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Composite material for photoelectrochemical water decomposition, preparation method and application thereof, and electrode

A technology of photoelectrochemistry and composite materials, which is applied in the field of composite materials and its preparation, can solve the problems of limiting the quantum efficiency of highly active catalysts and low total light absorption intensity, and achieve good photoelectric conversion efficiency, good hydrogen production rate, and extended absorption spectrum Effect

Active Publication Date: 2021-05-14
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite Ti 3 C 2 The absorption range of nanoparticles can be extended to the NIR region, but based on Ti 3 C 2 The devices can only be excited by ultraviolet (UV) or visible light from sunlight
Moreover, Ti 3 C 2 The total light absorption intensity is still low, which limits the Ti-based 3 C 2 The quantum efficiency of highly active catalysts

Method used

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  • Composite material for photoelectrochemical water decomposition, preparation method and application thereof, and electrode
  • Composite material for photoelectrochemical water decomposition, preparation method and application thereof, and electrode
  • Composite material for photoelectrochemical water decomposition, preparation method and application thereof, and electrode

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Effect test

Embodiment 1

[0032] This embodiment provides a composite material for photoelectrochemical water splitting, and its preparation method comprises the following steps:

[0033] S1, cetyltrimethylammonium bromide (CTAB), HAuCl 4 and Ti 3 C 2 -MXene nanosheets formulated into a solution and added NaBH 4 Mix and stir at a temperature of 30°C for 2 hours to obtain a seed solution for later use; wherein, in the seed solution, the concentration of hexadecyltrimethylammonium bromide is 0.1mol / L, HAuCl 4 The concentration is 1mmol / L, Ti 3 C 2 -The concentration of MXene nanosheets is 1mg / mL, NaBH 4 The concentration is 10mmol / L.

[0034] S2, cetyltrimethylammonium bromide and HAuCl 4 formulated as a solution and added AgNO 3 After mixing with HCl, add ascorbic acid for mixing to obtain a mixed solution; wherein, in the mixed solution, AgNO 3 The concentration of HCl is 10mmol / L, the concentration of HCl is 2mol / L, the concentration of ascorbic acid is 0.1mol / L, the concentration of cetyltri...

Embodiment 2

[0038] This embodiment provides a composite material for photoelectrochemical water splitting, and its preparation method comprises the following steps:

[0039] S1, cetyltrimethylammonium bromide (CTAB), HAuCl 4 and Ti 3 C 2 -MXene nanosheets formulated into a solution and added NaBH 4 Mix and stir for 2 hours at a temperature of 25°C to obtain a seed solution for later use; wherein, in the seed solution, the concentration of hexadecyltrimethylammonium bromide is 0.05mol / L, HAuCl 4 The concentration is 0.5mmol / L, Ti 3 C 2 -The concentration of MXene nanosheets is 0.5 mg / mL, NaBH 4 The concentration is 5mmol / L.

[0040] S2, cetyltrimethylammonium bromide and HAuCl 4 formulated as a solution and added AgNO 3 After mixing with HCl, add ascorbic acid for mixing to obtain a mixed solution; wherein, in the mixed solution, AgNO 3 The concentration of HCl is 5mmol / L, the concentration of HCl is 1mol / L, the concentration of ascorbic acid is 0.05mol / L, the concentration of cet...

Embodiment 3

[0044] This embodiment provides a composite material for photoelectrochemical water splitting, and its preparation method comprises the following steps:

[0045] S1, cetyltrimethylammonium bromide (CTAB), HAuCl 4 and Ti 3 C 2 -MXene nanosheets formulated into a solution and added NaBH 4 Mix and stir at a temperature of 35°C for 2 hours to obtain a seed solution for later use; wherein, in the seed solution, the concentration of cetyltrimethylammonium bromide is 0.15mol / L, HAuCl 4 The concentration is 1.5mmol / L, Ti 3 C 2 -The concentration of MXene nanosheets is 1.5mg / mL, NaBH 4 The concentration is 15mmol / L.

[0046] S2, cetyltrimethylammonium bromide and HAuCl 4 formulated as a solution and added AgNO 3 After mixing with HCl, add ascorbic acid for mixing to obtain a mixed solution; wherein, in the mixed solution, AgNO 3 The concentration of HCl is 15mmol / L, the concentration of HCl is 3mol / L, the concentration of ascorbic acid is 0.15mol / L, the concentration of hexade...

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Abstract

The invention is applicable to the technical field of photoelectricity, and provides a composite material for photoelectrochemical water decomposition, a preparation method and application thereof and an electrode. The composite material comprises Ti3C2-MXene nanosheets and gold nanorods grown on the Ti3C2-MXene nanosheets in situ. According to the invention, the gold nanorods are grown in situ on the two-dimensional Ti3C2 to form the composite material with a Schottky junction, so that the carrier mobility of the Ti3C2 can be improved, the absorption spectrum can be expanded, and the ultraviolet-visible-near infrared wide absorption spectrum can be realized. The photoelectrochemical water decomposition electrode prepared from the composite material can realize full-spectrum photoelectric response, has high photoelectric conversion efficiency and hydrogen production rate, is simple in manufacturing method, has good working stability, and shows a wide application prospect.

Description

technical field [0001] The invention belongs to the field of photoelectric technology, and in particular relates to a composite material for photoelectrochemical water splitting, a preparation method, an application and an electrode. Background technique [0002] With the development of the economy, finding clean and sustainable energy has been an important strategic need to reduce the excessive consumption of fossil fuels and alleviate environmental problems. As an inexhaustible renewable energy source, solar energy provides power for all life on earth, and is considered to be the most valuable energy source for development and utilization. Since 1972, scientists have directly used photoelectrochemical (PEC) and photocatalytic water splitting to convert solar energy into hydrogen and oxygen, two methods considered to be the most promising in renewable energy research. Most electrodes currently used for photoelectrochemical conversion are semiconductors with band gaps gener...

Claims

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Application Information

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IPC IPC(8): C25B1/04C25B1/55C25B11/091B22F9/24B82Y30/00B82Y40/00
CPCC25B1/04B22F9/24B82Y30/00B82Y40/00Y02P20/133Y02E60/36
Inventor 陈旭徐文史志锋李新建
Owner ZHENGZHOU UNIV
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