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Alpha-manganese dioxide nanotube, silver nanoparticle loaded alpha-manganese dioxide nanotube, and preparation method and application thereof

A nanoparticle and nanotube technology, applied in the field of air fuel cells, can solve the problem of low catalytic activity

Active Publication Date: 2018-10-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing preparation of α-MnO by hydrothermal method 2 Nano-hollow tubes suffer from low catalytic activity

Method used

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  • Alpha-manganese dioxide nanotube, silver nanoparticle loaded alpha-manganese dioxide nanotube, and preparation method and application thereof
  • Alpha-manganese dioxide nanotube, silver nanoparticle loaded alpha-manganese dioxide nanotube, and preparation method and application thereof
  • Alpha-manganese dioxide nanotube, silver nanoparticle loaded alpha-manganese dioxide nanotube, and preparation method and application thereof

Examples

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preparation example Construction

[0031] The present invention provides a kind of α-MnO 2 A method for preparing nanotubes, comprising the steps of:

[0032] (1) Potassium permanganate is mixed with water to obtain potassium permanganate solution;

[0033] (2) carry out reduction reaction after hydrochloric acid is added dropwise in the potassium permanganate solution that described step (1) obtains, obtain α-MnO 2 For nanotubes, the molar ratio of potassium permanganate to hydrochloric acid is 1:1-10.

[0034] The invention mixes potassium permanganate with water to obtain a potassium permanganate solution. The present invention has no special limitation on the concentration of the potassium permanganate solution, and any concentration of potassium permanganate solution can be used. In the present invention, the volume ratio of the mass of potassium permanganate to water is preferably 1.517g:80mL. The present invention has no special limitation on the mixing method, and a mixing method well known to those...

Embodiment 1

[0064] 1.517gKMnO 4 Dissolve in 80mL deionized water, stir evenly, weigh 3.0g 37% HCl and add dropwise to KMnO 4 solution, stirred for 30min.

[0065] Transfer the above solution to a 150mL reactor and carry out the oxidation reaction at 130°C for 10 hours. After the reaction, the reactor was naturally cooled to room temperature, centrifuged, and the precipitate was washed three times with deionized water and ethanol, and the precipitate was vacuum-dried at 100°C. 24h, get α-MnO 2 nanotube.

[0066] For the α-MnO prepared in this example 2 The nanotubes were characterized by XRD, and the results were as follows: figure 1 shown by figure 1 It can be seen that the α-MnO prepared in this example 2 Nanotube XRD diffraction patterns and a-MnO 2 (JCPDS No.44-0141, tetragonal, I4 / m, ), it is determined that the synthesized sample is a-MnO 2 square phase.

[0067] For the α-MnO prepared in this example 2 The nanotubes were characterized by SEM and TEM, and the results are ...

Embodiment 2

[0070] The preparation method is the same as that of Example 1, except that the amount of hydrochloric acid added is 2g, 5g and 7g respectively.

[0071] For the α-MnO that embodiment 1 and 2 make 2 The specific surface area of ​​nanotubes was tested, and the results are shown in Table 1. It can be seen from Table 1 that the addition of hydrochloric acid can adjust the α-MnO 2 The specific surface area of ​​nanotubes, when the added amount is 3g, the BET specific surface area reaches the maximum of 52.9030m 2 / g.

[0072] Table 1 Preparation of α-MnO with different additions of hydrochloric acid 2 BET specific surface area of ​​nanotubes

[0073]

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Abstract

The invention provides a preparation method for an alpha-MnO2 nanotube, and belongs to the technical field of air fuel cells. The addition amount of hydrochloric acid is changed to regulate the specific surface area of the alpha-MnO2 nanotube, the alpha-MnO2 nanotube with a large specific surface area is prepared, a contact area between an active locus and electrolyte is increased through the large specific surface area, in addition, a hollow structure is favorable for the diffusion migration of ions, and the ORR (Oxygen Reduction Reaction) catalytic performance of the alpha-MnO2 nanotube is improved. The data of an embodiment indicates that the specific surface area of the alpha-MnO2 nanotube is as high as 52.9030m<2> / g, and the ORR activity can be on a par with that of 20%wt Pt / C (commercial electrode).

Description

technical field [0001] The invention relates to the technical field of air fuel cells, in particular to an α-manganese dioxide nanotube, a silver nanoparticle-loaded α-manganese dioxide nanotube, a preparation method and an application. Background technique [0002] In the electrochemical reaction of aluminum-air batteries, when there is no oxygen reduction catalyst, the reduction of oxygen at the cathode is very slow, resulting in a very large overvoltage. In order to reduce the electrochemical polarization of the cathode reaction process, it is necessary to use high-efficiency Catalysts that promote oxygen reduction, so it is necessary to find cheap and efficient air electrode catalysts. [0003] For Mn-based oxygen reduction catalysts, the crystal type, surface area, and surface element valence state distribution are the main factors affecting the catalytic performance. The existing preparation of α-MnO by hydrothermal method 2 Nano hollow tubes have the problem of low ...

Claims

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Application Information

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IPC IPC(8): C01G45/02B82Y30/00B82Y40/00H01M4/90H01M12/06
CPCB82Y30/00B82Y40/00C01G45/02C01P2004/13C01P2006/12H01M4/9016H01M12/06
Inventor 卢惠民许彬彬蔡伟邓燕曹媛杨文文
Owner BEIHANG UNIV
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