Ag4Bi2O5-doped MnO2 catalyst and preparation method for oxygen electrode

A technology of catalyst and oxygen electrode, which is applied in the field of preparation of oxygen reduction catalyst and oxygen electrode, can solve problems such as rapid decline and deterioration of catalyst chemical performance, and achieve the effects of improving discharge life, increasing catalytic active points, and improving catalytic performance

Inactive Publication Date: 2013-04-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another aspect that restricts the application of manganese dioxide catalyst is its service life. Generally, the service life of manganese dioxide catalyst is tens of hours, and it declines rapidly with the increase of discharge current. For example, the adoption of G.Q. Zhang et al. MCMB modified MnO 2 Catalyst at 10 mA cm -2 A discharge voltage of 1.07 V and a service life of 23.6 hours were obtained at a small current, when the current reached 50 mA cm -2 , the battery can only give 0.73 V discharge voltage and 1.7 h service time, it can be seen that the MCMB modified MnO 2 The electrochemical performance of the catalyst deteriorates rapidly under high current conditions

Method used

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  • Ag4Bi2O5-doped MnO2 catalyst and preparation method for oxygen electrode
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  • Ag4Bi2O5-doped MnO2 catalyst and preparation method for oxygen electrode

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Effect test

Embodiment 1

[0038] (1) MnO doped with 15% silver bismuthate by weight 2 0.9 g (wherein 0.125 g of silver bismuthate), 0.6 g of activated carbon, and 0.3 g of expanded graphite were stirred in a stirrer at a speed of 200 rpm for 20 minutes, then 4 ml of ethanol was added for dispersion, and finally 0.34 g of mass fraction was added dropwise Be 60% PTFE emulsion (the quality equivalent to pure PTFE is 0.2 g), continue to keep the original speed and stir evenly to obtain the slurry for subsequent use.

[0039] Weigh 1 g of the above slurry and apply it evenly on 5 pieces with an area of ​​3×7 cm 2 One end of nickel foam with a thickness of 1 mm, so that the coating effective area of ​​the catalyst is 3 × 3 cm 2 , the nickel foam increased by about 0.2 g, and the nickel foam coated with the catalytic layer was dried in a drying oven at 60 °C for 3 h to obtain the catalyst layer.

[0040] (2) Weigh 0.2 g of camphor, 0.1 g of acetylene black and 1 ml of ethanol into a stirrer, stir at ...

Embodiment 2

[0043] Pure MnO 2 0.9 g or MnO doped with 10% by weight silver bismuthate 2 0.9g (wherein 0.09g of silver bismuthate), 0.6g of activated carbon and 0.3g of expanded graphite were stirred for 30 minutes at a speed of 150 rpm in a stirrer, then 4ml of ethanol was added for dispersion, and finally 0.34g of mass fraction was added dropwise 60% PTFE emulsion (mass equivalent to pure PTFE is 0.2 g), continue to maintain the original speed for stirring to obtain a slurry, take 1.5 g of the slurry and apply it evenly on 10 pieces with an area of ​​3 × 7 cm 2 One end of nickel foam with a thickness of 1 mm makes the coating effective area of ​​the catalyst 3×3 cm 2 , the weight of each piece of nickel foam increased by 0.15 g, and the nickel foam coated with the catalytic layer was dried in a 40 °C drying oven for 4 h to obtain a catalyst layer. The formula of the hydrophobic layer was the same as that of Example 1 to obtain an oxygen electrode.

[0044] image 3 shows pure MnO2 a...

Embodiment 3

[0046] 0.6 g MnO doped with 10% silver bismuthate 2 (or pure MnO 2 ), 0.6 g of activated carbon and 0.6 g of expanded graphite were stirred in a stirrer at a speed of 200 rpm for 20 minutes, then 4 ml of ethanol was added for dispersion, and finally 0.34 g of PTFE emulsion with a mass fraction of 60% (equivalent to pure The quality of PTFE is 0.2 g), continue to keep the original speed and stir evenly, obtain the slurry for subsequent use. Apply the above slurry evenly on 10 pieces with an area of ​​3×7 cm 2 One end of nickel foam with a thickness of 1 mm, so that the coating effective area of ​​the catalyst is 3 × 3 cm 2 , so that the nickel foam increased to about 0.2 g, and the nickel foam coated with the catalytic layer was dried in a drying oven at 80 °C for 2 h to obtain a catalyst layer. The formula of the hydrophobic layer was the same as that of Example 1 to obtain an oxygen electrode.

[0047] Attached by the cathodic polarization curve Figure 4 It can be seen t...

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Abstract

The invention relates to an Ag4Bi2O5-doped MnO2 oxygen electrode catalyst and a preparation method for an oxygen electrode. The oxygen electrode adopts a laminated structure of a waterproof layer, a catalyst layer and a conductive framework, wherein the catalyst layer consists of Ag4Bi2O5-doped MnO2, expanded graphite, treated activated carbon and Polytetrafluoroethylene (PTFE); the waterproof permeable layer consists of camphor, acetylene black, PTFE and polyvinylidene fluoride (PVDF); and the structure has a good oxygen reduction three-phase boundary. The key catalyst of the invention is a high-efficiency catalyst which takes the Ag4Bi2O5-doped MnO2 as an oxygen reduction process, can discharge at a high current density of 120 mAcm<2> and has a discharging life as high as 225 h, so as to show excellent catalytic activity.

Description

technical field [0001] The present invention relates to an Ag 4 Bi 2 o 5 doped MnO 2 The invention discloses an oxygen reduction catalyst and a preparation method of an oxygen electrode, which are applied in the fields of metal-oxygen batteries and fuel cells. Background technique [0002] With the depletion of oil resources, rising crude oil prices, and increasingly serious environmental pollution, the development of fuel cells and metal-air batteries has been widely valued internationally. Oxygen electrode is a typical gas diffusion electrode, which is widely used in fuel cells and metal-air batteries. [0003] Looking for cheap and efficient catalysts has always been the main direction of oxygen electrode research. The existing oxygen electrode catalysts mainly include platinum and platinum alloys, silver, metal chelates, metal oxides (such as manganese oxides, perovskite oxides, etc.) objects) and several other series. Although noble metal catalysts such as platinu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88H01M12/06B01J23/68
Inventor 潘军青杨萌孙艳芝
Owner BEIJING UNIV OF CHEM TECH
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