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Perovskite-solid solution composite photocatalyst used for photocatalytic water splitting to generate hydrogen

A solid solution and catalyst technology, which is applied in the field of perovskite-solid solution composite photocatalysts, can solve the problems of poor stability, low activity, and low quantum efficiency, and achieve the effects of improving stability, inhibiting recombination, and increasing output

Inactive Publication Date: 2019-04-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a perovskite-solid solution composite photocatalyst for photolysis of water to produce hydrogen, which aims at the deficiencies of existing materials and synthesizes a composite photocatalyst with better stability and activity. The catalyst can effectively promote the separation of photogenerated carriers, improve the efficiency of photoreaction, and at the same time prevent the oxidation of the catalyst itself, which solves the shortcomings of traditional photocatalysts such as poor stability, low activity, and low quantum efficiency.

Method used

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  • Perovskite-solid solution composite photocatalyst used for photocatalytic water splitting to generate hydrogen
  • Perovskite-solid solution composite photocatalyst used for photocatalytic water splitting to generate hydrogen
  • Perovskite-solid solution composite photocatalyst used for photocatalytic water splitting to generate hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 LaNiO 3 / Cd 0.9 Zn 0.1 Preparation of S composite catalyst

[0023] Dissolve 0.433g (1mmol) lanthanum nitrate and 0.290g (1mmol) nickel nitrate hexahydrate in 80mL deionized water, then add 20mL aqueous solution containing 0.3g (7.5mmol) sodium hydroxide, reflux at 60°C for 4h, the resulting precipitate After washing and drying, it was calcined at 650°C for 2 hours in an air atmosphere to obtain LaNiO 3 .

[0024] Take 4.797g (21mmol) of cadmium acetate and 0.439g (2.3mmol) of zinc acetate and dissolve them in a mixture of 30mL of ethylenediamine and 30mL of water, add 1.972g (26mmol) of thioacetamide, stir for 30min, and then transfer the solution to 100mL polytetrafluoroethylene stainless steel autoclave, and hydrothermal reaction at 200°C for 24h, finally washed with deionized water and ethanol, and dried at 60°C for 24h to obtain Cd 0.9 Zn 0.1 S solid solution.

[0025] LaNiO 3 and Cd 0.9 Zn 0.1 S was added to 20mL ethanol solution in proportion,...

Embodiment 2

[0026] Example 2 LaNiO 3 / Cd 0.8 mn 0.2 Preparation of S composite catalyst

[0027] Dissolve 0.433g (1mmol) lanthanum nitrate and 0.290g (1mmol) nickel nitrate hexahydrate in 80mL deionized water, then add 20mL aqueous solution containing 0.3g sodium hydroxide (7.5mmol), reflux at 60°C for 4h, the resulting precipitate After washing and drying, it was calcined at 650°C for 2 hours in an air atmosphere to obtain LaNiO 3 .

[0028] Take 4.264g (18mmol) of cadmium acetate and 0.7785g (4.5mmol) of manganese acetate and dissolve them in a mixture of 30mL of ethylenediamine and 30mL of water, add 1.737g (23mmol) of thioacetamide, stir for 30min, and then transfer the solution to 100mL polytetrafluoroethylene stainless steel autoclave, and hydrothermal reaction at 160°C for 24h, finally washed with deionized water and ethanol, and dried at 60°C for 24h to obtain Cd 0.8 mn 0.2 S solid solution.

[0029] LaNiO 3 and Cd 0.8 Zn 0.2 S was added to 20mL ethanol solution in propo...

Embodiment 3

[0032] Example 3 LaNiO 3 / Cd x m (1-x) Evaluation of Hydrogen Production Activity of S Photolysis Water

[0033] Embodiment 1 and 2 gained LaNiO 3 / Cd x m (1-x) The evaluation experiment of the hydrogen production efficiency of S composite photocatalyst by photolysis of water was carried out on the Pofilai photolysis device, and Shimadzu 8A gas chromatograph was used to detect H 2 output. The experimental process is as follows: add 20 mg of the obtained composite photocatalyst to 100 mL of deionized water, and add 0.35 M Na 2 S / 0.25M Na 2 SO 3 As a hole sacrificial agent, use a xenon lamp as the light source and add a 420nm cut-off filter to carry out the photolysis reaction on the photowater splitting device. The system is vacuumed and the reaction temperature is 10°C. Illumination is carried out, and the H in the system is detected every 1h 2 content, the reaction was terminated after 5h.

[0034] image 3 For embodiment 1, 2 gained Cd x m (1-x) S. LaNiO 3 / Cd...

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Abstract

The invention discloses a perovskite-solid solution composite photocatalyst used for photocatalytic water splitting to generate hydrogen. The perovskite-solid solution composite photocatalyst is prepared in the steps that a perovskite material LaNiO3 is synthesized by using a coprecipitation method; a CdxM(1-x)S solid solution is prepared by using a hydrothermal method; the LaNiO3 and the CdxM(1-x)S solid solution are simply compounded by using an ethanol method to prepare the LaNiO3 / CdxM(1-x)S composite photocatalyst. Through a composite structure formed between the LaNiO3 and the CdxM(1-x)S,the composite photocatalyst can promote transfer of photon-generated carriers and inhibit compounding of light-generated electrons and electron holes, and therefore, the efficiency of generating thehydrogen through photocatalytic water splitting is obviously improved, and the photocorrosion phenomenon existing in a traditional photocatalyst can be relieved. Besides, the preparation method of thecomposite photocatalyst is simple and easy to implement and mild in reaction condition, and the perovskite-solid solution composite photocatalyst has wide application prospects in the aspects of development of alternative energy sources of fossil fuel, efficient utilization of solar energy and the like.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by photolysis of water, and in particular relates to a perovskite-solid solution composite photocatalyst for hydrogen production by photolysis of water. Background technique [0002] As we all know, energy is an important material basis for human development and progress, and plays a key role in promoting economic and social development. However, with the rapid economic development and rapid population increase, the consumption of limited traditional fossil energy has increased rapidly, which has also brought many environmental problems. Therefore, energy shortage and increasingly serious environmental problems will seriously affect the normal development of society. Therefore, the development of new sustainable green energy is one of the major issues that the scientific community urgently needs to solve. Hydrogen energy is a new type of clean energy. As a renewable secondary energy ...

Claims

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Application Information

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IPC IPC(8): B01J27/043C01B3/04
CPCC01B3/042B01J27/043B01J35/39Y02E60/36Y02P20/133
Inventor 丁正新许俊丽员汝胜龙金林孙春芳李佳伟王兆宇
Owner FUZHOU UNIV
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