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Oxygen reduction electrocatalyst as well as preparation method and application thereof

An electrocatalyst and carbonization treatment technology, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problem of low catalytic efficiency and material transmission efficiency, and achieve the effect of increasing the active site density

Pending Publication Date: 2021-12-03
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an oxygen reduction electrocatalyst and its preparation method and application, aiming at solving the problems of low catalytic efficiency and material transfer efficiency of the existing oxygen reduction electrocatalyst

Method used

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  • Oxygen reduction electrocatalyst as well as preparation method and application thereof
  • Oxygen reduction electrocatalyst as well as preparation method and application thereof
  • Oxygen reduction electrocatalyst as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] 1), ZIF-8 and thiocyanic acid are mixed in an organic solvent according to a mass ratio of 100:1, so that thiocyanic acid is bound to the ZIF-8 through a chemical bond to obtain ZIF-8@ TCA composite material;

[0059] 2) Mix the ZIF-8@nTCA composite material with NaCl at a mass ratio of 4:1 to obtain a mixed material, and carbonize the mixed material in a nitrogen atmosphere at a carbonization temperature of 750°C, and The temperature was kept at this temperature for 2 hours to prepare the oxygen reduction electrocatalyst (1.0 NSC-NaCl-750).

Embodiment 2

[0061] 1), ZIF-8 and thiocyanic acid are mixed in an organic solvent according to the mass ratio of 100:3.5, so that thiocyanic acid is bound to the ZIF-8 through a chemical bond to obtain ZIF-8@ TCA composite material;

[0062] 2) Mix the ZIF-8@nTCA composite material with NaCl at a mass ratio of 20:7 to obtain a mixed material, and carbonize the mixed material in a nitrogen atmosphere at a carbonization temperature of 900°C, and The temperature was kept at this temperature for 2 hours to prepare the oxygen reduction electrocatalyst (3.5NSC-NaCl-900).

Embodiment 3

[0064] 1), ZIF-8 and thiocyanic acid are mixed in an organic solvent according to the mass ratio of 100:6, so that thiocyanic acid is bound to the ZIF-8 through a chemical bond to obtain ZIF-8@ TCA composite material;

[0065] 2) Mix the ZIF-8@nTCA composite material with NaCl at a mass ratio of 20:7 to obtain a mixed material, and carbonize the mixed material in a nitrogen atmosphere at a carbonization temperature of 800°C, and The temperature was kept at this temperature for 2 hours to prepare the oxygen reduction electrocatalyst (6.0NSC-NaCl-800).

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Abstract

The invention discloses an oxygen reduction electrocatalyst and a preparation method and application thereof. The preparation method comprises the steps that ZIF-8 and trithiocyanuric acid are mixed in an organic solvent, the trithiocyanuric acid is combined to the ZIF-8 through chemical bonds, and a ZIF-8 coated TCA composite material is obtained; the ZIF-8 coated nTCA composite material is mixed with NaCl, and a mixed material is obtained; and carbonization treatment is conducted on the mixed material in an inert atmosphere to prepare the oxygen reduction electrocatalyst. The prepared oxygen reduction catalyst has the oxygen reduction catalytic performance close to that of commercial Pt / C under the alkaline condition, and the catalytic stability is better than that of the commercial Pt / C. In the test of an aluminum-air material battery assembled by the oxygen reduction catalyst disclosed by the invention, the battery performance reaches the power density of 250.86 mW*cm<-2>, and the open-circuit voltage reaches 1.71 V. By mixing NaCl to regulate and control the pore structure of the carbon material, catalytic active sites can be effectively exposed, the active site density of the catalyst is improved, and a thought is provided for preparing other types of catalysts through the method.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to an oxygen reduction electrocatalyst and its preparation method and application. Background technique [0002] As an important part of new energy conversion devices such as fuel cells and metal-air batteries, the oxygen reduction reaction has severely limited its development due to its slow kinetics. Platinum-based noble metal catalysts are considered to be the best oxygen reduction catalysts at present, but large-scale applications cannot be realized due to their high cost. The continuous development of non-noble metal carbon-based materials has attracted extensive attention in the field of oxygen reduction, but there are very few non-metal-based catalysts that can be applied to metal-air batteries. Many catalysts with good activity in electrochemical tests have only average performance and poor stability in actual metal-air battery tests. [0003] In recent years, the adjus...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/88H01M4/90Y02E60/50
Inventor 符显珠崔林芳骆静利
Owner SHENZHEN UNIV