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Bimetal single atom supported catalyst and preparation method thereof

A supported catalyst and bimetallic technology, applied in the field of electrocatalysis, can solve the problems of low reaction efficiency and achieve the effect of improving selectivity and optimizing electronic structure

Active Publication Date: 2020-05-05
INST OF NEW ENERGY SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently reported single-atom Pt catalysts mainly undergo two-electron transfer during the oxygen reduction process, the reaction product is hydrogen peroxide, and the reaction efficiency is low.

Method used

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  • Bimetal single atom supported catalyst and preparation method thereof
  • Bimetal single atom supported catalyst and preparation method thereof
  • Bimetal single atom supported catalyst and preparation method thereof

Examples

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preparation example Construction

[0033] refer to figure 1 , the preparation method of the double metal single atom supported catalyst of the present invention may comprise the following steps:

[0034] S1. Using metal-organic frameworks (MOFs) and cyanamide or its polymers as raw materials to prepare Me-NCs with a core-shell structure, where Me is derived from metals in metal-organic frameworks.

[0035] Among them, the optional metal organic framework materials include: cobalt organic framework material (Co-MOF), iron organic framework material (Co-MOF), nickel organic framework material (Ni-MOF) and the like. Alternative types of metal-organic frameworks include MILs (Levasil frameworks), ZIFs (zeolitic imidazolate frameworks), etc. Polymers of cyanamide include dicyandiamide and melamine.

[0036] Specifically, in this step S1, the metal-organic framework material and cyanamide (dicyandiamide or melamine) are mixed in a mass ratio of 1:(1-20), which can be placed in a tube furnace under an inert gas (suc...

Embodiment 1

[0049] Preparation of nitrogen-doped defect carbon-supported PtCo bimetallic single-atom catalyst A-CoPt-NC for basic ORR:

[0050] Dissolve 0.2 g of cobalt nitrate, 0.21 g of trimesic acid and 0.02 g of 4,4-bipyridine in 8.47 ml of dimethylformamide solution, add 1 ml of deionized water and 7.18 ml of glycerin, and stir for 2 hours ,well mixed. Then the solution was transferred to an oven, kept at 65°C for 48 hours, and then centrifuged to obtain a cobalt organic framework material (Co-MOF).

[0051] The Co-MOF and dicyandiamide were mixed at a mass ratio of 1:16, put into a tube furnace, and burned at 850 °C for two hours under a nitrogen atmosphere to obtain Co-NC with a core-shell structure. Disperse 4 mg of Co-NC in aqueous ethanol (0.2 mL of ethanol, 0.8 mL of water), add 0.08 mL of naphthol, and ultrasonically disperse for half an hour to obtain a suspension. Take 10 μL of the suspension and evenly spread it on a ring-disk electrode with a diameter of 4 mm. Place the...

Embodiment 2

[0056] Preparation of nitrogen-doped defect carbon-supported PtCo bimetallic single-atom catalyst A-CoPt-NC for acidic HER: refer to Example 1 for the specific method.

[0057] Figure 5 It is a comparison chart of HER performance of A-CoPt-NC (line 3), Co-NC (line 2) and commercial Pt / C (line 1) catalysts in Example 2. It can be seen from the figure that the performance of A-CoPt-NC has been greatly improved compared with that before activation, and surpassed the commercial Pt / C catalyst. Current density at 60mA / cm 2 , only need 0.06V overpotential, which is less than 0.08V of Pt / C.

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Abstract

The invention discloses a bimetallic mono-atomic supported catalyst and a preparation method thereof. The preparation method comprises following steps: step one, taking an organometallic skeleton material and cyanamide (or cyanamide polymer) as raw materials to prepare Me-NC with a core-shell structure, wherein Me represents a metal of the organometallic skeleton material; step two, adding Me-NC into a dispersant, then adding a binding agent, and carrying out ultrasonic dispersion to obtain suspension liquid; step three, evenly painting the suspension liquid on a ring-disc electrode, soaking the ring-disc electrode in electrolyte, and taking Pt as the counter electrode to carry out multiple times of continuous cyclic voltammetry; and step four, after cyclic voltammetry, separating materials on the ring-disc electrode by ultrasonic waves, washing, and drying to obtain nitrogen doped defected carbon supported Pt-Me bimetallic mono-atomic catalyst, namely a bimetallic mono-atomic supported catalyst. Pt molecules and Me molecules are distributed in the defect areas of carbon carriers, the distance between metal molecules is smaller, compared with the distance between molecules of a common mono-atomic Pt catalyst, a synergistic effect is generated, and the selectivity of four-electron reactions is improved.

Description

technical field [0001] The invention relates to the technical field of electrocatalysis, in particular to a bimetallic single-atom supported catalyst and a preparation method thereof. Background technique [0002] Electrocatalytic reactions, such as hydrogen production reaction (HER) and oxygen reduction reaction (ORR), are widely used in the new energy industry. HER is an important half-reaction of electrocatalytic water splitting. Compared with traditional fossil fuels, the hydrogen produced by it has the advantages of green, pollution-free and sustainable development. It is currently the most important method of hydrogen production besides steam reforming hydrogen production. The ORR reaction is an important half-reaction of fuel cells and metal-air batteries, and is used in various fuel cell systems such as hydrogen-oxygen fuel cells and methanol fuel cells, as well as various metal-air battery systems such as zinc-air batteries and aluminum-air batteries. [0003] Sinc...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9008Y02E60/50
Inventor 姚向东贾毅张龙舟
Owner INST OF NEW ENERGY SHENZHEN