Platinum monatomic catalyst and preparation method and application thereof

A catalyst and atomic technology, applied in the direction of electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of harsh preparation conditions, difficulty in mass production of catalysts, and low loading capacity, and achieve mild and simple preparation methods, high utilization of precious metals, and stability good sex effect

Active Publication Date: 2022-01-04
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Single-atom catalysts have the characteristics of high atom utilization, good catalytic activity, and excellent selectivity, and have attracted extensive attention from researchers. However, the preparation conditions of most single-atom catalysts are harsh and the loading is low, making it difficult to achieve mass production of catalysts.

Method used

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  • Platinum monatomic catalyst and preparation method and application thereof
  • Platinum monatomic catalyst and preparation method and application thereof
  • Platinum monatomic catalyst and preparation method and application thereof

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preparation example Construction

[0039]A preparation method of a platinum single-atom catalyst, comprising the steps of:

[0040] Step S1, dissolving the oxidized carbon nanotubes in deionized water from which oxygen has been removed;

[0041] Specifically, the process for oxidation treatment of carbon nanotubes is as follows:

[0042] Dissolve carbon nanotubes, potassium nitrate, and potassium permanganate into concentrated sulfuric acid, add an appropriate amount of deionized water after a period of reaction, and ensure that the temperature does not exceed 80°C during the dropping process, and then add an appropriate amount of hydrogen peroxide, and the reaction will be stable. After a period of time, the solution is washed to neutrality, and then freeze-dried to obtain oxidized carbon nanotubes;

[0043] The amount of carbon nanotubes to be oxidized is to dissolve 0.2-1mg of carbon nanotubes in 1ml of deionized water, and adopt an ultrasonic dispersion process to obtain a uniformly dispersed carbon nanotu...

Embodiment 1

[0052] Weigh 1g of carbon nanotubes, 0.3g of potassium nitrate and 1g of potassium permanganate and dissolve them in 50ml of concentrated sulfuric acid. After reacting for 6 hours, add 230ml of deionized water. During the dropping process, ensure that the temperature does not exceed 80°C, and then add 2ml of hydrogen peroxide, reacted for 1 hour, washed the solution until neutral, and finally freeze-dried to obtain oxidized carbon nanotubes. Weigh 10 mg of oxidized carbon nanotubes and dissolve them in 40 ml of deionized water that has been passed through nitrogen gas for 30 minutes, and ultrasonically disperse for 30 minutes to obtain a uniformly dispersed carbon nanotube solution. Then weigh the hexamethylenetetramine of 2mmol, the ammonium fluoride of 0.6mmol, the nickel chloride hexahydrate of 0.2mmol, the ferrous chloride tetrahydrate of 0.1mmol, and the uniformly dispersed carbon nanotube solution are added together In a 100ml reactor, react at 120°C for 6h, filter and w...

Embodiment 2

[0054] Weigh 1g of carbon nanotubes, 0.3g of potassium nitrate and 1g of potassium permanganate and dissolve them in 50ml of concentrated sulfuric acid. After reacting for 6 hours, add 230ml of deionized water. During the dropping process, ensure that the temperature does not exceed 80°C, and then add 2ml of hydrogen peroxide, reacted for 1 hour, washed the solution until neutral, and finally freeze-dried to obtain oxidized carbon nanotubes. Weigh 10 mg of oxidized carbon nanotubes and dissolve them in 40 ml of deionized water that has been passed through nitrogen gas for 30 minutes, and ultrasonically disperse for 30 minutes to obtain a uniformly dispersed carbon nanotube solution. Then weigh the hexamethylenetetramine of 2mmol, the ammonium fluoride of 0.6mmol, the nickel chloride hexahydrate of 0.2mmol, the ferrous chloride tetrahydrate of 0.1mmol, and the uniformly dispersed carbon nanotube solution are added together In a 100ml reactor, react at 120°C for 6h, filter and w...

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Abstract

The invention provides a platinum monatomic catalyst which is structurally Pt-Ni<x>Fe<1-x>(OH)<2> / CNTs nanosheets, wherein x ranges from 1 / 5 to 1 / 2. The preparation method comprises the following steps of: dissolving carbon nanotubes subjected to oxidation treatment in deionized water without oxygen; dissolving a proper amount of hexamethylenetetramine, ammonium fluoride, nickel chloride hexahydrate and ferrous chloride tetrahydrate into the solution in the step S1, the molar ratio of Ni to Fe in the nickel chloride hexahydrate and the ferrous chloride tetrahydrate being (1-4): 1; reacting the mixed solution in the step S2 in a sealed reaction kettle to obtain a Ni<x>Fe<1-x> (OH)<2> / CNTs catalyst; and adding a proper amount of H2PtCl6. 6H2O into the Ni<x>Fe<1-x> (OH)<2> / CNTs catalyst in the step S3, and oxidizing at room temperature to obtain a platinum monatomic catalyst Pt-Ni<x>Fe<1-x>(OH)<2> / CNTs, the molar ratio of Pt to Fe being 1: (1-4). The platinum monatomic catalyst provided by the invention has the characteristics of high platinum monatom loading capacity, high metal utilization rate, good catalytic activity and the like, and can be widely applied to the fields of electrolysis of water, air batteries and the like. The invention also provides a preparation method of the platinum monatomic catalyst and application of the platinum monatomic catalyst in electrolysis of water.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a platinum single-atom catalyst and its preparation method and application. Background technique [0002] Hydrogen plays an important role in chemical production and is also an environmentally friendly substitute for fossil fuels. The preparation of efficient, low-cost, and high-stability catalysts is an important topic in hydrogen energy research. Hydrogen production by electrolysis of water has the characteristics of high efficiency and no pollution, and is widely used in the development and research of hydrogen energy. Among them, the four-electron transfer pathway of the anode oxygen evolution reaction is the difficulty that hinders the improvement of the efficiency of hydrogen production by electrolysis of water. Therefore, a large number of OER catalysts It is designed to reduce the overpotential and accelerate the reaction kinetics to bring about higher energy conversion...

Claims

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Application Information

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IPC IPC(8): C25B11/055C25B11/081C25B1/04
CPCC25B11/055C25B11/081C25B1/04Y02E60/36
Inventor 马炜王丽明胡婷婷周震
Owner ZHENGZHOU UNIV
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