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Method for solid-phase macrosynthesis of non-noble metal oxygen reduction catalyst, and catalyst and application thereof

A non-precious metal and catalyst technology, which is applied in the field of solid-phase macro-synthesis of non-precious metal oxygen reduction catalysts, can solve the problems of difficult control of preparation process conditions, complicated preparation methods, unfavorable industrial production of catalysts, etc. Simple, convenient and easy-to-use effects

Active Publication Date: 2019-11-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the preparation methods of carbon materials based on iron / cobalt and nitrogen modification are relatively complicated, and the preparation process conditions are not easy to control, and only a small amount of catalyst can be obtained in a single preparation, which is extremely unfavorable for large-scale industrial production of catalysts.

Method used

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  • Method for solid-phase macrosynthesis of non-noble metal oxygen reduction catalyst, and catalyst and application thereof
  • Method for solid-phase macrosynthesis of non-noble metal oxygen reduction catalyst, and catalyst and application thereof
  • Method for solid-phase macrosynthesis of non-noble metal oxygen reduction catalyst, and catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Mix 0.600g nitrilotriacetic acid with 0.77g cobalt chloride (the molar ratio of nitrilotriacetic acid to cobalt chloride is 1:2), and solid-phase grind fully, place in the quartz tube of tube furnace, use Remove the air with nitrogen for half an hour, then raise the temperature to 800°C at 3°C / min, and heat-treat for 2 hours under the protection of nitrogen to obtain the heat-treated product; collect the heat-treated product, wash with water, centrifuge and vacuum-dry at 60°C, A non-noble metal oxygen reduction catalyst is obtained.

[0035] The X-ray powder diffraction curve of the non-noble metal oxygen reduction catalyst prepared in this embodiment is as follows figure 1 Shown, as can be seen from the figure, the catalyst prepared in the present embodiment contains metallic cobalt and graphitized carbon.

[0036] The laser Raman spectrum curve of the non-noble metal oxygen reduction catalyst prepared in this embodiment is as follows figure 2 As shown, it can be see...

Embodiment 2

[0049] Other preparation processes are all the same as in Example 1, only the chelating agent is changed into ethylenediaminetetraacetic acid, and the consumption is 0.92g (the molar ratio of ethylenediaminetetraacetic acid to cobalt chloride is 1:2).

[0050] The resulting non-precious metal oxygen reduction catalyst has a half-wave potential of about 0.80 volts (relative to the standard hydrogen electrode) obtained by testing the oxygen reduction curve in a 0.1 mole per liter potassium hydroxide solution, which is only higher than the half-wave potential of the commercial platinum-carbon catalyst. The potential is 0.85 volts lower than 50 millivolts, and the number of electron transfers corresponding to 0.3V-0.6V obtained from the K-L equation is also close to 4, so it shows good oxygen reduction catalytic performance. In the stability test of 20000s, the current drops to 80% of the original, and it also has methanol resistance. But there is no coral-like catalyst morphology...

Embodiment 3

[0052] Other preparation processes are all the same as in Example 1, only the chelating agent is changed into ethylenediaminetetraacetic acid, and the consumption is 1.07g (the mol ratio of ethylenediaminetetraacetic acid and cobalt chloride is 1:2).

[0053] The resulting non-precious metal oxygen reduction catalyst has a half-wave potential of 0.81 volts (relative to the standard hydrogen electrode) obtained by testing the oxygen reduction curve in a 0.1 mole per liter potassium hydroxide solution, which is only higher than the half-wave potential of the commercial platinum carbon catalyst. 0.85 volts is 40 millivolts lower, and the number of electron transfers corresponding to 0.3V-0.6V obtained from the K-L equation is also close to 4, so it shows good oxygen reduction catalytic performance. In the stability test of 20000s, the current drops to 82% of the original value, and it also has the ability to resist methanol. But it does not possess the coral-like catalyst morphol...

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Abstract

The invention discloses a method for solid-phase macrosynthesis of non-noble metal oxygen reduction catalyst, and a catalyst and application thereof. The preparation method comprises the following steps of: (1) uniformly mixing a chelating agent with an inorganic metal salt, and performing solid-phase grinding to obtain a precursor; and (2) performing heat treatment on the precursor obtained in the step (1) in an inert atmosphere, and washing, separating and drying the product to obtain the non-noble metal oxygen reduction catalyst. The method for solid-phase macrosynthesis of a non-noble metal oxygen reduction catalyst disclosed by the invention is simple in process and suitable for large-scale industrial production, and the obtained non-noble metal oxygen reduction catalyst is excellentin performance and has the potential to be used as a substitute of a noble metal oxygen reduction catalyst of a fuel cell or a metal-air cell.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a method for solid-phase macro-synthesis of a non-noble metal oxygen reduction catalyst, a catalyst and an application thereof. Background technique: [0002] At present, the energy crisis and environmental pollution are getting more and more attention from all over the world, and the development of safe, clean, efficient and sustainable new energy is the best way to solve the energy problem and environmental crisis. A fuel cell is a device that directly converts chemical energy into electrical energy. It has outstanding features such as high energy conversion efficiency, environmental friendliness, low operating temperature, high specific power and specific energy, and is considered to be the most promising chemical power source for electric vehicles and other civilian applications in the future. At the same time, due to its unique advantages such as high energy, low cost, good safety pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/90Y02E60/50
Inventor 胡劲松罗浩
Owner INST OF CHEM CHINESE ACAD OF SCI
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