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Preparation method for CQDs/GCNNs/Fe(2-x)TixO3/FTO photo-anode

A fe2-xtixo3, photoanode technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of high overpotential, high energy consumption of photoelectric splitting water for hydrogen production, high activation energy, improve efficiency and solve the problem of reaction kinetics , the effect of low energy consumption

Active Publication Date: 2018-06-22
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As we all know, the water splitting reaction is composed of two half-reactions of hydrogen production and oxygen production by splitting water. After years of research by scientists from all over the world, it is found that the chemical reaction of water splitting is facing a kinetic problem, that is, splitting water to produce oxygen is the speed control that determines the reaction. step; the activation energy required for the reaction in this step is high, the overpotential required for the photoelectrochemical water splitting reaction is high, and the photocurrent density generated is low, which leads to the problem of high energy consumption in photoelectric splitting water to produce hydrogen

Method used

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  • Preparation method for CQDs/GCNNs/Fe(2-x)TixO3/FTO photo-anode

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Experimental program
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Embodiment 1

[0029] (1) prepare 0.1 mole of ferric chloride (purity ≥ 99.0%) aqueous solution and 0.15 mole of urea (purity ≥ 99.5%) aqueous solution;

[0030] (2) Take 0.2 milliliters of titanium tetrachloride (purity ≥ 99.5%) solution, add 20 milliliters of absolute ethanol (ethanol content ≥ 99.5%) to it, stir and mix evenly;

[0031] (3) Take out 180 microliters of solution from step (2), add the solution prepared in step (1), and stir for 30 minutes;

[0032](4) Put the FTO sheet cut to a certain area into water for 20 minutes, then put it into ethanol for 20 minutes, then put it into acetone solvent for 30 minutes, and finally dry it with high-purity nitrogen. FTO film;

[0033] (5) Get 30 milliliters of the solution in the step (3) and add it to a 50 milliliter polytetrafluoroethylene reaction kettle with a stainless steel substrate, then put the FTO sheet cleaned in the step (4) into the above-mentioned reaction kettle , where the conductive surface of the FTO sheet is placed dow...

Embodiment 2

[0037] (1)~(7) are with embodiment 1;

[0038] (8) will pass through the Fe prepared in step (7) 2-x Ti x o 3 / FTO slices were placed in a crucible containing dicyandiamide, 2cm above the dicyandiamide, and then calcined at 530°C for 3 hours in an air atmosphere, and were taken out after cooling down to room temperature to obtain GCNNs / Fe 2-x Ti x o 3 / FTO photoanode; the photocurrent density is 2.75mA / cm at 1.23V voltage (relative to reversible hydrogen electrode) after photoelectrochemical test 2 .

Embodiment 3

[0040] (1)~(7) are with embodiment 1;

[0041] (8) Prepare a 0.08 mole aqueous solution of sucrose, followed by carbonization at 180°C for 5 hours to obtain a CQDs solution (12.5 mg / L);

[0042] (9) The CQDs liquid prepared in step (8) is uniformly coated on the Fe prepared in step (7) by a spin coating process. 2- x Ti x o 3 / FTO, that is, get CQDs / Fe 2-x Ti x o 3 / FTO photoanode; the photocurrent density is 2.49mA / cm at 1.23V voltage (relative to reversible hydrogen electrode) after photoelectrochemical test 2 .

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Abstract

The invention discloses a preparation method for a CQDs / GCNNs / Fe(2-x)TixO3 / FTO photo-anode. The preparation method comprises the steps that soluble trivalent molysite and urea are put in a hydrothermal environment with an organic titanium solution as a titanium source and FTO conducting glass as a carrier, so that Fe(2-x)TixO3 / FTO is prepared; and then, the Fe(2-x)TixO3 / FTO is treated through thetreatment method as specified, so that the CQDs / GCNNs / Fe(2-x)TixO3 / FTO photo-anode is obtained. The photoelectricity test indicates that after the prepared photo-anode is treated through the treatmentprocess, the photoelectric current density of CQDs / GCNNs / Fe(2-x)TixO3 / FTO is 3.38 mA / cm<2> at the voltage of 1.23 V relative to a reversible hydrogen electrode, the photoelectric current density of the Fe(2-x)TixO3 / FTO is 1.66 mA / cm<2> at the voltage of 1.23V relative to the reversible hydrogen electrode, and the photoelectric current density is increased by two times or more; and therefore, thephoto-anode and the treatment method thereof are one of advanced technologies through which water can be efficiently decomposed in a low-energy-consumption manner; the good industrial application prospect is achieved; and the preparation method can be used for easing the current situation that energy supply is getting tense day by day globally.

Description

technical field [0001] The invention relates to the technical field of preparation of photoelectric electrode materials, in particular to a CQDs / GCNNs / Fe 2-x Ti x o 3 / FTO photoanode preparation method. Background technique [0002] In recent years, with the rapid development of my country's economy, the demand for energy is very strong, so these energy sources mainly come from non-renewable energy sources such as fossil fuels, coal, oil, natural gas, etc. The excessive use of these fossil fuels aggravates air pollution and global warming . Therefore, the development of clean, renewable alternatives to fossil fuels is an urgent problem to be solved. Among many new energy strategies, hydrogen is recognized as the most ideal new energy. It not only has a high calorific value, is non-toxic and non-polluting, and has sustainable raw materials, so how to produce hydrogen with high efficiency and low energy consumption is a research field of common concern all over the world. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B1/55C25B11/051C25B11/095Y02E60/36
Inventor 鄢俊敏易莎莎李思佳乌兰巴日段焱鑫姚佳欣蒋青
Owner JILIN UNIV
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