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ZIFs-derived non-noble metal oxygen reduction catalyst and preparation method thereof and application thereof

A non-precious metal and catalyst technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low utilization rate of active sites, low density of active centers, poor activity and durability, etc., and achieve good methanol resistance performance, material Low cost, effect of improving oxygen reduction activity

Inactive Publication Date: 2019-05-07
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, for non-precious metal catalysts, there are still problems such as low active center density, low active site utilization, poor activity and durability in acidic media, etc.

Method used

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  • ZIFs-derived non-noble metal oxygen reduction catalyst and preparation method thereof and application thereof
  • ZIFs-derived non-noble metal oxygen reduction catalyst and preparation method thereof and application thereof
  • ZIFs-derived non-noble metal oxygen reduction catalyst and preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] (1) Dissolve 3.2g of 2-methylimidazole in 50mL of methanol, and another 1.86g of Zn(NO 3 ) 2 ·6H 2 O and 0.043g FeSO 4 ·7H 2 O (the ratio of the amount of iron to zinc is 1:40, the ratio of the amount of zinc to 2-methylimidazole is 1:6.23) is dissolved in 15mL of methanol, and the above solution is added, and the mixed solution is placed under ultrasonic conditions. The Fe-doped ZIFs precursor was obtained by reacting for 2 h, and the precursor was dried at 60 °C for 3 h.

[0071] (2) The dried precursor was heat-treated in a vacuum tube furnace at 950 °C for 2 h under the protection of a nitrogen atmosphere, with a heating rate of 5 °C / min, and then naturally dropped to room temperature.

[0072] (3) After the sample is lowered to room temperature, it is immersed in 0.5M H 2 SO 4 The solution was acid-washed at 80°C for 8h, then filtered, fully washed with deionized water, and then dried at 60°C for 3h.

[0073] (4) The dried sample was heated to 850°C at a rat...

Embodiment 2

[0086] Prepare ZIFs derivative non-noble metal oxygen reduction catalyst substantially according to the same method as Example 1, the difference is: in step (1) FeSO 4 ·7H 2 The feeding amount of O is changed into 0.058g (the ratio of the amount of substance of iron and zinc nitrate is 1:30) by 0.043g, the catalyst obtained is in 0.1M HClO 4 The half-wave potential obtained by testing the oxygen reduction polarization curve in the solution is 0.791V.

Embodiment 3

[0088] Prepare ZIFs derivative non-noble metal oxygen reduction catalyst substantially according to the same method as Example 1, the difference is: in step (1) FeSO 4 ·7H 2 The charging capacity of O is changed into 0.035g (the ratio of the amount of substance of iron and zinc nitrate is 1:50) by 0.043g, the catalyst obtained is in 0.1M HClO 4 The half-wave potential obtained by testing the oxygen reduction polarization curve in the solution is 0.782V.

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Abstract

The invention provides a ZIFs-derived non-noble metal oxygen reduction catalyst and a preparation method thereof and application thereof. The preparation method comprises the following steps of: 1) dissolving iron salt, zinc salt and 2-methylimidazole in a solvent for reaction to obtain a Fe-doped ZIFs precursor and perform drying; 2) performing primary thermal treatment of the dried Fe-doped ZIFsprecursor in the protection of a protection gas; 3) performing pickling, filtering, washing and drying of the primary thermal treatment product; 4) performing secondary thermal treatment of the driedproduct to obtain a ZIFs-derived non-noble metal oxygen reduction catalyst. The ZIFs-derived non-noble metal oxygen reduction catalyst has a porous structure and rich micropores and mesopores, is high in doping amount of hetero atoms, contains two active sites of Fe2N and FeNx, and facilitates improvement of the oxygen reduction activity.

Description

technical field [0001] The invention belongs to the technical field of new material preparation, electrochemical catalysis and energy storage, and in particular relates to a zeolitic imidazolate framework material (Zeolitic Imidazolate Frameworks, ZIFs) derived non-noble metal oxygen reduction catalyst and its preparation method and application. Background technique [0002] In the new energy system, fuel cells and metal-air batteries can provide clean, efficient, and reliable electric energy, and can be widely used in automotive power supplies and other occasions. Basic research and application development of batteries. However, high-cost catalysts are still one of the bottlenecks limiting their large-scale applications. [0003] For fuel cells, the cathode oxygen reduction reaction catalyst is still a noble metal catalyst based on Pt, and the high price of Pt makes the cost of the catalyst account for about half of the entire battery cost, which seriously restricts the la...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCY02E60/50
Inventor 杨辉刘啸邹志青陈驰邹亮亮李媛张勍
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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