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Heat treatment process for improving oxygen reduction catalytic activity of non-noble metal catalyst

A catalytically active, non-precious metal technology, used in electrical components, battery electrodes, circuits, etc., can solve the problems of high load and high cost

Inactive Publication Date: 2021-06-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high loading capacity of traditional Pt-based electrocatalysts in practical applications and their high cost have led researchers to focus on non-noble metal catalysts with transition metals as active sites.

Method used

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  • Heat treatment process for improving oxygen reduction catalytic activity of non-noble metal catalyst
  • Heat treatment process for improving oxygen reduction catalytic activity of non-noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Dissolve 0.3232g of ferric nitrate nonahydrate and 2.7369g of zinc nitrate hexahydrate in 400ml of methanol solution, and stir on a magnetic stirrer until the prepolymer solid is completely dissolved. Then, 4.105 g of 2-methylimidazole was added into 400 ml of methanol solution, and stirred on a magnetic stirrer until the 2-methylimidazole was completely dissolved. Next, the above two mixture solutions were poured into a three-necked flask, and heated in a water bath at 60° C. for 24 h. The supernatant of the reacted sample was poured off, the sample was centrifuged, washed, and vacuum-dried at 60° C. for 12 hours. The above-mentioned dried samples were heated up to 200° C. at a rate of 5° C. / min under an Ar atmosphere, and kept at this temperature for 1 h. Then, the temperature was raised from 200°C to 1000°C at the same rate of 5°C / min, and the calcination was maintained for 1 h. Cool naturally to obtain a Fe-N-C catalyst sample.

Embodiment 2

[0038] Dissolve 0.3232g of ferric nitrate nonahydrate and 2.7369g of zinc nitrate hexahydrate in 400ml of methanol solution, and stir on a magnetic stirrer until the prepolymer solid is completely dissolved. Then, 4.105 g of 2-methylimidazole was added into 400 ml of methanol solution, and stirred on a magnetic stirrer until the 2-methylimidazole was completely dissolved. Next, the above two mixture solutions were poured into a three-necked flask, and heated in a water bath at 60° C. for 24 h. The supernatant of the reacted sample was poured off, the sample was centrifuged, washed, and vacuum-dried at 60° C. for 12 hours. The above-mentioned dried samples were heated up to 300° C. at a rate of 5° C. / min under an Ar atmosphere, and kept at this temperature for 1 h. Then, the temperature was raised from 300°C to 1000°C at the same rate of 5°C / min, and the calcination was maintained for 1 h. Cool naturally to obtain a Fe-N-C catalyst sample.

Embodiment 3

[0040]Dissolve 0.3232g of ferric nitrate nonahydrate and 2.7369g of zinc nitrate hexahydrate in 400ml of methanol solution, and stir on a magnetic stirrer until the prepolymer solid is completely dissolved. Then, 4.105 g of 2-methylimidazole was added into 400 ml of methanol solution, and stirred on a magnetic stirrer until the 2-methylimidazole was completely dissolved. Next, the above two mixture solutions were poured into a three-necked flask, and heated in a water bath at 60° C. for 24 h. The supernatant of the reacted sample was poured off, the sample was centrifuged, washed, and vacuum-dried at 60° C. for 12 hours. The above-mentioned dried samples were heated up to 400° C. at a rate of 5° C. / min under an Ar atmosphere, and kept at this temperature for 1 h. Then, the temperature was raised from 400 °C to 1000 °C at the same rate of 5 °C / min, and the calcination was maintained for 1 h. Cool naturally to obtain a Fe-N-C catalyst sample.

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Abstract

The invention discloses a heat treatment process for improving oxygen reduction catalytic activity of a non-noble metal catalyst, which comprises the following steps: step 1, stirring and dispersing an imidazole source at normal temperature, and dissolving in a methanol solvent; 2, stirring and dispersing a metal source at normal temperature, and dissolving the metal source in a methanol solvent; 3, mixing the solutions in the step 1 and the step 2, and carrying out a hydrothermal reaction; 4, carrying out centrifugal separation and centrifugal washing on the catalyst material prepared in the step 3; 5, drying the washed catalyst; and 6, fully grinding the dried catalyst material, and carrying out heat treatment in an inert gas atmosphere. The prepared Fe-N-C catalyst material subjected to low-temperature treatment is excellent in catalytic performance, and possibly has incomparable advantages when being used as a cathode catalyst material of a proton exchange membrane fuel cell. The low-temperature heat treatment mode can be used for reference in other types of Fe-N-C materials.

Description

technical field [0001] The invention belongs to the field of fuel cells, and is an improvement of a catalyst material preparation process for non-noble metal oxygen reduction reaction in electrocatalysis, and specifically relates to a heat treatment process for improving the oxygen reduction catalytic activity of a non-noble metal catalyst. Background technique [0002] Today, the energy crisis and environmental pollution problems have become more and more serious, and it is imminent to find clean, environmentally friendly and efficient new energy sources that can replace traditional fossil energy sources. The high energy density and harmlessness of fuel cells have become the best choice for new energy in the future. Among them, the oxygen reduction reaction (ORR) kinetics of its cathode is relatively sluggish. Therefore, the use of suitable catalysts to increase the activity of the oxygen reduction reaction is of the utmost importance. However, the high loading capacity o...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/9041H01M4/9083H01M4/8882H01M4/8885Y02E60/50
Inventor 孔凡鹏赵雷王家钧孙雪宋亚杰任丽萍尹鸽平
Owner HARBIN INST OF TECH
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