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Carbide-loaded noble metal monatomic catalyst and preparation and application thereof

A precious metal and catalyst technology, applied in the field of preparation of carbide-supported precious metal single-atom catalysts, can solve the problems of difficulty in exposing electrochemically active sites, affecting hydrogen production activity and stability, harsh preparation process conditions, etc. The effect of distribution, high specific surface area, and simple synthesis process

Pending Publication Date: 2022-05-24
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in most cases, the preparation process of carbides is harsh and easy to aggregate, and noble metals are more inclined to form nanoparticles, which makes it difficult to expose more electrochemically active sites, which seriously affects the improvement of hydrogen production activity and stability.

Method used

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  • Carbide-loaded noble metal monatomic catalyst and preparation and application thereof
  • Carbide-loaded noble metal monatomic catalyst and preparation and application thereof
  • Carbide-loaded noble metal monatomic catalyst and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 01-12

[0030] Example 01-12 Preparation method of platinum single-atom catalyst supported by molybdenum carbide with Pt-NENU-5 as precursor

[0031] 1) Mix a certain quality of phosphomolybdic acid, 0.3 g of copper acetate, 0.1 g of glutamic acid, 0.2 g of trimesic acid, and a certain quality of chloroplatinic acid, and stir to obtain a Pt-NENU-5 precursor;

[0032] 2) Heat treatment of the Pt-NENU-5 precursor obtained in 1) in a tube furnace at 2°C for min -1 The heating rate was raised to 800 °C, calcined under argon atmosphere for 6 h, and then naturally lowered to room temperature;

[0033] 3) Disperse the catalyst obtained in 2) in 0.5M H 2 SO 4 , stirred at 50 °C for 1 h to obtain Pt 1 -Mo 2 Table 1 shows the amount of C-C catalyst, phosphomolybdic acid and chloroplatinic acid.

[0034] 4) Electrochemical test: take 4 mg of the catalyst prepared in step 3) and add it to 460 μl of alcohol, 500 μl of water and 40 μl of a 0.05% Nafion mixed solution with a mass concentration ...

Embodiment 13-24

[0038] Example 13-24 Preparation method of platinum carbide supported palladium single-atom catalyst with Pd-NENU-5 as precursor

[0039] 1) Mix a certain amount of phosphomolybdic acid and palladium chloride, 0.3g copper acetate, 0.15g glutamic acid, 0.2g trimesic acid, and stir to obtain Pd-NENU-5;

[0040] 2) Heat treatment of the Pd-NENU-5 precursor obtained in 1) in a tube furnace at 2 °C min -1 The heating rate was increased to 700 °C, calcined under nitrogen atmosphere for 6 h, and cooled to room temperature naturally;

[0041] 3) Disperse the catalyst obtained in 2) in 0.5M H 2 SO 4 in 50 °C stirring for 1 h to prepare the catalyst. The consumption of phosphomolybdic acid and palladium chloride is shown in Table 2.

[0042] 4) The electrochemical test method is the same as that of Example 01-12. like Figure 4 showed that the onset potential of catalyst 15 was -0.1 V and reached 10 mA cm -2 The required overpotential is 0.181 V, and the HER activities of Example...

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Abstract

The invention relates to a preparation method of a carbide-loaded noble metal monatomic catalyst, and belongs to the technical field of electro-catalytic materials. The technical problems of high preparation cost and low metal utilization rate of a noble metal catalyst for an electrochemical hydrogen production reaction at present are solved. In the synthesis process of a metal organic framework precursor, noble metal ions are introduced to be complexed with heteropolyacid and embedded into an organic framework pore channel in a self-assembly mode, and the precursor is subjected to high-temperature heat treatment and acid etching to obtain the carbide-loaded noble metal monatomic catalyst. The result shows that the loaded noble metal is uniformly dispersed on the carbide nanoparticles in a monatomic form. The catalyst shows good activity in alkaline electrochemical hydrogen evolution reaction. The preparation process of the catalyst is simple and easy to implement, the utilization rate of precious metal is remarkably increased, the cost of the electrocatalyst is effectively reduced, and the catalyst has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation and electrochemistry, relates to a preparation method of an electrocatalyst applied to an electrochemical hydrogen evolution reaction, and in particular relates to a preparation method of a carbide-supported noble metal single-atom catalyst. Background technique [0002] At present, energy and environmental issues have greatly promoted the development and utilization of clean energy. Among them, hydrogen energy with high energy density and renewable energy is a potential energy carrier that can replace traditional fossil fuels. Hydrogen energy will play an important role in the future energy pattern, and its development and application are of great strategic significance. Among the many hydrogen production technologies, hydrogen production by electrolysis of water is environmentally friendly and has high product purity, which is one of the best ways to lead to the future "hydrogen eco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J35/10C25B11/093C25B1/04
CPCB01J27/22C25B11/04C25B1/04B01J35/33B01J35/61Y02P20/133
Inventor 王爱琴钮珊珊张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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