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High-performance photoelectric chemical water decomposition photoanode based on BiFeO3 ferroelectric effect, and preparation method thereof

A ferroelectric effect, high-performance technology, applied in the field of high-performance photoelectrochemical decomposition of water photoanode and its preparation, can solve the problems of wide bandwidth and low photoelectric conversion efficiency, achieve simple structure, improve photoelectrochemical performance, and good application prospects Effect

Inactive Publication Date: 2019-03-15
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to TiO 2 The material itself has a large bandwidth and a small absorption band for solar energy, making the photoelectric conversion efficiency low (when the bandwidth is greater than 3.0eV, the photoelectric conversion efficiency is less than 2%)

Method used

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  • High-performance photoelectric chemical water decomposition photoanode based on BiFeO3 ferroelectric effect, and preparation method thereof
  • High-performance photoelectric chemical water decomposition photoanode based on BiFeO3 ferroelectric effect, and preparation method thereof
  • High-performance photoelectric chemical water decomposition photoanode based on BiFeO3 ferroelectric effect, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: TiO 2 Film thickness 30nm, BiFeO 3 The thickness of the film is 30nm, and it is used as a photoanode after packaging, a saturated calomel electrode as a reference electrode, a Pt sheet as a counter electrode, and an electrolyte solution of 1M NaOH aqueous solution. Depend on figure 1 It can be seen that compared with pure TiO 2 ,TiO 2 / 30nmBiFeO 3 The light absorption performance of the composite photoanode in the visible region is significantly enhanced. Depend on figure 2 and image 3 It can be seen that the photocurrent density under visible light and AM1.5G increases significantly.

Embodiment 2

[0019] Example 2: TiO 2 Film thickness 30nm, BiFeO 3 The thickness of the film is 50nm, and it is used as a photoanode after packaging, a saturated calomel electrode as a reference electrode, a Pt sheet as a counter electrode, and an electrolyte solution of 1M NaOH aqueous solution. The ferroelectric polarization effect is achieved by applying a forward and reverse voltage of 5V. Forwardly polarized BiFeO 3 The film is connected to the positive pole of the power supply, FTO is connected to the negative pole of the power supply, and BiFeO is used for reverse polarization 3 The film is connected to the negative pole of the power supply, and the FTO is connected to the positive pole of the power supply. Depend on figure 1 It can be seen that compared with pure TiO 2 ,TiO 2 / 50nmBiFeO 3 The light absorption performance of the composite photoanode in the visible region is significantly enhanced. At the same time, by figure 2 and image 3 It can be seen that the photocurr...

Embodiment 3

[0020] Example 3: TiO 2 Film thickness 30nm, BiFeO 3The thickness of the film is 80nm, and it is used as a photoanode after packaging, a saturated calomel electrode as a reference electrode, a Pt sheet as a counter electrode, and an electrolyte solution of 1M NaOH aqueous solution. Depend on figure 1 It can be seen that compared with pure TiO 2 ,TiO 2 / 80nmBiFeO 3 The light absorption performance of the composite photoanode in the visible region is significantly enhanced. At the same time, by figure 2 and image 3 It can be seen that the photocurrent density under visible light and AM1.5G has increased.

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Abstract

The invention relates to a high-performance photoelectric chemical water decomposition photoanode based on a BiFeO3 ferroelectric effect, and a preparation method thereof. According to the method provided by the invention, FTO is used as a substrate for preparing a TiO2 thin film, and a BiFeO3 thin film is composited on the TiO2 thin film; ferroelectric polarization is executed for the BiFeO3 thinfilm through application of forward and backward voltage, and semiconductor performance of the TiO2 and ferroelectric characteristics of the FeO3 are combined together. With the photoanode and the method provided by the invention, response capability of a composite photoanode to visible light is realized, and photoelectric chemical performance of the photoanode is improved. Through the own ferroelectric effect of the BiFeO3 thin film, a built-in electric field of the BiFeO3 thin film is changed, consequently, an energy band structure of an interface is regulated effectively, carriers are separated effectively, and the photoelectric chemical performance of the photoanode is improved. The photoanode provided by the invention is simple in structure and easy to produce in large scale, and hasbetter application foreground.

Description

technical field [0001] The invention belongs to the technical field of clean and renewable new energy utilization, and relates to a BiFeO-based 3 High-performance photoelectrochemical water splitting photoanode with ferroelectric effect and its preparation method. Background technique [0002] In the context of the current increasingly prominent energy and environmental issues, people are paying more and more attention to finding clean and sustainable new energy sources to replace traditional fossil energy sources. Solar energy is an inexhaustible energy source that is ecologically pure and does not change the fuel balance on the earth. As long as 0.1% of solar energy reaching the earth's surface can be converted with 10% efficiency, the global energy demand can be met. Therefore, solar energy is the most ideal energy source for human society to build a low-carbon economy in the future, and the development of efficient solar energy utilization methods has become a major res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01G9/042
CPCH01G9/2031H01G9/2036Y02E10/542Y02P70/50
Inventor 李红霞席俊华季振国
Owner HANGZHOU DIANZI UNIV
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