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A composite piezoelectric catalyst and its preparation and application

A catalyst and a composite technology, which are applied to composite piezoelectric catalysts and their preparation and application in the field of acoustic catalytic splitting of water for hydrogen production, can solve the problem of single piezoelectric semiconductors, the hydrogen production efficiency needs to be improved, and the mechanical energy-hydrogen can not be satisfied. Can transfer technology development needs and other issues

Inactive Publication Date: 2021-04-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few studies on the use of the piezoelectric effect of catalysts to split pure water and generate hydrogen reported at home and abroad, only involving hexagonal ZnO fibrous microcrystals, tetragonal BaTiO 3 Dendritic crystallites ( J. Phys. Chem. Lett . 2010 , 1 , 997–1002), the sound-driven hydrogen production catalyst used is a single piezoelectric semiconductor, and its hydrogen production efficiency needs to be improved, which cannot meet the development needs of mechanical energy-hydrogen energy conversion technology

Method used

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  • A composite piezoelectric catalyst and its preparation and application
  • A composite piezoelectric catalyst and its preparation and application
  • A composite piezoelectric catalyst and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Alcothermal Synthesis of ZnO Nanorods with Excellent Piezoelectric Properties

[0025] Weigh 0.330 g of (C 4 h 6 NO 4 ) 2 Zn (1 mmol) and 0.56 g of KOH (10 mmol) were dissolved in 10 mL and 20 mL of n-propanol, respectively; then the two reactant alcohol solutions were slowly mixed and stirred for 30 min to make the precursors evenly mixed After that, the reaction kettle was covered and sealed, put into a stainless steel sleeve and locked, placed in a programmed temperature-raising blast oven, and raised from room temperature to 150 °C over 60 minutes, and naturally dropped to room temperature after 24 hours of heat preservation; the obtained precipitation was deionized with After washing with water for 6 times until the ion concentration of the mother solution dropped below 10 ppm, it was then transferred to a vacuum oven at 60 °C for 24 h to obtain a white powder, namely ZnO nanorods with excellent piezoelectric properties.

Embodiment 2

[0026] Example 2 Synthesis of ZnO-Au Composite Piezoelectric Catalyst by Defect Reduction Method

[0027] Weigh 50 mg of the zinc oxide nanorods obtained in Example 1, and disperse it in 50 mL of deionized water, then add 2.5 mL of 0.02 g / mL HAuCl 4 4H 2 O, and stirred for 4 h under dark conditions, the oxygen vacancy defects on the surface of ZnO were used to reduce gold ions to simple gold, which was loaded on the surface of nanorods. After the reduction, the sample was washed 4 times with deionized water until the ion concentration of the mother solution dropped below 10 ppm, and then transferred to a vacuum oven at 60 °C for 24 h to obtain a purple powder, which is the ZnO-Au composite piezoelectric catalyst.

Embodiment 3

[0028] Example 3 Structural Characterization

[0029] The sample that embodiment 1, 2 is made is scanned by X-ray diffractometer, and the results are shown in figure 1 . Depend on figure 1 It can be determined that the obtained samples are hexagonal wurtzite crystal ZnO and ZnO-Au composites, respectively.

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Abstract

The invention discloses a composite piezoelectric catalyst, its preparation and its application in sonocatalytic cracking of water to produce hydrogen. It uses the oxygen vacancy defects on the surface of zinc oxide to reduce gold ions on the surface of zinc oxide nanorods to form gold element in situ, thereby preparing ZnO‑Au composite piezoelectric catalysts; among them, zinc oxide nanorods with special orientation can pass through The piezoelectric effect enriches the sound wave energy in the environment and generates positive and negative charges on the surface, thereby driving the decomposition of pure water to generate hydrogen gas. After the simple gold is loaded, the hydrogen production performance of the ZnO‑Au composite piezoelectric catalyst is greatly improved. The hydrogen production rate driven by ultrasonic waves is 4 times that of unloaded zinc oxide nanorods, which breaks the limitation of a single piezoelectric material as an acoustic catalyst, realizes the efficient use of acoustic energy, and provides a basis for hydrogen production by cracking water using the piezoelectric effect. A new approach has been found, which has broad application prospects in the field of mechanical energy-hydrogen energy conversion, and its preparation method is simple and suitable for industrial production.

Description

technical field [0001] The technical field of catalytic materials of the present invention particularly relates to a composite piezoelectric catalyst and its preparation and application in hydrogen production by sonocatalytic cracking of water. Background technique [0002] The rapid expansion of population, the rapid development of economy, and the excessive exploitation and consumption of fossil energy have caused the worldwide problem of energy shortage. At present, many countries around the world have formulated corresponding policies to address the energy shortage problem, so as to promote the sustainable development of social economy. As a clean and pollution-free renewable energy, hydrogen energy is particularly important for the development of industrial production and national economy. [0003] Using the abundant renewable energy in nature to directly drive the water splitting reaction with the assistance of energy conversion materials can convert low-density energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52C01B3/04
CPCB01J23/52B01J35/0033C01B3/042C01B2203/0277Y02E60/36
Inventor 刘平王凯强叶云黄学烟赵燕雷瑞高帆
Owner FUZHOU UNIV
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