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A kind of p-o doped fe-n-c nanosheet and preparation method thereof
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A P-O, nanosheet technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of large overpotential, poor stability, and difficulty in achieving excellent bifunctional catalytic performance, and achieve Fe Effects of enhanced atomic loading, increased catalytically active sites, and excellent bifunctional catalytic performance
Active Publication Date: 2022-07-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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
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Embodiment 1
[0035] A preparation method of P-O doped Fe-N-C nanosheet, comprising the following steps:
[0036] Step 1: Add 3g of pyrrole, 0.3g of ferric nitrate and 30g of hydrogen peroxide in sequence to 50ml of deionized water, stir until the color of the solution changes from black to green, dry the solution at 80°C, and then prepare powder A;
[0037]Step 2: Add 2.5g of zinc chloride and 0.5g of powder A to 50ml of deionized water in sequence, stir until dispersed evenly, place in a freeze dryer, and freeze-dry to obtain solid B;
[0038] Step 3: Grind the solid B to powder, carbonize under the protection of nitrogen atmosphere, the carbonization temperature is 1000 ° C, the time is 2 h, and then naturally cool down and cool to obtain the solid mixture C;
[0039] Step 4: Add the solid mixture C into deionized water to dissolve and then perform suction filtration, and then place it in an oven at 60°C for drying to obtain black powder D;
[0040] Step 5: Dissolve 0.1 g of black powde...
Embodiment 2
[0046] A preparation method of P-O doped Fe-N-C nanosheet, comprising the following steps:
[0047] Step 1: Add 1 g of imidazole, 0.1 g of ferric chloride and 10 g of hydrogen peroxide in sequence to 50 ml of deionized water, stir until the color of the solution changes from black to green, dry the solution at 80°C, and then 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 dispersed evenly, place in a freeze dryer, and freeze-dry to obtain solid B;
[0049] Step 3: Grind the solid B to powder, carbonize under the protection of nitrogen atmosphere, the carbonization temperature is 900 ° C, the time is 2 h, and then naturally cool and cool to obtain the solid mixture C;
[0050] Step 4: Add the solid mixture C into deionized water to dissolve and then perform suction filtration, and then place it in an oven at 60°C for drying to obtain black powder D;
[0051] Step 5: Dissolve 0.1 g of black powde...
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Abstract
The invention provides a P-O-doped Fe-N-C nanosheet and a preparation method thereof, belonging to the field of battery catalytic materials. In the preparation of the present invention, the coordination of Fe-N is formed first, and then carbonization is performed to prepare FeN-containing 4 The carbon two-dimensional nanosheets were prepared by using the compound structure containing P-O bonds as the precursor, and the high-temperature reaction was performed to finally synthesize P-O-doped Fe-N-C nanosheets. Since the coordination of Fe-N is formed first, the Fe atomic loading in the final preparation is greatly increased, and the catalytic active sites are increased; and the secondary doping heat treatment in the preparation method is beneficial to further realize stable nanosheets. The P-O-doped Fe-N-C nanosheets prepared by the invention are used as bifunctional catalysts, and their catalytic performance and stability are better than the current commercial Pt / C+IrO 2 catalyst.
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 (ORR) and oxygen evolution reaction (OER) are the key reactions restricting metal-air batteries, their efficiency is directly related to the performance of the battery, and the catalyst is the most important associated with them. heavy. Traditional catalysts are mainly platinum-series noble metals, because they have high ORR catalytic activity. OER catalysts with high activity include noble metals iridium, ruthenium and their oxides. However, both platinum-based catalysts, iridium and ruthenium-based catalysts have limited their large-scale practical applications in energy storage devices due to their high cost, single catalytic activity, and poor stability. Therefore, re...
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