wash thoroughly with acetone and deionized water, and dry at 80°C to obtain Pt-CeO 2 / graphene catalyst. The platinum nano-particles in the catalyst were observed by a transmission electron microscope to have a uniform particle size, with an average particle size of 2.8 nanometers. EDX analysis showed that the mass fraction of platinum in the catalyst was 19.3% ...

Embodiment 2

[0024] 336 mg of graphite oxide nanosheets were dispersed in 300 mL of ethylene glycol by ultrasonic treatment, then 8 mL of 0.05 M chloroplatinic acid solution and 20 mL of 10 mM cerium ammonium nitrate aqueous solution were added, and the mol ratio of platinum and cerium in the solution was 2: 1. Then add 4 ml of 1mol / L sodium acetate aqueous solution, the concentration of sodium acetate in the synthesis solution is 0.013mol / L, stir well and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 10 min. After cooling, filter, wash thoroughly with acetone and deionized water, and dry at 80°C to obtain Pt-CeO 2 / graphene catalyst. The platinum nano-particles in the catalyst were observed by a transmission electron microscope to have a uniform particle size, with an average particle size of 3.0 nanometers. EDX analysis showed that the mass fraction of platinum in the catalyst was 2...

Embodiment 3

[0028] 430 milligrams of graphite oxide nanosheets are dispersed in 400 mL of ethylene glycol with ultrasonic treatment, then 10 mL of 0.05 M chloroplatinic acid solution and 20 mL of 10 mM ammonium cerium nitrate aqueous solution are added, and the mol ratio of platinum and cerium in the solution is 2.5: 1. Then add 10 ml of 1mol / L sodium acetate aqueous solution, the concentration of sodium acetate in the synthesis solution is 0.025mol / L, stir well and mix well. The homogeneous mixture was transferred to a microwave hydrothermal reaction kettle, and the reaction was heated by microwave radiation for 10 min. After cooling, filter, wash thoroughly with acetone and deionized water, and dry at 80°C to obtain Pt-CeO 2 / graphene catalyst. The platinum nano-particles in the catalyst were observed by a transmission electron microscope to have a uniform particle size, with an average particle size of 3.2 nanometers. EDX analysis showed that the mass fraction of platinum in the cat...

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Abstract

The invention discloses a Pt-CeO2 / graphene electro-catalyst which uses graphene as a carrier, platinum as an active component and CeO2 as an auxiliary component, wherein the mass fraction of the platinum contained in the Pt-CeO2 / graphene electro-catalyst is 20 percent; and the mole ratio of the platinum and cerium is 1:1-2.5:1. A preparation method of the Pt-CeO2 / graphene electro-catalyst comprises the following steps of: ultrasonically dispersing oxidized nano graphite sheets into glycol; then adding a chloroplatinic acid solution, an aqueous ammonium ceric nitrate solution and an aqueous sodium acetate solution, and sufficiently mixing; transferring a mixture to a microwave hydro-thermal reaction kettle; and after microwave hydro-thermal reaction, filtering, washing and drying to obtain the Pt-CeO2 / graphene electro-catalyst. The preparation method has energy saving, fastness, simple process, and the like; and in addition, the prepared Pt-CeO2 / graphene electro-catalyst has high electrocatalysis activity for the electrochemical oxidation of methanol and is widely used for direct methanol fuel cells.

Description

technical field [0001] The present invention relates to Pt-CeO 2 The graphene electrocatalyst and its preparation method belong to the technical field of catalyst preparation and the technical field of electrochemical energy. Background technique [0002] Direct methanol fuel cells using methanol as fuel have the advantages of high energy density, environmental friendliness, easy fuel portability, and low operating temperature, and have broad application prospects. Platinum / carbon materials with carbon-supported platinum metal nanoparticles have been widely used as electrocatalysts in fuel cells due to their excellent catalytic properties. However, the pure Pt / C catalyst is easy to adsorb the intermediate products of methanol oxidation (such as CO, etc.) during the electrocatalytic oxidation of methanol, which poisons its catalyst performance. Therefore, the synthesis of fuel cell catalysts with high catalytic activity and resistance to CO poisoning is of great significanc...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J21/18B01J37/34B01J35/10H01M4/96H01M4/90
CPCY02E60/50
Inventor 陈卫祥赵杰常焜马琳李辉
Owner ZHEJIANG UNIV
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