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P-O doped Fe-N-C nanosheet and preparation method thereof

A nanosheet, P-O technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult to achieve excellent dual-functional catalytic performance, large overpotential, poor stability, etc., to achieve catalytic The effect of increasing the number of active sites and increasing the loading of Fe atoms

Active Publication Date: 2019-12-31
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Theoretical studies have shown (Zhenghang Zhao, et al. Design Principles for Dual-Element-Doped Carbon Nanomaterials as Efficient Bifunctional Catalysts for Oxygen Reduction and Evolution Reactions. ACS Catal. 2016, 6, 1553-1558.), based on P doping is beneficial to achieve excellent Bifunctional catalyst research, but its stability is still poor
[0005] Single-atom catalysts in the prior art still have the problems of large overpotential, poor stability, and difficulty in achieving excellent bifunctional catalytic performance. Therefore, it is necessary to prepare a P-doped modulated Fe-N-C single-atom Bifunctional catalysts are of great significance to the application of air batteries and even new energy

Method used

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  • P-O doped Fe-N-C nanosheet and preparation method thereof
  • P-O doped Fe-N-C nanosheet and preparation method thereof
  • P-O doped Fe-N-C nanosheet and preparation method thereof

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Embodiment 1

[0035] A preparation method of P-O doped Fe-N-C nanosheets, comprising the following steps:

[0036] Step 1: Add 3g of pyrrole, 0.3g of ferric nitrate and 30g of hydrogen peroxide in sequence in 50ml of deionized water, stir until the color of the solution changes from black to green, dry the solution at 80°C, and prepare powder A;

[0037]Step 2: Add 2.5g of zinc chloride and 0.5g of powder A to 50ml of deionized water in turn, stir until evenly dispersed, place in a freeze dryer, freeze dry to obtain solid B;

[0038] Step 3: Grinding the solid B to powder, carbonizing under the protection of nitrogen atmosphere, the carbonization temperature is 1000°C, the time is 2h, and then cooling down naturally to obtain the solid mixture C;

[0039] Step 4: Add the solid mixture C to deionized water to dissolve, perform suction filtration, and then place it in an oven at 60°C to dry to obtain a black powder D;

[0040] Step 5: Dissolve 0.1g of black powder D and 0.05g of sodium dihyd...

Embodiment 2

[0046] A preparation method of P-O doped Fe-N-C nanosheets, comprising the following steps:

[0047] Step 1: Add 1g of imidazole, 0.1g of ferric chloride and 10g of hydrogen peroxide in sequence in 50ml of deionized water, stir until the color of the solution changes from black to green, dry the solution at 80°C, and prepare powder A;

[0048] Step 2: Add 3g of zinc chloride and 0.5g of powder A in sequence to 50ml of deionized water, stir until evenly dispersed, place in a lyophilizer, and lyophilize to obtain solid B;

[0049] Step 3: Grinding the solid B to powder, carbonizing under the protection of a nitrogen atmosphere, the carbonization temperature is 900°C, and the time is 2 hours, and then cooling down naturally to obtain a solid mixture C;

[0050] Step 4: Add the solid mixture C to deionized water to dissolve, perform suction filtration, and then place it in an oven at 60°C to dry to obtain a black powder D;

[0051] Step 5: Dissolve 0.1g of black powder D and 0.1g...

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Abstract

The invention provides a P-O doped Fe-N-C nanosheet and a preparation method thereof, and belongs to the field of battery catalytic materials. The preparation method is characterized by, to begin with, forming Fe-N coordination; then, preparing a FeN4-containing carbon two-dimensional nanosheet through carbonization; and with a compound structure containing P-O bonds being as a precursor, carryingout high-temperature reaction to finally synthesize the P-O doped Fe-N-C nanosheet. Since the Fe-N coordination is formed firstly, the finally-prepared Fe atom load is greatly improved, and catalyticactive sites are increased; and secondary doping heat treatment in the preparation method facilitates further realization of the stable nanosheets. The P-O doped Fe-N-C nanosheet prepared by the method is used as a bifunctional catalyst, the catalytic performance and stability of which are superior to those of existing commercial Pt / C+IrO2 catalysts.

Description

technical field [0001] The invention belongs to the field of battery catalytic materials, in particular to a P-O-doped Fe-N-C nanosheet and a preparation method thereof, and the application of the nanosheet as a bifunctional catalyst. Background technique [0002] Electrochemical oxygen reduction reaction (oxygen reduction reaction ORR) and oxygen evolution reaction (oxygenevolution reaction OER) are the key reactions that restrict metal-air batteries, and their efficiency is directly related to the performance of the battery, and the catalyst is the most important thing associated with them. heavy. Traditional catalysts are mainly platinum-series noble metals because of their high ORR catalytic activity, and OER catalysts with high activity include noble metals iridium, ruthenium and their oxides. However, whether it is a platinum-based catalyst or an iridium- or ruthenium-based catalyst, its high cost, single catalytic performance and poor stability limit its large-scale ...

Claims

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Application Information

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IPC IPC(8): H01M4/90B82Y30/00B82Y40/00
CPCH01M4/9041H01M4/9083B82Y30/00B82Y40/00Y02E60/50
Inventor 熊杰孙鹤雷天宇陈伟王显福胡安俊晏超贻
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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