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Hollow CeO2 sphere@Co-N/C nanometer composite material and preparation method and application thereof

A nanocomposite material and hollow technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, fuel cells, etc., can solve obstacles to commercial applications, cathode catalyst platinum-based catalysts are expensive and stable and poor tolerance to methanol

Active Publication Date: 2019-07-05
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, platinum-based cathode catalysts that have a greater impact on fuel cell performance are expensive, and have poor stability and methanol tolerance, hindering their commercial application.

Method used

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  • Hollow CeO2 sphere@Co-N/C nanometer composite material and preparation method and application thereof
  • Hollow CeO2 sphere@Co-N/C nanometer composite material and preparation method and application thereof
  • Hollow CeO2 sphere@Co-N/C nanometer composite material and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0022] The invention provides a hollow CeO 2 The preparation method of the ball@Co-N / C nanocomposite material comprises the following steps: (1) contacting and reacting the heated cerium salt dispersed in the first solvent with polydopamine nanospheres, washing and drying the obtained product, After air gradient calcination, the hollow CeO 2 sphere; (2) in the second solvent, the hollow CeO 2 Contact reaction of spheres, cobalt source, and D-(+)glucosamine hydrochloride to prepare hollow CeO 2 spheres@Co-N / C precursor; (3) the hollow CeO 2 The sphere@Co-N / C precursor was calcined under nitrogen atmosphere to obtain the hollow CeO 2 Sphere@Co-N / C nanocomposite.

[0023] Through the above technical scheme, in the present invention, the hollow CeO 2 Contact reaction of spheres, cobalt source, and D-(+)glucosamine hydrochloride to prepare hollow CeO 2 spherical@Co-N / C precursor; the hollow CeO 2 The sphere@Co-N / C precursor was calcined under nitrogen atmosphere to obtain th...

preparation example 1

[0042] CeO 2 Preparation of nanospheres: add 0.5mmol cerium nitrate hexahydrate to 20ml of ethanol, stir at 70°C for 1h for heat treatment, add 0.05g of polydopamine nanosphere solution (containing 5mL of deionized water) after ultrasonic dispersion dropwise and move to room temperature for reaction 16h, washed 3 times, and dried overnight. Then carry out gradient calcination: calcine in air at 550°C for 3h, cool down to 400°C at 1°C / min, and maintain it for 1h, and finally get a white powder that is CeO 2 small ball. Denote it as D1.

preparation example 2

[0044] Prepare CeO according to the method of Preparation Example 1 2 , denoted as C1; the difference is that the cerium nitrate hexahydrate was replaced by an equimolar amount of cerium chloride, and the amount of the polydopamine nanosphere solution was 0.1 g.

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Abstract

The invention discloses a hollow CeO2 sphere@Co-N / C nanometer composite material and a preparation method and application thereof. The preparation method includes the steps that cerium salt and polydopamine nanoballs are in contact and react, and through air gradient calcination, hollow CeO2 balls are obtained; in a second solvent, the CeO2 balls, a cobalt source and D-(+)glucosamine hydrochlorideare subjected to contact reaction to be made into a CeO2sphere@Co-N / C precursor; the CeO2 sphere@Co-N / C precursor is calcined in a nitrogen atmosphere. The catalysis performance of the composite material is the same as that of Pt and Pt-based catalystsand is good, the cost of the catalysts can be reduced, and the composite material has stable oxygen reduction catalysis performance andmethanol resistance and can efficiently catalyze oxygen reduction reaction of a fuel cellcathode; the preparing method has the advantages of being environmentally friendly, clean, efficient, simple, low in cost and the like.

Description

technical field [0001] The invention relates to the field of composite material preparation and oxygen reduction catalysis, in particular, to a hollow CeO 2 Sphere@Co-N / C nanocomposites and their preparation methods and applications. Background technique [0002] With the depletion of energy resources and the aggravation of environmental pollution, fuel cells, as energy conversion and storage devices, have become a research hotspot today. Pt-based catalysts, non-metal-doped carbon-based catalysts, and non-noble metal-doped carbon-based catalysts are all research hotspots. However, platinum-based cathode catalysts, which have a great impact on the performance of fuel cells, are expensive, and have poor stability and methanol tolerance, which hinders their commercial application. It is particularly urgent to study fuel cell cathode ORR catalysts with low price, good stability and good methanol tolerance. [0003] The purpose of the present invention is to provide a composit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J35/10H01M4/90H01M8/1011
CPCB01J23/83H01M4/9083H01M4/9041H01M4/9016H01M8/1011B01J35/33B01J35/61Y02E60/50
Inventor 王银玲王娟张友良李雪范明丽
Owner ANHUI NORMAL UNIV
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