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Application method of MnxCe(1-x)O2 nanoparticles

An application method and nanoparticle technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, electrical components, etc., can solve the problems of high cost, low catalytic activity of catalysts, complex synthesis process, etc. Achieve good electrochemical performance, high electrocatalytic activity, and improve energy density and power performance.

Active Publication Date: 2013-10-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned technology also has disadvantages such as high cost, complex synthesis process, or low catalytic activity of the catalyst.
At present, no MnO has been found at home and abroad 2 and CeO 2 Composite oxides are used to prepare the report of air electrode catalytic membrane, and the present invention prepares the Mn of the high specific surface area of ​​a kind of simple synthesis process x Ce 1-x o 2 The solid solution is used to prepare the air electrode catalytic membrane, and then the air electrode is prepared; the test shows that the air electrode using this material has good electrochemical performance. Energy density and power performance of aluminum-air batteries

Method used

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  • Application method of MnxCe(1-x)O2 nanoparticles
  • Application method of MnxCe(1-x)O2 nanoparticles
  • Application method of MnxCe(1-x)O2 nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the material molar ratio Mn: Ce=1:2, weigh 0.6g of 50% manganese nitrate solution, 0.13g of potassium permanganate, and 1.74g of cerium nitrate hexahydrate, dissolve these three compounds in deionized water, and transfer to 50 In a water bath at ℃, add 2 mol / L KOH drop by drop under magnetic stirring until the pH reaches 10, and then continue to age for 2 hours. After cooling, filter under reduced pressure, wash to obtain the precursor, and vacuum dry at 60 ℃ for 24 hours. Calcined at 350°C for 5 hours in a muffle furnace to obtain the target product. Its crystal structure is shown in figure 1 . It can be seen from the XRD curve that the prepared product belongs to CeO with cubic fluorite structure. 2 , since the radius of manganese ions is smaller than that of cerium particles, manganese ions will be inserted into CeO during the calcination process 2 A solid solution is formed in the crystal lattice, so XRD detection can only find CeO 2 characteristic ...

Embodiment 2

[0033] Weigh 0.6g of 50% manganese nitrate solution and 0.13g of potassium permanganate, without adding cerium nitrate hexahydrate, the product obtained is MnO 2 , Dissolve these two compounds in deionized water, transfer them to a 50°C water bath, add 2mol / L KOH drop by drop under magnetic stirring until the pH reaches 10, continue to age for 2 hours, and filter under reduced pressure after cooling , washed to obtain a precursor, vacuum dried at 60°C for 24 hours, and then calcined in a muffle furnace at 350°C for 5 hours to obtain the target product. The manufacturing process and testing methods of the air electrode are the same as those in Example 1. Image 6 Polarization curves of the air electrode were recorded. It can be seen from the figure that at the polarization potential of -0.55V (vsHg / HgO), the polarization current density reaches 355mA / cm 2 .

Embodiment 3

[0035] Weigh 1.74g of cerium nitrate hexahydrate, without adding manganese nitrate solution and potassium permanganate, the product obtained is CeO 2 , dissolve it in deionized water, transfer it to a 50°C water bath, add 2mol / L KOH drop by drop under magnetic stirring until the pH reaches 10, and continue to age for 2 hours. After cooling, filter under reduced pressure and wash. The precursor was obtained, dried in vacuum at 60°C for 24 hours, and then calcined in a muffle furnace at 350°C for 5 hours to obtain the target product. The manufacturing process and testing methods of the air electrode are the same as those in Example 1. Image 6 Polarization curves of the air electrode were recorded. It can be seen from the figure that at the polarization potential of -0.55V (vsHg / HgO), the polarization current density reaches 244mA / cm 2 .

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Abstract

The invention discloses an application method of MnxCe(l-x)O2 nanoparticles. The MnxCe(l-x)O2 nanoparticles are used as a catalyst for manufacturing a catalytic film of an air electrode of an aluminum air battery, wherein x is greater than 0 but less than 1. The particles are superfine nanoparticles about 5nm, and have the advantages of large specific surface area, high electric catalytic activity, good chemical stability and the like. The air electrode is compressed by the catalytic film, a waterproof ventilating film and a current collector. The polarization current of the air electrode prepared by using the catalyst at -0.55V (the reference electrode is Hg / HgO) is 469Ma / cm<2>. The voltage platform of the air electrode forming the aluminum air battery under full current constant-current discharge of 200Ma / cm<2> is 1.24V.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a Mn x Ce 1-x o 2 Nanoparticles are used as a catalyst for the method of making a catalytic membrane of an air electrode of an aluminum-air battery. Background technique [0002] Reducing the polarization potential of air electrodes and improving the catalytic activity of oxygen reduction catalysts are the research hotspots of aluminum-air batteries, and the selection and use of catalysts are the key. At present, there are many types of catalysts used on air electrodes, mainly as follows: noble metals and their alloys, such as Pt, Pd, Ag, etc.; transition metal oxides, such as MnO 2 ,Co 3 o 4 etc.; carbon materials, such as activated carbon, graphene, etc.; metal chelate types, such as porphyrins, phthalocyanines and their derivatives. Among them, noble metal catalysts are not suitable for large-scale commercial applications due to their high price, and the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B01J23/34
CPCY02E60/50
Inventor 唐有根乔航王海燕陶鹏鹏卢周广彭志光刘洪涛
Owner CENT SOUTH UNIV
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