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a mn 5 o 8 Nano cage oxygen reduction electrocatalyst and preparation method thereof

An electrocatalyst and nano-cage technology, which is applied in the field of Mn5O8 nano-cage oxygen reduction electrocatalyst and its preparation, can solve the problems of high consumption of noble metal Pt, high commercial cost, non-precious metal catalyst catalytic activity can not meet the requirements and the like

Active Publication Date: 2022-08-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a low-cost non-precious metal Mn in order to overcome the high consumption of noble metals such as Pt in existing ORR catalysts, the high commercial cost, and the catalytic activity of non-noble metal catalysts that cannot meet the requirements. 5 o 8 Nano-cage ORR electrocatalyst and preparation method thereof

Method used

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  • a mn <sub>5</sub> o <sub>8</sub> Nano cage oxygen reduction electrocatalyst and preparation method thereof
  • a mn <sub>5</sub> o <sub>8</sub> Nano cage oxygen reduction electrocatalyst and preparation method thereof
  • a mn <sub>5</sub> o <sub>8</sub> Nano cage oxygen reduction electrocatalyst and preparation method thereof

Examples

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preparation example Construction

[0031] Mn 3 O 4 Preparation: Dissolve 0.5-2 mmol of manganese acetylacetonate in 20-80 mL of alcohol solution, then transfer the solution to a hydrothermal kettle, react at 100-120 ° C for 10-14 h, and then centrifuge the resulting mixture with alcohol for three times. Repeated, centrifuged with water once, and finally collected by freeze-drying for 10-24 h. The hydrothermal reaction can also be carried out under high pressure, and the pressure can be 2-20MPa.

[0032] Preparation of MnO: The above-obtained samples were reacted at 400-700° C. for 1-4 hours in a reducing atmosphere. The reducing atmosphere is 5%H 2 Mixed gas with 95% Ar or 10% H 2 and 90% Ar mixture. above H 2 or Ar percentage refers to the volume ratio. The rate of temperature increase may be 2 to 5°C / min.

[0033] Mn 5 O 8 Preparation: Take 5 mg of the above MnO nanoflower powder and 5 mg of carbon black into a 5 mL centrifuge tube, add 90-200 μL of deionized water and 770-900 μL of isopropanol at t...

Embodiment 1

[0038] According to the above-mentioned technical scheme and technological process of the present invention, first prepare Mn 3 O 4 Nanoflower precursor materials. Weigh 1 mmol of manganese acetylacetonate and dissolve it in 40 mL of alcoholic solution, then transfer the solution to a hydrothermal kettle, react at 120 ° C for 10 h, then centrifuge the resulting mixture three times with alcohol and once with water, and finally freeze the solution. Dry for 12h and collect to obtain Mn 3 O 4 Nanoflower precursor materials.

[0039] The Mn obtained above was 3 O 4 Nanoflower precursor material at 5%H 2 The mixture was reacted with 95% Ar at 400 °C for 2 h, and the heating rate was 5 °C / min to obtain MnO nanoflower powder.

[0040] Next is Mn 5 O 8 Preparation of catalyst: 5 mg of the above MnO nanoflower powder and 5 mg of carbon black were placed in a 5 mL centrifuge tube, 190 μL of deionized water and 800 μL of isopropanol were added at the same time, sonicated for 0.5 ...

Embodiment 2

[0043] According to the process flow (same as Example 1), first prepare Mn 3 O 4 Nanoflower precursor materials. Then the Mn obtained above 3 O 4 Nanoflower precursor material at 5%H 2 React with 95% Ar at 500 °C for 2 h at a heating rate of 5 °C / min to obtain MnO nanoflower powder.

[0044] Next is Mn 5 O 8 Preparation of catalyst: 5 mg of the above MnO nanoflower powder and 5 mg of carbon black were placed in a 5 mL centrifuge tube, 120 μL of deionized water and 860 μL of isopropanol were added at the same time, sonicated for 0.5 hours, then 10 μL of Nafion solution was added, and sonicated again for 0.5 hours to obtain Suspension at a concentration of 5 mg / mL;

[0045] Take the above suspension and apply it to the surface of the glassy carbon electrode, use the glassy carbon electrode as the working electrode, the graphite rod as the counter electrode, and the Ag / AgCl as the reference electrode, correctly connect in the electrolytic cell and use the chronoamperometry...

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Abstract

The invention discloses a kind of Mn 5 O 8 Nano cage oxygen reduction electrocatalyst and preparation method thereof. The MnO nanoflower-like material with coexistence of cubic crystal system and orthorhombic crystal system and containing oxygen vacancies is generated in situ by electrochemical reduction reaction. 5 O 8 Nano-caged oxygen reduction electrocatalyst, wherein the Mn 5 O 8 The nano-cage oxygen reduction electrocatalyst is monoclinic and presents a nano-cage structure formed by stacking nanosheets.

Description

technical field [0001] The invention relates to a non-precious metal oxygen reduction reaction (ORR) electrode catalyst and a preparation method thereof, in particular to a Mn 5 O 8 Nano cage oxygen reduction electrocatalyst and preparation method thereof. Background technique [0002] As we all know, fossil fuels are the most important energy situation in the current human society. However, it takes millions of years for fossil fuels to form naturally. In the near future, traditional fuels will inevitably be difficult to meet the world's demand for energy, and their excessive use will lead to It has caused a series of damage to the environment, such as air pollution and global warming. Therefore, in order to realize the sustainable development of human society, it has become an urgent task in the 21st century to get rid of the shackles of fossil fuels and develop and utilize renewable and clean energy. [0003] In this context, fuel cell technology represented by hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90C01G45/02B01J23/34B01J35/02B82Y30/00B82Y40/00B01J35/00
CPCH01M4/9016C01G45/02B01J23/34B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/04C01P2002/85C01P2004/61B01J35/00B01J35/30B01J35/33Y02E60/50
Inventor 田汉崔香枝施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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