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Pt/Fe3O4-CeO2 composite material and its preparation method and use

A fe3o4-ceo2, composite material technology, applied in the direction of material electrochemical variables, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of weak conductivity, poor catalytic activity, etc., achieve low cost, reduce solubility, Simple preparation method

Inactive Publication Date: 2013-07-10
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although CeO 2 Ce exists 3+ with Ce 4+ reversible redox reaction, but its conductivity is weak and its catalytic activity is poor

Method used

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  • Pt/Fe3O4-CeO2 composite material and its preparation method and use
  • Pt/Fe3O4-CeO2 composite material and its preparation method and use
  • Pt/Fe3O4-CeO2 composite material and its preparation method and use

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preparation example Construction

[0021] see figure 1 , showing the Pt / Fe of the embodiment of the present invention 3 o 4 -CeO 2 A method for preparing a composite material, the method comprising the steps of:

[0022] S01: Nano-CeO 2 Disperse in water with a concentration of 0.10-0.15mol / L, vibrate ultrasonically, add concentrated hydrochloric acid and soluble Fe to the solution in sequence 3+ Salt and Fe 2+ salt, to obtain a mixed system, wherein the mass of concentrated hydrochloric acid is CeO 2 2% by mass of aqueous solution, Fe 3+ Salt and Fe 2+ The molar ratio of salt is 2:1, Fe 3+ The concentration of salt in the system is 0.8-1.0mol / L;

[0023] S02: Add ammonia solution to the above mixing system and continue to stir for 20 to 40 minutes to obtain Fe 3 o 4 -CeO 2 nanocomposites;

[0024] S03: the Fe 3 o 4 -CeO 2 The nanocomposite material is prepared into a dispersion liquid with a mass concentration of 2.0mg / mL~2.5mg / mL, and mixed with H 2 PtCl 4 The aqueous solution was mixed, and...

Embodiment 1

[0033] 20mg CeO 2 Disperse in 20mL water to make the concentration 1mg / mL, ultrasonically shake for 30 minutes, then add 0.4mL concentrated hydrochloric acid, 216mg FeCl 3 ·6H 2 O and 80 mg FeCl 2 4H 2 O, sonicate to make it evenly mixed, then slowly add 100mL of 1mol / L ammonia solution to the above system, stir mechanically for 30 minutes, and centrifuge to obtain Fe 3 o 4 -CeO 2 nanocomposites. The above-prepared Fe 3 o 4 -CeO 2 The nanocomposites were dispersed in 5 mL double-distilled water, and 2 mL H 2 PtCl 4 (1%, w / w) solution and mix well. Slowly add 1mL NaBH 4 (5%, w / w) solution H 2 PtCl 4 Reduction to Pt nanoparticles. At this time, Pt nanoparticles supported on Fe 3 o 4 -CeO 2 surface. Precipitate by centrifugation to get Pt / Fe 3 o 4 -CeO 2 composite material.

Embodiment 2

[0035] First, the glassy carbon electrode (GC, 3-mm in diameter) was polished in sandpaper and alumina slurry, then ultrasonically cleaned in acetone and ethanol for 5 min, and finally ultrasonically cleaned with distilled water to obtain a bare glassy carbon electrode with a clean surface. The synthesized Pt / Fe 3 o 4 -CeO 2 Disperse in water and disperse by 10-min short-term ultrasonic dispersion to form a uniform dispersion with a concentration of 1 mg / mL. Drop 6 μL of dispersion solution on the surface of a clean bare glassy carbon electrode, and obtain Pt / Fe after the water evaporates naturally at room temperature 3 o 4 -CeO 2 Modified electrodes. The counter electrode is a platinum electrode, and the reference electrode is a saturated calomel electrode, forming a three-electrode electrochemical system.

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Abstract

The invention provides a Pt / Fe3O4-CeO2 composite material and a preparation method thereof. Pt nano-particles are deposited on the surfaces of CeO2 nanoparticles coated with Fe3O4. The preparation method comprises the following steps of 1, dispersing nano-CeO2 in water to obtain a nano-CeO2 solution having a concentration of 0.10 to 0.15mol / L, 2, carrying out ultrasonic oscillation, 3, orderly adding concentrated hydrochloric acid, a soluble Fe<3+> salt and a soluble Fe<2+> salt into the nano-CeO2 solution to obtain a mixed system, wherein the weight of the concentrated hydrochloric acid is 2% of the weight of the nano-CeO2 solution; a mole ratio of the soluble Fe<3+> salt to the soluble Fe<2+> salt is 2: 1; and the concentration of the soluble Fe<3+> salt in the mixed system is in a range of 0.8 to 1.0mol / L, 4, adding an ammonia water solution into the mixed system, 5, sequentially stirring for 20 to 40min to obtain a Fe3O4-CeO2 nanocomposite material, 6, preparing the Fe3O4-CeO2 nanocomposite material into a dispersion liquid having a mass concentration of 2.0 to 2.5mg / mL, 7, mixing the dispersion liquid and a H2PtCl4 aqueous solution, and 8, adding an NaBH4 aqueous solution into the mixed solution obtained by the step 7 to obtain the Pt / Fe3O4-CeO2 composite material. The invention also provides a use of the Pt / Fe3O4-CeO2 composite material in electroactive material detection.

Description

technical field [0001] The invention belongs to the technical field of new materials, in particular to a Pt / Fe 3 o 4 -CeO 2 Composite materials and their preparation methods and applications. Background technique [0002] Composite nanomaterials refer to nanocomposite systems composed of two or more components with completely different physical and chemical properties, and each component has an interface in contact with each other. Because the composite material integrates different components with obvious performance differences in the nano system, and produces strong mutual coupling and synergistic amplification between the components at the nanoscale, the composite structure nanomaterial not only has significantly enhanced intrinsic properties, Moreover, it also exhibits many novel properties, breaking through the limitations of the performance of single-component materials, and showing excellent application prospects in the research and development of new functional m...

Claims

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Application Information

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IPC IPC(8): B01J23/89G01N27/30
Inventor 渠凤丽孙海宜孔荣梅尤进茂
Owner QUFU NORMAL UNIV
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