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Cu2O/C3N4/TiO2 heterojunction visible light catalyst and preparation method thereof

A C3N4, heterojunction technology, used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems affecting the photoelectric catalytic performance of Cu2O, the low efficiency of photogenerated carrier collection, and carrier diffusion. The problem of unfavorable length ratio and other problems can achieve the effect of direct and fast electron transport channel, reducing electron-hole recombination rate and good photoelectric catalytic performance.

Pending Publication Date: 2020-10-30
杭州紫芯光电有限公司
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AI Technical Summary

Problems solved by technology

[0005] Although Cu 2 O possesses favorable energetic sites for water splitting, but two major challenges hinder its application as an efficient and durable photocathode for water splitting.
The first issue is stability, since the redox potential of monovalent copper oxide reduction and oxidation is within the water-splitting potential, making the photocorrosion of the material more favorable than the water-splitting reaction in the electrolyte.
The second problem is the unfavorable ratio of carrier diffusion length to light absorption depth
However, the minority carrier (electron) diffusion length is limited to about 200 nm or less depending on the synthesis method
This leads to inefficient collection of photogenerated carriers, which seriously affects the Cu 2 O photocatalytic performance

Method used

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  • Cu2O/C3N4/TiO2 heterojunction visible light catalyst and preparation method thereof
  • Cu2O/C3N4/TiO2 heterojunction visible light catalyst and preparation method thereof
  • Cu2O/C3N4/TiO2 heterojunction visible light catalyst and preparation method thereof

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Embodiment 1

[0036] The invention provides a Cu 2 O / C 3 N 4 / TiO 2 Preparation method of heterojunction visible light catalyst.

[0037] a Cu 2 O / C 3 N 4 / TiO 2 A method for preparing a heterojunction visible light catalyst, comprising the following steps:

[0038] Step 1: Cut the FTO glass as the substrate into 1x2cm, put it in acetone and ultrasonically clean it for 20 minutes, and then put it in an oven to dry for later use;

[0039] Step 2: Sputter 2um copper on the surface of FTO by sputtering, use electrochemical workstation, adopt constant current mode, use FTO / Cu as working electrode, mercury oxide as reference electrode, platinum sheet as counter electrode, 3mol NaOH For the electrolyte, electroplating is prepared as figure 1 Shown Cu(OH) 2 Nano-array, wherein, the electroplating current is 3mA-20mA, electroplating 2-30min;

[0040] Step 3: Put the prepared Cu(OH) 2 The nanoarrays were placed in a tube furnace for annealing treatment, the annealing treatment temperatur...

Embodiment 2

[0048] a Cu 2 O / C 3 N 4 / TiO 2 The heterojunction visible light catalyst is prepared by the above method.

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Abstract

The invention relates to a preparation method of a visible light catalyst Cu2O / C3N4 / TiO2 heterojunction visible light catalyst, comprising the following steps of: sputtering a layer of Cu on the surface of FTO glass, obtaining a Cu (OH) 2 nano array by an electroplating oxidation method, and carrying out annealing treatment to obtain a Cu2O nano array; compounding C3N4 and Cu2O nano arrays througha centrifugal compounding method; and finally, sputtering a layer of TiO2 to form a multi-stage heterojunction, so that separation and transmission of interlayer electron holes are promoted, and thecatalytic performance of the photocatalyst and the stability of an electrode material are further improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, in particular to a Cu 2 O / C 3 N 4 / TiO 2 Heterojunction visible light catalyst and preparation method thereof. Background technique [0002] With the continuous increase of global population density and the rapid development of society, the human demand for energy is also increasing. At the same time, fossil energy sources such as coal, oil, and natural gas are becoming increasingly exhausted. Finding new energy sources to replace traditional fossil energy sources and changing the existing energy structure has become a major challenge for mankind in the 21st century. In addition, with the excessive use of fossil energy, the greenhouse effect caused by a large amount of carbon dioxide emissions is destroying the ecological environment on which we live. Therefore, the eyes of the whole world are focused on finding new, low-carbon and environmentally friendly sustainable, renewable and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/34B01J35/10B82Y30/00B82Y40/00C01B3/04C25B11/06C25B1/04
CPCB01J27/24B01J37/348B82Y30/00B82Y40/00C01B3/042C25B1/04B01J35/33B01J35/61B01J35/39Y02E60/36
Inventor 程琳王顺利郑海红陈冠政
Owner 杭州紫芯光电有限公司
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