Catalyst for photocatalytic decomposition of water to produce hydrogen and preparation method thereof

A photocatalysis and catalyst technology, applied in the field of materials science, can solve the problems of unrealization, low cost and low output, and achieve the effect of low cost, high hydrogen performance and high specific surface area.

Inactive Publication Date: 2018-11-13
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of purpose of the present invention is in order to solve above-mentioned TiO 2 and TiO 2 The modified materials cannot decompose water to produce hydrogen under near-infrared light, and the PtOx / WN catalyst for photocatalytic water-splitting hydrogen production in the visible-near-infrared wide spectral region has technical problems such as high cost and low output. A catalyst for photocatalytic water splitting to produce hydrogen, WN / TiO with nanofibrous morphology 2 Composite material, the WN / TiO nanofiber morphology 2 Composite materials, low cost due to the absence of noble metals, and WN / TiO with nanofibrous morphology 2 Composite material achieved on TiO 2 The modification of the response in the ultraviolet-visible-near-infrared wide spectral range can realize the response to near-infrared light, and decompose water to generate hydrogen under the irradiation of near-infrared light, and the hydrogen yield can reach 10.8-15nmol·g -1 h -1 , and WN / TiO with nanofiber morphology 2 Composite materials are non-toxic and pollution-free

Method used

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  • Catalyst for photocatalytic decomposition of water to produce hydrogen and preparation method thereof
  • Catalyst for photocatalytic decomposition of water to produce hydrogen and preparation method thereof
  • Catalyst for photocatalytic decomposition of water to produce hydrogen and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A WN / TiO with Nanofiber Morphology 2 A composite material prepared by a method comprising the steps of:

[0066] (1), preparation of WN

[0067] Add 2.48g of phosphotungstic acid into 40ml of deionized water, stir to dissolve, add 3.3g of 2-methylimidazole, adjust the pH to 4-5 with 1M HCl aqueous solution, then transfer to a 50°C oil bath, heat and stir for 6h, and then Control the rotating speed at 8000r / min and centrifuge for 5min, and control the temperature of the obtained precipitate at 70°C for drying to obtain a W-containing precursor;

[0068] Then the W-containing precursor obtained above was placed in NH 3 In the atmosphere, control the heating rate of 5°C / min to 600°C for calcination for 3h for nitriding, and then naturally cool to room temperature to obtain WN;

[0069] (2), the 0.1gWN and 0.1gTiO obtained in step (1) 2 Disperse in 8ml DMSO, and ultrasonically peel for 60min under the control power of 300W to obtain WN and TiO 2 DMSO dispersion liquid,...

Embodiment 2

[0094] A WN / TiO with Nanofiber Morphology 2 A composite material prepared by a method comprising the steps of:

[0095] (1), preparation of WN

[0096] Add 2.48g of phosphotungstic acid into 40ml of deionized water, stir to dissolve, add 3.3g of 2-methylimidazole, adjust the pH to 4-5 with 1M HCl aqueous solution, then transfer to a 50°C oil bath, heat and stir for 6h, and then Control the rotating speed at 8000r / min and centrifuge for 5min, and control the temperature of the obtained precipitate at 70°C for drying to obtain a W-containing precursor;

[0097] Then the W-containing precursor obtained above was placed in NH 3 In the atmosphere, control the heating rate of 5°C / min to 600°C for calcination for 3h for nitriding, and then naturally cool to room temperature to obtain WN;

[0098] (2), the 0.1gWN and 0.05gTiO obtained in step (1) 2 Disperse in 8ml DMSO, and ultrasonically peel for 60min under the control power of 300W to obtain WN and TiO 2 DMSO dispersion liquid...

Embodiment 3

[0107] A WN / TiO with Nanofiber Morphology 2 A composite material prepared by a method comprising the steps of:

[0108] (1), preparation of WN

[0109] Add 2.48g of phosphotungstic acid into 40ml of deionized water, stir to dissolve, add 3.3g of 2-methylimidazole, adjust the pH to 4-5 with 1M HCl aqueous solution, then transfer to a 50°C oil bath, heat and stir for 6h, and then Control the rotating speed at 8000r / min and centrifuge for 5min, and control the temperature of the obtained precipitate at 70°C for drying to obtain a W-containing precursor;

[0110] Then the W-containing precursor obtained above was placed in NH 3 In the atmosphere, control the heating rate of 5°C / min to 600°C for calcination for 3h for nitriding, and then naturally cool to room temperature to obtain WN;

[0111] (2), the 0.1gWN and 0.03gTiO obtained in step (1) 2 Disperse in 8ml DMSO, and ultrasonically peel for 60min under the control power of 300W to obtain WN and TiO 2 DMSO dispersion liquid...

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Abstract

The invention discloses a catalyst for photocatalytic decomposition of water to produce hydrogen and a preparation method thereof. The catalyst for photocatalytic decomposition of water to produce hydrogen is a WN/TiO2 composite material having a nano-fiber morphology, contains five elements of W, Ti, N, C and O, has low photogenerated electron-hole composite ratio and can absorb ultraviolet-visible-near infrared light. The preparation method comprises the steps: firstly, preparing WN, then carrying out ultrasonic dispersion of WN and TiO2 in DMSO, then adding PAN, and carrying out electrostatic spinning of the obtained spinning solution; and drying obtained WN/TiO2 fibers, then carrying out primary calcination in air, then carrying out secondary calcination in NH3, and then cooling to room temperature to obtain the catalyst for photocatalytic decomposition of water to produce hydrogen. The catalyst successfully responds to ultraviolet, visible and near infrared light without noble metal doping. The preparation cost is low, the material is non-toxic and the performance is excellent. The catalyst has broad application prospects in photocatalytic decomposition of water to produce hydrogen.

Description

technical field [0001] The invention relates to a photocatalytic material, more specifically to a catalyst for photocatalytic water splitting to produce hydrogen, and belongs to the field of materials science. Background technique [0002] Hydrogen (H 2 ) has been considered as an ideal energy source because of its environmental friendliness and high energy capacity. Solar energy is the cheapest, most accessible and cleanest energy in nature. Since under ultraviolet light irradiation, TiO 2 Since the pioneering work of photocatalytic water splitting, photocatalytic water splitting to generate H 2 Has been widely used. [0003] Studies have shown that the use of photocatalytic technology to split water to produce hydrogen is expected to alleviate global energy problems. Generally, there are three key steps in the photocatalytic process in semiconductor catalysts: one is to generate carriers under light excitation, the other is to realize charge separation and migrate to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J27/24B01J35/004C01B3/042C01B2203/0277C01B2203/1041Y02E60/36
Inventor 闵宇霖巩帅奇范金辰徐群杰时鹏辉朱晟
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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