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All-solid-state vector Z mechanism composite photocatalyst CaTiO3/Cu/TiO2 as well as preparation method and application thereof

A composite photo-catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of cost limitation and application, and achieve the effects of reducing recombination efficiency, promoting separation, and increasing specific surface area

Active Publication Date: 2021-06-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high cost of noble metals as electron transfer mediators limits their applications
Therefore, finding cheap and stable metals to construct new vectored Z-mechanism photocatalysts for water splitting to produce hydrogen remains a great challenge.

Method used

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  • All-solid-state vector Z mechanism composite photocatalyst CaTiO3/Cu/TiO2 as well as preparation method and application thereof
  • All-solid-state vector Z mechanism composite photocatalyst CaTiO3/Cu/TiO2 as well as preparation method and application thereof
  • All-solid-state vector Z mechanism composite photocatalyst CaTiO3/Cu/TiO2 as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1)CaTiO 3 Preparation of photocatalyst

[0028] First, 1.18g Ca(NO 3 ) 2 4H 2 O was dissolved in 20mL of deionized water, stirred magnetically for 10min (the rotating speed of magnetic stirring was 300rpm), and then added 1.7mL [Ti(C 4 h 9 O) 4 ] and 0.4g NaOH. After another 1 h of magnetic stirring (the rotational speed of magnetic stirring was 300 rpm), the white suspension was transferred to a 30 mL polytetrafluoroethylene-lined stainless steel autoclave, and hydrothermally treated at 180 °C for 24 h. After the reaction, the reactor was naturally cooled to room temperature. Finally, the white precipitate was washed to neutral with dilute acetic acid solution, then centrifuged and washed several times with deionized water and absolute ethanol (centrifugal speed was 8000rpm), and dried at 60°C for 12h to obtain CaTiO 3 , the product mass is 0.4g.

[0029] 2)CaTiO 3 / Cu / TiO 2 Preparation of composite photocatalytic materials

[0030] 20mg Cu(CH 3 COO) 2 ·H...

Embodiment 2

[0039] As in the steps of Example 1, the difference is that Example 2 prepares CaTiO 3 / Cu / TiO 2 When composite photocatalyst, Cu(CH 3 COO) 2 ·H 2 The mass of O was changed from 20mg to 10mg, resulting in CaTiO 3 / Cu / TiO 2 Composite photocatalyst, the product quality is 30mg. The hydrogen production rate of the catalyst is 17.038mmol g -1 h -1 .

Embodiment 3

[0041] As in the steps of Example 1, the difference is that Example 3 prepares CaTiO 3 / Cu / TiO 2 When composite photocatalyst, Cu(CH 3 COO) 2 ·H 2 The mass of O was changed from 20 mg to 30 mg to obtain CaTiO 3 / Cu / TiO 2 Composite photocatalyst, the product quality is 30mg. The hydrogen production rate of the catalyst is 17.926mmol g -1 h -1 .

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Abstract

The invention discloses an all-solid-state vector Z mechanism composite photocatalyst CaTiO3 / Cu / TiO2, a preparation method and application of the all-solid-state vector Z mechanism composite photocatalyst CaTiO3 / Cu / TiO2 in photocatalytic hydrogen production, and belongs to the field of energy storage and conversion materials. The composite photocatalyst is constructed by utilizing a two-step hydrothermal method, the main absorption range of the composite photocatalyst is expanded to 378 nm compared with 355 nm of pure CaTiO3, and the color of the composite material is darkened along with loading of Cu, so that the composite photocatalyst also has weak absorption (lambda is less than 595 nm). An electron transfer medium Cu is introduced into the CaTiO3 / TiO2 heterojunction material to form a vector Z mechanism system, transfer of photo-generated charges and separation of photo-excited carriers can be effectively promoted, the recombination efficiency is reduced, and therefore the photocatalytic hydrogen production performance is improved. In addition, the composite photocatalyst CaTiO3 / Cu / TiO2 can also be made into an electrode material, and has good photoelectric response under the irradiation of ultraviolet visible light.

Description

technical field [0001] The invention belongs to the field of energy storage and conversion materials, in particular to an all-solid-state vector Z mechanism composite photocatalyst CaTiO 3 / Cu / TiO 2 , preparation method and its application in photocatalytic hydrogen production. Background technique [0002] At present, the energy crisis and environmental pollution have become obstacles to the sustainable development of countries all over the world. In order to cope with the increasingly serious energy crisis and environmental pollution problems, clean energy is widely used today, such as solar energy, wind energy, hydrogen energy, geothermal energy, water energy, nuclear energy and so on. Among them, hydrogen energy is a clean energy that will play an important role in the world's energy landscape and help reduce carbon emissions in transportation and industry. However, about 5% of the hydrogen used today is produced by electrolysis of water, with most of the rest coming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/00B01J35/10B01J37/10C01B3/04
CPCB01J23/78B01J37/10C01B3/042B01J35/33B01J35/39B01J35/651B01J35/647Y02E60/36
Inventor 尹升燕杨俊锋董妍惠李大光孙航秦伟平
Owner JILIN UNIV
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