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A kind of photocatalyst and its preparation method and the application in photolysis water hydrogen production

A technology of photolysis of water to produce hydrogen and photocatalyst, which is applied in the field of new energy technology and photocatalytic materials, can solve the problem of not much hydrogen production, and achieve the effect of increasing the hydrogen production rate

Inactive Publication Date: 2017-05-17
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The research on heteropolyacids mainly focuses on industrial catalytic synthesis, and their applications in the field of photocatalysis are gradually expanding, but most of them focus on the degradation of pollutants, and there are not many applications in hydrogen production.

Method used

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  • A kind of photocatalyst and its preparation method and the application in photolysis water hydrogen production
  • A kind of photocatalyst and its preparation method and the application in photolysis water hydrogen production
  • A kind of photocatalyst and its preparation method and the application in photolysis water hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of Photocatalyst Au / G-Cs x h 3-x PW 12 o 40 In the series Au / G-CsPW (1:2) (phosphotungstic acid and Cs 2 CO 3 The molar ratio is 1:2):

[0058] (1) In a 0.1mol / L sodium sulfate solution, use platinum as the cathode and graphite as the anode with a distance of 1cm, apply a voltage of 10V, react, and continuously adjust the current so that the current is slightly lower than 2A, and disperse the solution ultrasonically after 30 minutes , centrifugal (8000r / min), the supernatant is a graphene mixture (abbreviated as G);

[0059] (2)G-Cs 2 h 1 PW 12 o 40 Preparation (phosphotungstic acid and Cs 2 CO 3 The molar ratio is 1:2): Take 50mL of the supernatant, add 1g of phosphotungstic acid to it, stir vigorously for 0.5 hours, and take 0.2263g of Cs 2 CO 3 , dissolved in 10mL distilled water, added dropwise, stirred and reacted for 1.5 hours to obtain a suspension, which was centrifuged, washed with water, dried, and ground to obtain G-Cs 2 h 1 PW 12 ...

Embodiment 2

[0063] CsPW(1:2) (phosphotungstic acid and Cs 2 CO 3 Molar ratio is 1:2) preparation: 1g phosphotungstic acid (H 3 PW 12 o 40 ) was dissolved in 50mL distilled water, and 0.2263g of Cs was taken 2 CO 3 , dissolved in 10mL of distilled water, added dropwise to the phosphotungstic acid solution, stirred vigorously, and reacted for 2 hours, the suspension was centrifuged, dried, and ground to obtain CsPW (1:2).

[0064] CsPW (1:3) (phosphotungstic acid and Cs 2 CO 3 Molar ratio is 1:3) the preparation process is the same as above, change Cs 2 CO 3 The mass of 0.3394g.

Embodiment 3

[0066] The photocatalyst CsPW (1:2) (phosphotungstic acid and Cs of 50mg embodiment 2 preparations 2 CO 3 The molar ratio is 1:2), add it into the light reactor that has been added with 40mL distilled water and 10mL methanol, put the gasket and the quartz cover in turn, connect the light reactor, vacuumize the system, turn on the light source, and light reaction for 18h. Connect the carrier gas and power gas, and use the CEL-SPH2A automatic online test system for hydrogen production from photolysis of water to take samples and test them at intervals of 3 hours.

[0067] CsPW (phosphotungstic acid and Cs 2 CO 3 The molar ratio is 1:3, prepared in Example 2) The operation of producing hydrogen by photolysis of water is the same as above.

[0068] figure 1 It is a comparison chart of hydrogen production efficiency of CsPW(1:2) and CsPW(1:3) photolysis of water. It can be seen from the figure that for CsPW(1:2) and CsPW(1:3), the amount of hydrogen produced gradually increase...

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Abstract

The invention discloses a photocatalyst, a preparation method of the photocatalyst and application of the photocatalyst in photocatalytic water splitting for hydrogen production. The preparation method of the photocatalyst comprises the following steps: (1) carrying out electrolysis in sodium sulphate solution by taking a platinum sheet as a cathode and graphite as an anode, performing ultrasonic dispersion to solution after electrolysis, then centrifuging, and taking liquid supernatant as graphene mixture and marking as G; (2) adding phosphotungstic acid into the graphene mixture, stirring intensely, dropwise adding Cs2CO3 solution, performing stirring reaction to obtain suspension liquid, and carrying out centrifugation, washing, drying and grinding to the suspension liquid sequentially to obtain an intermediate product-G-CsxH(3-x)PW12O40; and (3) dissolving the intermediate product into distilled water, adding chloroauric acid solution, carrying out illumination reaction in an oxygen-free environment, concentrating and drying reaction liquid when to-be-reacted liquid is changed to be dark violet from white, and grinding. The photocatalyst prepared by the method has high visible-light response degree and can be applied to the photocatalytic water splitting for hydrogen production, and the yield of hydrogen gas is increased greatly.

Description

technical field [0001] The invention relates to the technical fields of new energy technology and photocatalytic materials, in particular to a photocatalyst, a preparation method thereof and an application in hydrogen production by photolysis of water. Background technique [0002] Heteropolyacids (POM) are highly ordered and structurally complete molecular ions constructed from high-valent metal ions and oxygen. with semiconductor TiO 2 Similar to the conduction band of POM, POM can also be used as a "reservoir" of electrons, that is, it can accept multiple electrons while keeping its basic M-O structure unchanged. It is a photocatalytic material with broad application prospects. At present, based on the high water solubility and low specific surface area of ​​most POMs, the heterogeneity of homogeneous POMs is generally achieved by loading or ion chemical deposition, thereby increasing the specific surface area of ​​POMs and realizing easy separation and recovery. Howeve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/188C01B3/04
CPCY02E60/36
Inventor 王齐石晓东周甜甜朱纳鑫王强姬云刘妍秋胡含蕾丛燕青
Owner ZHEJIANG GONGSHANG UNIVERSITY