Hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst and preparation method

A three-dimensional composite, graphene technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the difficult controllable preparation of composite catalyst particles, reaction time long, high reaction temperature, etc., to achieve the effect of increasing the effective specific surface area, improving the utilization rate, and improving the catalytic efficiency

Active Publication Date: 2015-05-27
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solution method requires the use of surfactants as dispersants, the reaction time is longer (≥10h) or the reaction temper

Method used

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  • Hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst and preparation method
  • Hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst and preparation method
  • Hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst and preparation method

Examples

Experimental program
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Example Embodiment

[0029] Example 1

[0030] 1) Weigh 2mg graphene and disperse it in 2ml deionized water. Ultrasound in an ultrasonic cleaner for 12h to obtain 1.0mg / ml graphene suspension, then add 40μL (200nm diameter) 2.5wt% polystyrene (PS) latex nano The spherical water dispersion was sonicated in an ultrasonic cleaning machine for 20 minutes to obtain a uniform suspension of PS nanospheres / graphene.

[0031] 2) Pipette 3 μL of the above-mentioned PS nanosphere / graphene homogeneous suspension onto the surface of the glassy carbon electrode and dry it naturally to prepare a PS nanosphere / graphene three-dimensional composite material modified electrode.

[0032] 3) Connect the saturated calomel electrode, platinum wire electrode and PS nanosphere / graphene modified electrode to the electrochemical workstation, immerse it in a 1mmol / L nickel nitrate solution, and perform cyclic voltammetry in the range of -0.8~1.2V Scanning (scanning speed is 50mV / s), scanning 10 times, so that metal Ni is deposited...

Example Embodiment

[0035] Example 2

[0036] The preparation method is the same as that of Example 1, except that polypyrrole PPY nanospheres are used instead of polystyrene (PS) latex nanospheres.

Example Embodiment

[0037] Example 3

[0038] The preparation method is the same as Example 1, except that polyvinylpyrrolidone PVP nanospheres are used instead of polystyrene (PS) latex nanospheres.

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Abstract

The invention provides a hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst and a preparation method. A PtNi nano alloy of a hollow core-shell structure is uniformly loaded on the surface of graphene by virtue of an electrochemical deposition method by taking the graphene as a carrier and a polymer nanosphere as a template. The catalyst is represented by adopting a SEM and an electrochemical method. The composite catalyst is uniformly deposited among graphene sheet layers, so as to effectively prevent accumulation between graphene nanosheets, improve the dispersion degree of the catalyst and increase the active surface area of the catalyst. Test results of cyclic voltammetry and chronoamperometry show that the hollow core-shell Pt@Ni/graphene three-dimensional composite catalyst is relatively good in catalytic activity and CO poisoning resistance on methanol oxidation and also is good in stability.

Description

technical field [0001] The invention belongs to the field of catalyst preparation, in particular to a hollow core-shell PtNi / graphene three-dimensional composite catalyst and a preparation method. Background technique [0002] Direct methanol fuel cell (DMFC) is a green energy device that uses methanol as fuel to convert chemical energy into electrical energy. DMFC has the advantages of low temperature operation, high storage capacity, portability, economy and environmental protection, making it a research hotspot in fuel cells. [0003] In DMFC, Pt is usually used as an anode catalyst. The noble metal Pt is expensive, and the catalytic activity of a single metal platinum cannot meet the commercial requirements of DMFC. In addition, in the process of catalytic oxidation of methanol, it is easy to adsorb the intermediate product CO in the process of methanol oxidation, which causes Pt poisoning. Therefore, a large number of studies have been carried out on binary bimetallic...

Claims

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Application Information

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IPC IPC(8): B01J23/89H01M4/90
CPCY02E60/50
Inventor 王宗花张菲菲修瑞萍杨敏夏建飞毕赛桂日军李延辉夏延致
Owner QINGDAO UNIV
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