Gas diffusion electrode employing nano MnO2 catalyst

A gas diffusion electrode and catalyst technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of affecting electrode performance, poor conductivity, easy agglomeration, etc., to overcome poor conductivity, good conductivity, particle size small effect

Inactive Publication Date: 2012-02-22
SHANGHAI YAOYU INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the same type of catalyst, the smaller the particle size and the better the dispersion, the higher its catalytic activity and utilization rate. Therefore, with the development of nanotechnology, people began to use nano-MnO 2 As a catalyst, it has high c

Method used

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  • Gas diffusion electrode employing nano MnO2 catalyst
  • Gas diffusion electrode employing nano MnO2 catalyst
  • Gas diffusion electrode employing nano MnO2 catalyst

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] Prepare activated carbon carbon-supported nano-MnO through the following steps 2 catalyst:

[0033] Step one, pretreat the activated carbon at high temperature and oxidize it in air at 180℃ for 5h;

[0034] Step 2: Disperse the activated carbon treated in Step 1 with a small amount of absolute ethanol, drop MnSO4 into a saturated solution drop by drop, then immerse in a vacuum for 3 hours, and then add KOH solution to alkalize to form a gel;

[0035] Step 3: Wash the jelly obtained in step 2 with distilled water, dry, and oxidize at 300°C for 5 hours to obtain activated carbon-supported nano-MnO 2 catalyst.

Example Embodiment

[0036] Example 2

[0037] This example is the same as Example 1, the difference lies in: in step one, air oxidation at 200°C for 3.5h; in step two, immersion under vacuum for 2h; step three, oxidation at 350°C for 4h.

Example Embodiment

[0038] Example 3

[0039] This embodiment is the same as the embodiment 1, the difference is: in step one, it is oxidized in air at 220°C for 2h; in step two, it is immersed under vacuum for 1h; in step three, it is oxidized at 380°C for 2h.

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Abstract

The invention discloses a gas diffusion electrode employing a nano MnO2 catalyst. The gas diffusion electrode comprises a current collector, and a water proof layer and a catalysis layer that are coated on two sides of the current collector. A catalyst employed by the catalysis layer is a carbon supported nano MnO2 catalyst, which is preferably to be a nano carbon tube supported nano MnO2 catalyst and / or an active carbon supported nano MnO2 catalyst. Compared with a prior art, the invention enables the catalyst of nano MnO2 to be fixed on active carbon and nano carbon tube with good conductivity, so as to overcome defects of the nano MnO2, such as weak conductivity and easily agglomerated and shed particles and enhance stability and catalysis performances of the carbon supported nano MnO2 catalyst. Meanwhile, addition of the carbon tube into the active carbon reduces contact resistors among the active carbon particles and between the active carbon particle and a binder, so as to enhance performances of the gas diffusion electrode of the invention.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a method using nanometer MnO 2 Catalyst gas diffusion electrode. Background technique [0002] Due to its high specific energy, high reliability, no pollution to the environment, and safe use, metal-air batteries have attracted increasing attention in recent years. However, as the positive electrode of the battery, the reaction process of the air electrode is complicated, the exchange current density is low, and oxygen reduction is difficult. The main obstacle of the whole battery reaction; therefore, improving the performance of the air electrode has been the top priority of related research. [0003] At present, the research on oxygen electrode catalysts mainly focuses on noble metal and alloy catalysts, transition metal composite oxides, and some transition metal macrocyclic compounds, and there are few studies on the structure and properties of oxygen electrod...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/90
CPCY02E60/50
Inventor 不公告发明人
Owner SHANGHAI YAOYU INDAL
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