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ferroelectric composite cu 2 oVisible light photolysis of water to produce hydrogen photocathode and its preparation method

A technology of photolysis of water to produce hydrogen and visible light, which is applied in the field of photoelectrochemistry, can solve the problems of poor photocathode stability, photogenerated carrier separation and low transport efficiency, and achieve improved stability, improved life, and improved stability. Effect

Active Publication Date: 2019-11-08
SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0007] The object of the invention is to provide ferroelectric composite Cu 2 O visible light photolysis of water to produce hydrogen 2 O Common defects of poor photocathode stability, photogenerated carrier separation and low transport efficiency

Method used

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  • ferroelectric composite cu <sub>2</sub> oVisible light photolysis of water to produce hydrogen photocathode and its preparation method
  • ferroelectric composite cu <sub>2</sub> oVisible light photolysis of water to produce hydrogen photocathode and its preparation method
  • ferroelectric composite cu <sub>2</sub> oVisible light photolysis of water to produce hydrogen photocathode and its preparation method

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preparation example Construction

[0051] Ferroelectric Composite Cu 2 A preparation method of a photocathode for producing hydrogen by visible light photolysis of water, comprising the following steps:

[0052] Step 1. Place the silicon wafer substrate 1 on the deposition table in the vacuum chamber of the magnetron sputtering apparatus, with the Pt side of the silicon wafer substrate 1 facing up, and the air pressure in the vacuum chamber is 1×10 -4 -3×10 -4 Pa;

[0053] Step 2: Introduce a mixed gas of oxygen and argon with a volume ratio of 1:5-1:6 into the vacuum chamber of step 1, and control the air pressure in the vacuum chamber at 0.75-1Pa;

[0054] Step 3. Adjust the heating power of the magnetron sputtering apparatus to keep the temperature of the deposition table stable at 250-300°C;

[0055] Step 4, adjust the sputtering power of the magnetron sputtering apparatus to 30-40W, and deposit Cu on the Pt surface of the silicon wafer substrate 1 2 O thin film layer 2, the deposition time is 20-30min;...

Embodiment 1

[0069] Such as figure 1 As shown, p-type Cu with a thickness of 300 nm was deposited on the Pt surface of the silicon wafer substrate 1 2 O thin film layer 2, silicon wafer substrate 1 is Pt / Ti / SiO 2 / Si(100); followed by Cu 2A thin gold film layer is deposited on the upper surface of the O film layer 2, and the gold nanorod particle layer 3 is obtained after annealing in the muffle furnace. , gold nanorod particles with a diameter of 10-15nm; finally, in the Cu with gold nanorod particle layer 3 2 A layer of n-type BiFeO with a thickness of 300 nm was deposited on the surface of the O thin film layer 2 3 Ferroelectric thin film layer 4, formed by Cu 2 O / Au / BiFeO 3 photocathode.

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Abstract

The invention relates to a ferroelectric composite Cu2O visible light water photolysis hydrogen production photocathode and a preparing method thereof. The photocathode is sequentially composed of a BiFeO3 ferroelectric film layer, a gold nano-rod granular layer, a Cu2O film layer and a silicon wafer substrate from top to bottom, and heterojunctions are formed between the Cu2O film layer and the BiFeO3 ferroelectric film layer. According to the ferroelectric composite Cu2O visible light water photolysis hydrogen production photocathode and the preparing method of the photocathode, adverse effects of energy band barriers between the Cu2O film layer and the BiFeO3 ferroelectric film layer are eliminated through gold nano-rod granules by means of the LSPR effect, absorption of visible light with the wave length ranging from 650 nm-750 nm is strengthened, the Cu2O film layer is protected by the BiFeO3 ferroelectric film layer, residual polarization electric fields are used for eliminatingupwarp barriers on photoelectrode / electrolyte interfaces, the water photolysis efficiency and the hydrogen production efficiency are improved, the light current density reaches 91 microampere / cm<2>, and the threshold voltage relative to a reversible hydrogen electrode reaches 1.01 V.

Description

technical field [0001] The invention relates to the field of photoelectrochemical technology, in particular to ferroelectric composite Cu 2 O visible light photolysis of water hydrogen production photocathode and its preparation method. Background technique [0002] Hydrogen production through photoelectrochemical cell absorption and utilization of solar energy for photolysis of water is a promising renewable energy technology. Semiconductor photoelectrodes with high hydrogen production efficiency and stability are the most important components of photoelectrochemical cells. [0003] Semiconductor photoelectrodes are divided into photoanodes that generate oxygen and photocathode that generate hydrogen. At present, the common photocathodes are mainly realized by p-type semiconductors, and the number is small. As a common photocathode material, Cu 2 O has the characteristics of p-type conductivity, absorption and utilization of visible light, and an energy band structure s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/04C25B1/04C23C14/08C23C14/18C23C14/35
CPCC23C14/08C23C14/087C23C14/185C23C14/352C25B1/04C25B1/55C25B11/091Y02E60/36
Inventor 程小荣古寿林刘昊吴阳江张明玉
Owner SUZHOU TAIHU ELECTRIC ADVANCED MATERIAL CO LTD
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