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MOF-based platinum monatomic catalyst, and preparation and application thereof

A catalyst and atom technology, which is applied in the field of electrochemical energy, achieves the effects of simple preparation method, reduced cost, and favorable promotion and use

Pending Publication Date: 2021-06-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of stable single-atom catalysts during catalytic reactions remains a major challenge

Method used

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  • MOF-based platinum monatomic catalyst, and preparation and application thereof
  • MOF-based platinum monatomic catalyst, and preparation and application thereof
  • MOF-based platinum monatomic catalyst, and preparation and application thereof

Examples

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preparation example Construction

[0031] A kind of preparation method of MOF-based platinum single-atom catalyst provided by the invention comprises the following steps:

[0032] Step S1, adding zirconium chloride, 2-aminoterephthalic acid and platinum source to the mixed solution of DMF and adjusting acid, heating for reaction, washing after cooling, and then drying the washed material to obtain a dry material ;

[0033] Step S2, performing high-temperature carbonization on the dry material at 800°C to 1000°C in an inert gas atmosphere to obtain a carbonized substance;

[0034] Step S3, soaking the carbonized substance with etching acid, and washing to obtain a MOF-based platinum single-atom catalyst.

[0035] In the above step S1, the molar ratio of zirconium chloride, 2-aminoterephthalic acid and platinum source is 0.9:0.9:0.5-3. The platinum source is any one of chloroplatinic acid, platinum acetylacetonate or platinum dichloride. In the present invention, only chloroplatinic acid and platinum acetylace...

Embodiment 1

[0044] In this example, the platinum source is chloroplatinic acid, and the obtained MOF-based platinum single-atom material is Pt(IV)-SACs material.

[0045] Dissolve 210 mg of zirconium chloride, 163 mg of 2-aminoterephthalic acid, and 0.5 mL (solvent: DMF; concentration: 1 mg / mL) of chloroplatinic acid in 40 mL of dimethylformamide and 4.8 mL of glacial acetic acid, and fill in vials React in an oven at 120°C for 12 hours, cool the reaction with V 甲醇 :V DMF =1: 4 washes 3 times and centrifuged at 8000rpm for 5 minutes; vacuum-dried the centrifuged and washed material at 60°C for 12h; treated the dried sample at 900°C for 3h under a nitrogen atmosphere, and then naturally cooled to room temperature to obtain The catalyst material; the high-temperature-treated material was soaked in 5% HF solution for 2h, washed with water again for 3 times and centrifuged at 8000rpm for 5 minutes, and the washed material was vacuum-dried for 12h at 60°C to obtain a MOF-based platinum single...

Embodiment 2

[0047] In this example, the platinum source is chloroplatinic acid, and the obtained MOF-based platinum single-atom material is Pt(IV)-SACs material.

[0048] Dissolve 210mg of zirconium chloride, 163mg of 2-aminoterephthalic acid and 0.5mL (1mg / mL) of chloroplatinic acid in 40mL of dimethylformamide and 4.8mL of glacial acetic acid, put them in vials and react in an oven at 120°C 12h, after the reaction is cooled, use V 甲醇 :V DMF = 1: 4 washes 3 times and centrifuged at 8000rpm for 5 minutes; the centrifuged and washed material was vacuum-dried at 60°C for 12h; the dried sample was treated at 1000°C for 3h under a nitrogen atmosphere, and then naturally cooled to room temperature to obtain The catalyst material; the high-temperature-treated material was soaked in 5% HF solution for 2h, washed with water again for 3 times and centrifuged at 8000rpm for 5 minutes, and the washed material was vacuum-dried for 12h at 60°C to obtain a MOF-based platinum single-atom catalyst (Pt ...

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Abstract

The invention belongs to the technical field of electrochemical energy, and provides an MOF-based platinum monatomic catalyst, preparation and application. Zirconium chloride, 2-aminoterephthalic acid and a platinum source are used as raw materials, a regulating acid is used for regulating the nucleation speed of a metal framework, and the MOF-based platinum monatomic catalyst is synthesized in situ through a solvothermal method. The molar ratio of the zirconium chloride to the 2-aminoterephthalic acid to the platinum source is 0.9: 0.9: (0.5-3), and the high-temperature carbonization temperature is 800-1000 DEG C. The catalyst takes a metal framework as a monatomic carrier, and platinum is dispersed on the metal framework in a monatomic dispersion state. The catalyst is applied to a fuel cell cathode, a fuel cell cathode electrode with high electrochemical performance is prepared, the half slope point position of the electrode in a 0.1 M KOH solution is 0.75 V, and the stability of the electrode in an ammonia solution is higher than that of commercial platinum carbon. The preparation method is simple, the cost of the catalyst is reduced to a great extent, and popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy, and specifically relates to a MOF-based platinum single-atom catalyst, its preparation and application. Background technique [0002] Commercial platinum-carbon catalysts have low stability, poor toxicity resistance, and high platinum loading, resulting in high catalyst costs. Therefore, the development of new catalysts with strong toxicity resistance and low cost is the direction of everyone's efforts. [0003] As a new class of catalysts, single-atom catalysts are characterized by their atomic dispersion on the support, and have received more and more attention. Single-atom catalysts have the greatest atomic efficiency for oxidation, hydrogenation, electrocatalysis, etc. The reaction exhibited excellent catalytic performance. Unfortunately, given the high surface energy, individual atoms are often mobile and prone to aggregation. The preparation of stable single-atom catalysts ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/92
CPCH01M4/926H01M4/921H01M4/8652Y02E60/50
Inventor 张存满张晶晶肖强凤李冰
Owner TONGJI UNIV
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