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Preparation method of high-activity porous LaMnO3+delta electrocatalyst

An electrocatalyst and high-activity technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of increasing raw material costs, impurities in products, and low catalytic activity and other problems, to achieve the effect of simple preparation method, simple equipment and excellent catalytic performance

Inactive Publication Date: 2015-08-05
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, most of the products are conventional LaMnO with the valence state of Mn element being +3 3 phase, the catalytic activity is lower than that of LaMnO 3+δ Catalyst; Second, a large amount of NaOH and other strong alkali precipitants need to be used during preparation, which causes impurities in the product and requires subsequent purification processes, which also increases the cost of raw materials

Method used

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  • Preparation method of high-activity porous LaMnO3+delta electrocatalyst

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Embodiment 1

[0038] A highly active porous LaMnO 3+δ The preparation method of electrocatalyst comprises the following steps:

[0039] Weigh 0.43g La(NO 3 ) 3 ·6H 2 O, mass percent is the Mn(NO of 0.36g of 50% 3 ) 2 solution and 0.25g P123 (triblock copolymer (EO) 20 -(PO) 70 -(EO) 20 abbreviation), dissolved in 20mL ethanol, and transferred to an ultrasonic nebulizer for atomization. Under the action of the vacuum pump, the atomized small droplets enter the glass tube preheated to 480 ° C, and the powder is collected at the other end by a filter device. The powder was calcined in air at 600 °C for 4 hours to obtain porous LaMnO 3+δ electrocatalyst.

Embodiment 2

[0041] A highly active porous LaMnO 3+δThe preparation method of electrocatalyst comprises the following steps:

[0042] Weigh 0.43g La(NO 3 ) 3 ·6H 2 O, mass percent is the Mn(NO of 0.36g of 50% 3 ) 2 solution and 0.25g P123 (triblock copolymer (EO) 20 -(PO) 70 -(EO) 20 abbreviation), dissolved in 20mL ethanol, and transferred to an ultrasonic nebulizer for atomization. Under the action of the vacuum pump, the atomized small droplets enter the glass tube preheated to 480 ° C, and the powder is collected at the other end by a filter device. The powder was calcined in air at 700 °C for 4 hours to obtain porous LaMnO 3+δ electrocatalyst.

Embodiment 3

[0044] A highly active porous LaMnO 3+δ The preparation method of electrocatalyst comprises the following steps:

[0045] Weigh 0.43g La(NO 3 ) 3 ·6H 2 O, mass percent is the Mn(NO of 0.36g of 50% 3 ) 2 solution and 0.25g P123 (triblock copolymer (EO) 20 -(PO) 70 -(EO) 20 Abbreviation), dissolved in 40mL ethanol, and transferred to an ultrasonic nebulizer for atomization. Under the action of the vacuum pump, the atomized small droplets enter the glass tube preheated to 480 ° C, and the powder is collected at the other end by a filter device. The powder was calcined in air at 700 °C for 4 hours to obtain porous LaMnO 3+δ electrocatalyst.

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Abstract

The invention discloses a preparation method of a high-activity porous LaMnO3+delta electrocatalyst. The prepared porous LaMnO3+delta electrocatalyst belongs to a porous microsphere structure. The size of the microspheres is 0.2-3 mu m. The porous LaMnO3+delta electrocatalyst is composed of LaMnO3+delta nanoparticle units with the size of about 50nm, and the pore size is about 40nm. The preparation method comprises the following steps: dissolving La and Mn metal nitrates and a high polymer template in a solvent to obtain a solution, carrying out spray pyrolysis on the solution to obtain a precursor oxide, and finally, calcining the precursor at the high temperature of 600-800 DEG C for 2-8 hours. The LaMnO3+delta electrocatalyst has high specific area; the valence state of the Mn element is slightly higher than +3; and the porous LaMnO3+delta electrocatalyst has excellent performance for catalyzing oxygen reduction reaction (ORR), and can be used as a negative pole catalyst for fuel cells and metal-air cells.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials and electrode materials, in particular to a highly active porous LaMnO 3+δ Preparation method of electrocatalyst. technical background [0002] Fuel cells have attracted much attention due to their advantages of high power density, high efficiency, and environmental protection. They are one of the first choices for the new generation of electric vehicles and backup power sources. Electrocatalysts are central to the operation and cost of fuel cells. Currently commercially used electrocatalysts are noble metal catalysts such as Pt / C and PtRu / C, which are expensive and have limited reserves. [0003] Therefore, there has been an upsurge in the study of non-noble metal electrode materials in recent years. A lot of research work has shown that perovskite metal oxides have excellent catalytic oxygen reduction reaction (ORR, the cathode reaction of fuel cells) activity, especiall...

Claims

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Application Information

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IPC IPC(8): B01J23/34H01M4/92
CPCY02E60/50
Inventor 耿保友蒯龙阚二姐王文海
Owner ANHUI NORMAL UNIV
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