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Boron-doped carbon nitride modified titanium dioxide composite photoelectrode and preparing method and application of boron doping carbon nitride modified titanium dioxide composite photoelectrode

A technology of titanium dioxide and carbon nitride, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve problems such as field barriers, wide band gaps, and low separation efficiency of electrons and holes, so as to suppress recombination, broaden the absorption range, and improve The effect of photocatalytic efficiency

Inactive Publication Date: 2017-09-05
HUANGHE S & T COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 There are still obstacles in the field of photocatalytic water splitting. On the one hand, TiO 2 The band gap is wide, and its light absorption range is mainly concentrated in the ultraviolet region, and the utilization rate of visible light is extremely low; on the other hand, the separation efficiency of electrons and holes is low, and the utilization rate of carriers is low.

Method used

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  • Boron-doped carbon nitride modified titanium dioxide composite photoelectrode and preparing method and application of boron doping carbon nitride modified titanium dioxide composite photoelectrode

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Effect test

Embodiment 1

[0024] A preparation method of boron-doped carbon nitride modified titanium dioxide composite photoelectrode, comprising the following steps:

[0025] (1) Add a titanium source compound to hydrochloric acid with a mass fraction of 18.5%, and stir at room temperature until the solution is clear to obtain a mixed solution; the titanium source compound is isopropyl titanate, and the volume ratio of hydrochloric acid to titanium source compound is 3 : 0.07;

[0026] (2) Transfer the mixture obtained in step (1) to a reaction kettle lined with tetrafluoroethylene, and place the FTO conductive glass with the conductive side facing down in the reaction kettle, raise the temperature to 150°C, perform hydrothermal reaction for 12 hours, and cool to room temperature; then take out the conductive glass, wash it with deionized water, dry it with high-purity nitrogen, then put it into the muffle furnace, raise the temperature to 450°C at a heating rate of 5°C / min, and calcined it for 2 hou...

Embodiment 2

[0029] A preparation method of boron-doped carbon nitride modified titanium dioxide composite photoelectrode, comprising the following steps:

[0030](1) Add a titanium source compound to hydrochloric acid with a mass fraction of 15%, and stir at room temperature until the solution is clear to obtain a mixed solution; the titanium source compound is isopropyl titanate, and the volume ratio of hydrochloric acid to titanium source compound is 3 : 0.06;

[0031] (2) Transfer the mixture obtained in step (1) to a reaction kettle lined with tetrafluoroethylene, and place the FTO conductive glass with the conductive side facing down in the reaction kettle, raise the temperature to 140°C, perform a hydrothermal reaction for 15 hours, and cool to room temperature; then take out the conductive glass, wash it with deionized water, dry it with high-purity nitrogen, and then put it into the muffle furnace, raise the temperature to 440°C at a heating rate of 3°C / min, and calcined it for 3 ...

Embodiment 3

[0034] A preparation method of boron-doped carbon nitride modified titanium dioxide composite photoelectrode, comprising the following steps:

[0035] (1) Add a titanium source compound to hydrochloric acid with a mass fraction of 20%, and stir at room temperature until the solution is clear to obtain a mixed solution; the titanium source compound is n-butyl titanate, and the volume ratio of hydrochloric acid to titanium source compound is 3 : 0.07;

[0036] (2) Transfer the mixed liquid obtained in step (1) to a reaction kettle lined with tetrafluoroethylene, and place the FTO conductive glass with the conductive side down in the reaction kettle, raise the temperature to 160°C, conduct a hydrothermal reaction for 8 hours, and cool to room temperature; then take out the conductive glass, wash it with deionized water, dry it with high-purity nitrogen, and then put it into the muffle furnace, raise the temperature to 460°C at a heating rate of 6°C / min, and calcined it for 2 hour...

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Abstract

The invention discloses a preparing method of a boron-doped carbon nitride modified titanium dioxide composite photoelectrode. The preparing method includes the following steps that a titanium source compound is added into hydrochloric acid dropwise, then conducting glass is inserted into a mixture for a hydrothermal reaction, then the conducting glass is taken out to be washed, dried, calcined and cooled to room temperature, and a TiO2 photo-anode is obtained; urea and boric acid are dissolved into deionized water to form modification liquid, the TiO2 photo-anode is steeped into the modification liquid to be died, calcined and cooled to room temperature, and the boron doping carbon nitride modified titanium dioxide composite photoelectrode is obtained. According to the preparing method, TiO2 grows to the surface of an FTO conducting glass material, then the surface of a semiconductor material is modified with boron-doped g-C3N4, an even modification layer is formed, the spectral absorption scope can be enlarged, the light capture rate is increased, photogenerated charge separation can be effectively promoted, and finally the photoelectrocatalysis water decomposition efficiency of the composite electrode is finally improved.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a boron-doped carbon nitride-modified titanium dioxide composite photoelectrode, a preparation method thereof, and an application in photoelectric catalytic water decomposition. Background technique [0002] The excessive development and use of traditional energy sources such as coal mines, oil, and natural gas by humans not only consumes limited fossil energy but also causes serious environmental pollution. With the development of society, the world's environmental pollution is becoming more and more serious, and the energy crisis is intensifying. Countries around the world have listed the development and utilization of renewable energy industries as an important strategic goal of the country. Hydrogen energy is a clean and green energy, and the only product of its combustion is water; on the other hand, solar energy is abundant, not subject to geogra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06C23C18/12
CPCC23C18/1216C25B1/04C25B1/55C25B11/091Y02E60/36
Inventor 孔维倩张晓凡张守仁
Owner HUANGHE S & T COLLEGE
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