A high -performance Co3O4-CeO2/Co-N-C composite catalyst and preparation method and application thereof

A co3o4-ceo2, composite catalyst technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor activity of non-precious metal catalysts, complex preparation process, etc., and achieve excellent ORR and OER catalytic performance. The process is simple and easy. effect of operation

Active Publication Date: 2019-01-01
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and deficiencies of poor non-noble metal catalyst activity and complex preparation process in the prior art, and provide a high-performance Co 3 o 4 -CeO 2 / Co-N-C composite catalyst preparation method

Method used

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  • A high -performance Co3O4-CeO2/Co-N-C composite catalyst and preparation method and application thereof
  • A high -performance Co3O4-CeO2/Co-N-C composite catalyst and preparation method and application thereof
  • A high -performance Co3O4-CeO2/Co-N-C composite catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] This embodiment provides a high performance Co 3 o 4 -CeO 2 / Co-N-KB composite catalyst, prepared by the following method.

[0049] To prepare N-KB (nitrogen-doped carbon carrier), weigh 7 grams of KB carbon (Ketjenblack carbon) and 7 grams of melamine and drop them into a 250ml beaker, add 200ml of ethanol, heat and stir at 60°C for 8 hours, evaporate the ethanol and dry Dry. After drying, grind it for later use, and name it N-KB.

[0050] Then weigh 0.25g of cobalt acetate and 0.15g of cerium nitrate, add them into a 100ml beaker, dissolve in 70ml of deionized water, adjust the pH to 8.0 with sodium bicarbonate, then add 1g of N-KB, and heat and stir at 80°C 30 minutes. Then add it into a 100ml polytetrafluoroethylene liner, and conduct a hydrothermal reaction at a constant temperature of 150°C for 12 hours. After the reaction, it was filtered and washed several times. After drying and grinding, the sample was calcined in a muffle furnace at 300 °C for 2 h, and...

Embodiment 2

[0061] This embodiment provides a high performance Co 3 o 4 -CeO 2 / Co-N-KB composite catalyst, prepared by the following method.

[0062] To prepare N-KB, weigh 5 grams of KB carbon and 5 grams of melamine and drop them into a 250ml beaker, add 150ml of ethanol, heat and stir at 80°C for 8 hours, evaporate the ethanol and dry it. After drying, grind it for later use, and name it N-KB.

[0063] Then weigh 0.25g of cobalt sulfate and 0.20g of cerium sulfate, add them to a 100ml beaker, and dissolve 70ml of deionized water, adjust the pH to 8.0 with ammonia water, then add 1g of N-KB, heat and stir at 80°C for 30 minutes . Then add it into a 100ml polytetrafluoroethylene liner, and conduct a hydrothermal reaction at a constant temperature of 140°C for 16 hours. After the reaction, it was filtered and washed several times. After drying and grinding, the sample was calcined in a muffle furnace at 200 °C for 4 h, and then ground to obtain Co 3 o 4 -CeO 2 / Co-N-KB composite ...

Embodiment 3

[0066] This embodiment provides a high performance Co 3 o 4 -CeO 2 / Co-N-KB composite catalyst, prepared by the following method.

[0067] To prepare N-KB, weigh 3 grams of KB carbon and 5 grams of melamine and drop them into a 250ml beaker, add 100ml of ethanol, heat and stir at 90°C for 9 hours, then evaporate the ethanol and dry it. After drying, grind it for later use, and name it N-KB.

[0068] Then weigh 0.25g of cobalt chloride and 0.15g of cerium chloride, add them to a 100ml beaker, and dissolve them in 70ml of deionized water, adjust the pH to 9.0 with sodium hydroxide, then add 1g of N-KB, at 80°C Heat and stir for 30 minutes. Then add it into a 100ml polytetrafluoroethylene liner, and conduct a hydrothermal reaction at a constant temperature of 160°C for 14 hours. After the reaction, it was filtered and washed several times. After drying and grinding, the sample was calcined in a muffle furnace at 300 °C for 3 h, and then ground to obtain Co 3 o 4 -CeO 2 / ...

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Abstract

The invention relates to a high-performance Co3O4-CeO2/Co-N-C composite catalyst and a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolvingcobalt salt and cerium salt, adjusting pH to 7-11, adding a nitrogen-doped carbon carrier, and hydrothermally reacting for 10-20h at 60-100 DEG C; the nitrogen-doped carbon carrier is obtained by reacting a carbon source and a nitrogen source with a mass ratio of 1: 1 to 5; S2: the solution after the reaction of S1 is sucked, filtered, washed, dried and ground to obtain the Co3O4-CeO2/Co-N-C composite catalyst. The preparation method provided by the invention utilizes a hydrothermal method, wherein the nitrogen-doped carbon carrier, the cobalt source and the cerium source are hydroheated in one pot, the process is simple, the operation is easy, the time is short, and the method is suitable for batch industrial production; and the prepared composite catalyst has excellent catalytic properties for both ORR and OER, and can be used in fuel cells, and metal-air batteries.

Description

technical field [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and specifically relates to a high-performance Co 3 o 4 -CeO 2 / Co-N-C composite catalyst and its preparation method and application. Background technique [0002] With the increasing demand for green and renewable energy for the sustainable development of human beings, countries have devoted a lot of energy to the field of new energy research. Scientists are committed to developing efficient, low-cost and environmentally friendly energy conversion and storage systems, such as metal - Air cells, fuel cells and more. Electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are very important reaction processes in energy conversion technologies, but they both exhibit slow kinetics due to their complex multi-step electron transfer pathways, resulting in more energy loss. As we all know, the catalysts used in the ORR reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90
CPCH01M4/90H01M4/9025H01M4/9083Y02E60/50
Inventor 施志聪沐杨昌陈远业王乃光刘钦豪
Owner GUANGDONG UNIV OF TECH
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