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Preparation and application of monatomic platinum catalyst based on MXene quantum dots

A platinum catalyst, quantum dot technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as low yield

Pending Publication Date: 2021-01-26
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrocatalytic nitrogen reduction ammonia production process is facing great challenges due to the low yield and the competitive hydrogen evolution reaction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1: Add 0.5 g Ti 3 AlC 2 The powder was dispersed into 10 ml of 48% HF acid solution, and stirred at room temperature for 24 h for etching. Then the obtained dispersion was centrifuged and washed several times with deionized water at 3500 rpm for 10 min until the pH of the dispersion reached 5-6 to completely remove residual HF and impurities, and dried at 80 °C for 12 h to obtain poly Layer Ti 3 C 2 MXene powder.

[0017] The second step: in the environment of inert gas protection, the multilayer Ti 3 C 2 MXene was ultrasonically dispersed into 20 ml deionized water, the pH value of the mixed solution was adjusted to 9 with ammonia water, the mixed solution was transferred to a 75 ml autoclave, and reacted at 100 °C for 6 h, and the precipitate was filtered with a 220 nm filter membrane, and in Dialyzed in deionized water for 48 h to obtain MXene quantum dots.

[0018] Step 3: Take 20 mg•mL -1 Put the aqueous solution of MXene quantum dots into the beaker...

Embodiment 2

[0022] As described in Example 1, the difference is that in the fourth step, the obtained solid is acid-washed, and the obtained solid is not replaced by acid-washing to obtain an unwashed MXene quantum dot-based metal platinum particle catalyst.

Embodiment 3

[0024] As described in Example 1, the difference is that the concentration of the MXene quantum dot solution in the third step is 20 mg mL -1 The concentration of MXene quantum dot solution is 25 mg·mL -1 replace.

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PUM

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Abstract

The invention provides preparation and application of a monatomic platinum catalyst based on MXene quantum dots. MXene quantum dots are used as a carrier, and a certain amount of chloroplatinic acid and molten salt are added to obtain a mixed solution; the mixed solution is stirred, frozen and dried, high-temperature calcination on the obtained solid powder under the protection of an inert atmosphere is carried out, and acid pickling, washing and drying are then carried out to obtain the novel monatomic platinum catalyst taking the MXene quantum dots as the carrier. The catalyst has very highcatalytic activity on electrocatalytic nitrogen reduction reaction, the ammonia yield under -0.2 V (relative to a standard hydrogen electrode) reaches up to 80.3 mug h<-1> mg<-1> cat., the Faraday efficiency reaches 7.3%, and the catalyst is a potential electrocatalytic nitrogen reduction catalyst material.

Description

technical field [0001] The invention relates to the preparation and application of a single-atom platinum catalyst based on MXene quantum dots, and belongs to the technical field of single-atom electrocatalysis. Background technique [0002] With the growing population and the continuous consumption of fossil fuels, the development of green energy and energy storage materials has become a major challenge for social development. Ammonia acts as a high-energy-density carrier to efficiently collect, store, and transport renewable energy without releasing greenhouse gases. At present, the main method of producing ammonia is the Haber process, which requires high temperature and high pressure, high energy consumption and serious pollution. Therefore, the reduction of nitrogen to ammonia under ambient conditions is an attractive technology. [0003] Electrocatalytic nitrogen reduction reactions driven by renewable energy sources have attracted extensive attention due to their fa...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J23/42B01J37/10B01J37/08C25B1/27C25B11/081C25B11/067B22F9/24
CPCB01J27/22B01J23/42B01J37/10B01J37/08C25B1/00B22F9/24B01J35/33
Inventor 郭亚莉成永华褚克李晓甜
Owner LANZHOU JIAOTONG UNIV
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