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Preparation method and application of M-N-C monatomic catalyst

A catalyst and atomic technology, applied in the field of preparation of M-N-C single-atom catalysts, can solve the problems of difficult to clarify the structure-activity relationship between precursors and product catalysts, the catalyst sites are not necessarily uniform, and cannot be utilized, etc. Easy, low-cost, easy-to-remove effect

Active Publication Date: 2021-01-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since the M-N-C catalyst is usually processed at high temperature during preparation, there is a large uncertainty in its microstructure. The main problems are: 1) The high surface energy of the metal makes it easy to agglomerate during the processing, forming Particles; 2) It is not easy to clarify the structure-activity relationship between the precursor and the product catalyst, resulting in that the catalyst sites formed are not necessarily uniform, and the surface of the catalyst may not all have effective sites; 3) The formed single-atom sites are easy to bury In the carbon skeleton, not fully utilized

Method used

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  • Preparation method and application of M-N-C monatomic catalyst
  • Preparation method and application of M-N-C monatomic catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Take 2g of copper oxide and 1g of glycoluril into the ball mill jar, and mill for 2 hours. Transfer the resulting powder to a tube furnace at 5% H 2 / N 2 In the atmosphere, heat to 250°C at 5°C / min and keep it for 4 hours, then switch the atmosphere to N 2 And heated at 5°C / min to 900°C and kept for 3 hours. After the tube furnace was naturally cooled to room temperature, the product was taken out and put into 6mol L -1 Washed in hydrochloric acid for 120 hours. Afterwards, it was suction-filtered and washed with deionized water until neutral, and the filter cake was put into an oven at 60°C for 24 hours to obtain a Cu-N-C-1 single-atom catalyst. According to X-ray photoelectron spectroscopy (XPS), the content of metal elements in the catalyst is 2.3wt.%, and the content of nitrogen elements is 9.5wt.%.

Embodiment 2

[0046] Example 2: Take 2g of copper oxide and 0.8g of glycoluril into a ball mill jar, and ball mill for 2 hours. Transfer the resulting powder to a tube furnace at 5% H 2 / N 2 In the atmosphere, heat to 250°C at 5°C / min and keep it for 4 hours, then switch the atmosphere to N 2 And heated at 5°C / min to 900°C and kept for 3 hours. After the tube furnace was naturally cooled to room temperature, the product was taken out and put into 6mol L -1 Washed in hydrochloric acid for 120 hours. Afterwards, it was suction-filtered and washed with deionized water until neutral, and the filter cake was put into an oven at 60°C for 24 hours to obtain a Cu-N-C-0.8 single-atom catalyst.

Embodiment 3

[0047] Example 3: Take 2g of copper oxide and 1.25g of glycoluril into a ball mill jar, and ball mill for 2 hours. Transfer the resulting powder to a tube furnace at 5% H 2 / N 2 In the atmosphere, heat to 250°C at 5°C / min and keep it for 4 hours, then switch the atmosphere to N 2 And heated at 5°C / min to 900°C and kept for 3 hours. After the tube furnace was naturally cooled to room temperature, the product was taken out and put into 6mol L -1 Washed in hydrochloric acid for 120 hours. Afterwards, it was suction-filtered and washed with deionized water until neutral, and the filter cake was put into an oven at 60°C for 24 hours to obtain a Cu-N-C-1.25 single-atom catalyst.

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Abstract

The invention relates to the field of nano catalytic materials, particularly to a preparation method and application of an M-N-C monatomic catalyst. According to the method, metal or metal oxide and glycoluril are subjected to ball milling to obtain a uniform mixture, then the uniform mixture is subjected to a pretreatment step and a high-temperature pyrolysis carbonization step, and finally a template is removed and dried. The catalyst obtained by the preparation method has high uniformity and contains monatomic sites, and the monatomic sites tend to be distributed on the surface of an electrocatalyst so as to show excellent oxygen reduction electrocatalytic activity.

Description

technical field [0001] The invention relates to the field of nano catalytic materials, in particular to a preparation method and application of an M-N-C single-atom catalyst. Background technique [0002] With the continuous consumption of fossil energy and the increasingly prominent environmental problems, the development of efficient and clean electrochemical energy technologies such as fuel cells and metal-air batteries has gradually become an important direction for the sustainable development of human society. In these technologies, electrocatalyst plays an extremely important role, and its performance directly affects the efficiency of the corresponding device. On the other hand, the current commercial catalysts for fuel cells are platinum-based catalysts, and platinum metal reserves are limited, making it difficult to achieve large-scale commercial use. Therefore, the development of low-cost and high-efficiency non-precious metal catalysts is an important research di...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B82Y30/00B82Y40/00
CPCH01M4/8825H01M4/9083H01M4/9041H01M4/90B82Y30/00B82Y40/00Y02E60/50
Inventor 丁维平许逸达王涛郭向可彭路明郭学锋祝艳薛念华
Owner NANJING UNIV
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