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Preparation method of efficient atomic-scale tungsten dispersion catalyst, product and application

A catalyst and atomic technology, applied in the direction of electrolysis components, electrodes, electrolysis process, etc., can solve the problems of limited improvement of catalyst catalytic effect, difficulty in realizing catalytic activity, complicated process, etc., and achieve the effect of low cost, easy operation and high purity

Active Publication Date: 2022-01-07
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods have limited improvement in the catalytic effect of the catalyst, especially the catalytic activity of high current density is difficult to achieve; and in the preparation process, there are problems such as complex process and high cost.

Method used

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  • Preparation method of efficient atomic-scale tungsten dispersion catalyst, product and application
  • Preparation method of efficient atomic-scale tungsten dispersion catalyst, product and application
  • Preparation method of efficient atomic-scale tungsten dispersion catalyst, product and application

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Experimental program
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preparation example Construction

[0030] Co of the present invention 9 S 8 The preparation method belongs to the conventional preparation method of the prior art, which can refer to the literature (Adv. Energy Mater. 2020, 10, 1903137), and will not be described in detail herein.

[0031] The instrument used in the embodiment has:

[0032] Powder X-ray diffractometer (model is: rational science RigakuD / Max-2000 rotating target, wherein copper K α radiation diffractometer In the study, the continuous scanning mode was used for phase identification, the scanning voltage for qualitative phase analysis was set to 40kV, the current was set to 100mA, and the scanning range was 5-80°); scanning electron microscope (model: HitachiS-4800); Transmission electron microscope (model: JEM-2100); high-resolution transmission electron microscope (model: JEM-2100F); spherical aberration-corrected transmission electron microscope (model: FEI Titan Themis G2); synchrotron radiation extended edge X-ray absorption fine structu...

Embodiment 1

[0035] (1) 6 mg of ammonium metatungstate ((NH 4 ) 6 W 7 o 24 4H 2 O) be dissolved in a beaker containing 20mL octylamine solution, then, add 1.0g of Co 9 S 8 , stirred at room temperature for 15 minutes to obtain a precursor;

[0036] (2) Place the precursor in an autoclave, and put it into an electric blast drying oven at a temperature of 200 °C for 24 h at a constant temperature to obtain a two-dimensional W-Co 9 S 8 nanosheet material;

[0037] (3) Take out the two-dimensional W-Co 9 S 8 The nanosheet material was naturally cooled to room temperature, the black solid precipitate was collected by centrifugation, and then washed 3 times with deionized water and ethanol, and the washed sample was kept at 70 °C for 24 h for drying, and the obtained product was Co 9 S 8 A catalyst loaded with 0.48 wt% atomically dispersed W, denoted as W-Co 9 S 8 .

Embodiment 2

[0039] With embodiment 1, the difference is that the ammonium metatungstate quality is 12mg in the step (1). According to the same preparation method as in Example 1, 0.95wt% tungsten-loaded W-Co 9 S 8 nanocrystals.

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Abstract

The invention discloses a preparation method of an efficient atomic-scale tungsten dispersion catalyst, a product and application, and belongs to the field of material synthesis. Co9S8 and ammonium metatungstate are mainly used as raw materials to react under a high-temperature condition, and the W-Co9S8 catalysts with different tungsten loading capacities are synthesized under control by changing the adding amount of metal tungsten salt. The obtained W-Co9S8 catalyst presents the morphology of two-dimensional nanosheets, and has high crystal purity and a thickness of about 20 nm. The catalytic activity of the catalyst as an anode material for hydrogen production through electrochemical water decomposition is also improved. The catalyst conforms to the research on the aspects of newest clean energy and sustainable hydrogen energy, and is particularly key for restraining CO2 emission caused by combustion of a large number of fossil fuels.

Description

technical field [0001] The invention relates to the field of material synthesis, in particular to a method for preparing an efficient atomic-level tungsten-dispersed catalyst and its product and application. Background technique [0002] Hydrogen energy is a clean, sustainable and promising alternative to fossil fuels to meet global energy demand. It is particularly important to use electrolyzed water to prepare clean, green and sustainable hydrogen energy to deal with the increasingly severe energy crisis and environmental pollution. However, at present, the catalysts of water electrolysis hydrogen production technology mainly rely on Pt, RuO 2 , IrO 2 Such as precious metal materials, its high cost, few reserves and other factors seriously restrict its wide use. Therefore, it is of great research significance to develop high-density, high-activity non-precious metal catalysts for hydrogen production from water electrolysis. [0003] Among many cobalt sulfides, Co 9 S ...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04Y02E60/36
Inventor 孙俊良王立刚
Owner PEKING UNIV
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