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Method for producing hydrogen by photoelectrocatalytic decomposition of water

A photoelectric catalysis and water splitting technology, applied in the direction of electrolysis process, electrolysis components, electrodes, etc., to achieve the effect of not harsh process conditions, wide preparation window and simple preparation process

Active Publication Date: 2021-07-02
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although Se solar cells have been studied for a long time, there are no reports on the photoelectrochemical (PEC) water splitting of Se-based thin-film materials for hydrogen production.

Method used

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  • Method for producing hydrogen by photoelectrocatalytic decomposition of water
  • Method for producing hydrogen by photoelectrocatalytic decomposition of water
  • Method for producing hydrogen by photoelectrocatalytic decomposition of water

Examples

Experimental program
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Embodiment 1

[0021] Divide 2.5×2.5cm 2 The FTO glass was ultrasonically cleaned with ethanol, acetone, and ultrapure water for 30 min respectively, and dried with nitrogen to obtain a cleaned FTO glass sheet; Se thin film, the vacuum degree of the controlled thermal evaporation system chamber is 5×10 -3 Pa; and then performing rapid thermal annealing treatment on the deposited Se thin film, the temperature of the rapid annealing treatment is 180° C., and the time is 5 minutes to obtain the Se / FTO photocathode. The crystallinity of the Se thin film on the photocathode is as follows figure 1 shown. In the figure, the XRD diffraction peaks of 2θ at 23.1°, 29.4°, and 41.7° correspond to the (100), (101), and (110) crystal orientations of Se respectively, indicating that gray-black t-Se (triangular structure-Se ).

[0022] The prepared Se / FTO photocathode was used as the working electrode, with 0.5mol / LH 2 SO 4The aqueous solution is the electrolyte solution, the saturated calomel electro...

Embodiment 2

[0024] In this example, the Se / FTO photocathode is first prepared according to the method of Example 1, and then a layer of TiO with a thickness of 25 nm is deposited on the surface of the Se film of the Se / FTO photocathode by atomic layer deposition. 2 Thin film, the chamber substrate temperature is 120°C, and the preparation cycle is 4 cycles to obtain TiO 2 / Se / FTO photocathode. The prepared TiO 2 / Se / FTO photocathode as working electrode, with 0.5mol / L H 2 SO 4 The aqueous solution is the electrolyte, and the saturated calomel electrode and the platinum sheet are used as the reference electrode and the counter electrode respectively, and the simulated sunlight composed of a 300W xenon lamp and an AM 1.5G filter is used as the light source at a light intensity of 100mW / cm 2 The photocathode activity (LSV) test of continuous chopping light is carried out, and the test pattern is as follows image 3 shown. The results show that at 25nm TiO 2 The coated Se electrode is a...

Embodiment 3

[0026] In the present embodiment, first prepare TiO according to the method of embodiment 2 2 / Se / FTO photocathode followed by TiO 2 TiO / Se / FTO photocathode 2 The surface of the film was again sputtered with Pt as a hydrogen catalyst by means of magnetron sputtering, and the vacuum degree of the system was 5×10 - 3 Pa, sputtering power is 40W, sputtering time is 6s, get Pt / TiO 2 / Se / FTO photocathode. The prepared Pt / TiO 2 / Se / FTO photocathode as working electrode, with 0.5mol / LH 2 SO 4 The aqueous solution is the electrolyte, and the saturated calomel electrode and the platinum sheet are used as the reference electrode and the counter electrode respectively, and the simulated sunlight composed of a xenon lamp with a light source of 300W and an AM 1.5G filter is used at a light intensity of 100mW / cm 2 The photocathode activity (LSV) test under continuous chopping light, the test results are as follows Figure 4 shown. The results show that in TiO 2 The surface is furt...

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Abstract

The invention discloses a method for producing hydrogen by photoelectrocatalytic decomposition of water, which comprises the following steps of: firstly, a layer of Se film on FTO (Fluorine-doped Tin Oxide) glass is deposited by utilizing a thermal evaporation method, and then by carrying out rapid thermal annealing treatment on the deposited Se film, obtain a Se / FTO photocathode is obtained; a layer of TiO2 thin film is prepared on the surface of the Se thin film through an atomic layer deposition method to obtain a TiO2 / Se / FTO photocathode; a co-hydrogen catalyst Pt is supported on the surface of the TiO2 thin film through a magnetron sputtering method, and a Pt / TiO2 / Se / FTO photocathode is obtained; the obtained three Se-based photocathodes are used as working electrodes, an H2SO4 aqueous solution is used as an electrolyte, hydrogen production by photoelectrocatalytic decomposition of water is carried out under illumination and external bias voltage, the three photoelectrodes all have excellent photocathode current response, the photocurrent density of the Pt / TiO2 / Se / FTO photocathode can reach about 8mA / cm < 2 > when VRHE is 0V, and the maximum photocurrent density can reach about 16mA / cm < 2 > when VRHE is-0.5 V. The Pt / TiO2 / Se / FTO photocathode in unit area per hour can generate 0.3 mmol of hydrogen on average.

Description

technical field [0001] The invention belongs to the technical field of photoelectrocatalytic decomposition of water to produce hydrogen, and in particular relates to a method for photocatalytically decomposing water to produce hydrogen by a novel Se-based photocathode device. Background technique [0002] In recent years, with the rapid development of the global economy and society, the demand and utilization of energy by human beings has been increasing, and the global energy demand has risen sharply. Human beings urgently need to explore and develop some new renewable energy sources to solve the current energy crisis. Among them, photoelectrochemical hydrogen production from solar energy and water provides a clean and sustainable fuel option for the future. Photocatalytic water splitting offers a promising approach to convert solar energy into clean and sustainable hydrogen energy. The photocathode material used for photocatalytic water splitting is an important part of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B1/55C25B11/052C25B11/081C23C14/18C23C14/35C23C14/58C23C16/40C23C16/455C23C28/00
CPCC25B1/04C23C14/18C23C14/5806C23C16/405C23C16/45525C23C14/35C23C14/185C23C28/322C23C28/3455Y02E60/36
Inventor 高斐李佳辉李登刘生忠华晓冬张超群李元瑞石伯男
Owner SHAANXI NORMAL UNIV
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