Platinum-palladium-platinum/manganese dioxide/graphene laminated catalyst and preparation method therefor

A structural catalyst, manganese dioxide technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the poisoning of precious metal electrocatalysts, loss of catalyst carrier value, Reduce catalyst loading points and other issues, achieve excellent electrochemical performance, improve CO poisoning resistance, and facilitate adsorption and oxidation.

Active Publication Date: 2015-11-04
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene is prone to agglomeration during the pre-treatment process, which will greatly reduce its surface area, thereby reducing the loading point of the catalyst and losing its value as a catalyst carrier.
[0005] In addition, the existin

Method used

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  • Platinum-palladium-platinum/manganese dioxide/graphene laminated catalyst and preparation method therefor
  • Platinum-palladium-platinum/manganese dioxide/graphene laminated catalyst and preparation method therefor
  • Platinum-palladium-platinum/manganese dioxide/graphene laminated catalyst and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0036] First, 15 mg of graphene oxide prepared by the modified hummers method was dissolved in 30 mL of deionized water, and ultrasonicated for 1 hour to obtain a yellow-brown uniform suspension. Then, with vigorous stirring, 1 mL of 0.05M potassium permanganate solution was quickly added, and the resulting mixed solution was stored at room temperature for 12 hours. After centrifugation, wash with deionized water and dry. A manganese dioxide-doped graphene oxide composite (MnO 2 / GO). Dissolve 1 mg of the complex prepared above in 1 mL of deionized water to obtain 1 mg / mL of MnO 2 / GO solution, sonicated for 1 hour. Immerse the three-electrode system (glassy carbon electrode, saturated calomel electrode and platinum wire electrode) in the solution, carry out cyclic voltammetry scanning, scan speed 25mV / s, scan 10 laps, obtain the graphene modification of manganese dioxide doping electrode (MnO 2 / G). Immerse the prepared electrode in 1mM chloroplatinic acid solution, and...

Embodiment 2

[0045] First, 15 mg of graphene oxide prepared by the modified hummers method was dissolved in 30 mL of deionized water, and ultrasonicated for 1 hour to obtain a yellow-brown uniform suspension. Then, with vigorous stirring, 1 mL of 0.05M potassium permanganate solution was quickly added, and the resulting mixed solution was stored at room temperature for 12 hours. After centrifugation, wash with deionized water and dry. A manganese dioxide-doped graphene oxide composite (MnO 2 / GO). Take 1mg of the above-prepared MnO 2 / GO was dissolved in 2 mL of deionized water to obtain 0.5 mg / mL of MnO 2 / GO solution, sonicated for 1 hour. Immerse the three-electrode system (glassy carbon electrode, saturated calomel electrode and platinum wire electrode) in the solution, carry out cyclic voltammetry scanning, scan speed 50mV / s, scan 30 circles, obtain the graphene modification of manganese dioxide doping the electrodes. Immerse the prepared electrode in 2mM chloroplatinic acid sol...

Embodiment 3

[0047] First, 15 mg of graphene oxide prepared by the modified hummers method was dissolved in 30 mL of deionized water, and ultrasonicated for 1 hour to obtain a yellow-brown uniform suspension. Then, with vigorous stirring, 1 mL of 0.05M potassium permanganate solution was quickly added, and the resulting mixed solution was stored at room temperature for 12 hours. After centrifugation, wash with deionized water and dry. Obtain a manganese dioxide doped graphene oxide composite MnO 2 / GO. Take 1.5mg of the above prepared MnO 2 / GO was dissolved in 2 mL of deionized water to obtain 0.75 mg / mL of MnO 2 / GO solution, sonicated for 1 hour. The three-electrode system (glassy carbon electrode, saturated calomel electrode and platinum wire electrode) was immersed in the solution, and a cyclic voltammetry scan was performed at a scan rate of 100mV / s for 20 cycles to obtain a manganese dioxide-doped graphene-modified The electrode MnO 2 / G. Immerse the prepared electrode in a 3...

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Abstract

The invention discloses a platinum-palladium-platinum/manganese dioxide/graphene laminated catalyst and a preparation method therefor. The main process of the method comprises the following steps: firstly preparing an oxidized graphene (GO) solution as a carrier and a reducing agent, and obtaining a manganese dioxide doped oxidized graphene compound (MnO2/GO) after oxidation of potassium permanganate; then adopting cyclic voltammetry to electrochemically reduce the MnO2/GO so as to prepare a manganese dioxide/graphene modified electrode (MnO2/G); and soaking the MnO2/G modified electrode in chloroplatinic acid, palladium chloride and chloroplatinic acid solutions in sequence to perform cyclic voltammetry scanning, and electrochemically depositing platinum, palladium and platinum nanoparticles so as to obtain the platinum-palladium-platinum/manganese dioxide/graphene laminated catalyst (PtPdPt/MnO2/G) of a sandwich structure. The catalyst has the advantages that the experiment is simple and practicable; no other poisonous reagent or surface active agent is used in the experimental process, and the process is environment-friendly and healthy; the size and thickness of the catalyst can be adjusted and controlled through the concentration of a deposition fluid and scanning parameters; and the obtained catalyst is excellent in catalytic performance and stability for methanol oxidation.

Description

technical field [0001] The invention belongs to the field of composite catalyst preparation, in particular to a platinum palladium platinum / manganese dioxide / graphene layered structure catalyst and a preparation method. Background technique [0002] Direct Methanol Fuel Cell (DMFC) has been widely researched and applied due to its wide range of fuel sources, simple structure, high energy density, and environmental friendliness. The precious metal platinum is the most commonly used anode catalyst material in direct methanol fuel cells because of its good adsorption capacity for methanol, and its catalytic performance and stability for methanol. However, in the process of platinum catalyzing the oxidation of methanol, intermediate products such as carbon monoxide will be produced. These intermediate products will be adsorbed on the surface of platinum and occupy active sites, thereby reducing the catalytic performance of platinum. Secondly, the price of platinum is too expensi...

Claims

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Application Information

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IPC IPC(8): B01J23/656H01M4/90
CPCY02E60/50
Inventor 王宗花谢文富张菲菲杨敏夏建飞夏延致
Owner QINGDAO UNIV
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