Titanium dioxide photoelectrode co-modified by carbon dots and carbon nitride, as well as preparation method and application thereof

A technology of titanium dioxide and photoelectrode, which is applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of low utilization rate of visible light, application hindrance, and low utilization rate of carriers, so as to improve photocatalytic efficiency and reduce serious charge recombination , the effect of improving conductivity

Inactive Publication Date: 2018-12-18
HUANGHE S & T COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to TiO 2 The band gap is relatively wide, and it can only absorb ultraviolet light, and the utilization rate of visible light is extremely low.
Moreover, TiO 2 The problem of electron-hole recombination is relatively serious, resulting in a low utilization rate of carriers
Therefore, TiO 2 The application in the field of photocatalysis is still hindered to some extent

Method used

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  • Titanium dioxide photoelectrode co-modified by carbon dots and carbon nitride, as well as preparation method and application thereof
  • Titanium dioxide photoelectrode co-modified by carbon dots and carbon nitride, as well as preparation method and application thereof
  • Titanium dioxide photoelectrode co-modified by carbon dots and carbon nitride, as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0024] A method for preparing a carbon dot and carbon nitride co-modified titanium dioxide photoelectrode, comprising the following steps:

[0025] (1) Preparation of titania photoelectrode

[0026] Add isopropyl titanate to a hydrochloric acid solution with a mass fraction of 18.7% (the volume ratio of hydrochloric acid solution to isopropyl titanate is 3:0.06), stir until the mixed solution becomes clear, and then transfer the mixed solution to a polytetrafluoroethylene In the ethylene-lined reactor, place the cleaned FTO conductive glass with the conductive side down in the reactor, put the reactor in an oven at 150°C for 12 hours, then cool it down to room temperature naturally, and heat the water after the reaction The conductive glass is taken out and washed with deionized water, and the high-purity N 2 Blow it dry, then put it into a muffle furnace and raise the temperature to 550°C at a rate of 5°C / min for 3 h, then cool it down to room temperature naturally to obtain...

Embodiment 2

[0042] A method for preparing a carbon dot and carbon nitride co-modified titanium dioxide photoelectrode, comprising the following steps:

[0043] (1) Preparation of titania photoelectrode

[0044] Add n-butyl titanate to 15% hydrochloric acid solution (the volume ratio of hydrochloric acid solution and n-butyl titanate is 3:0.04), stir until the mixed solution becomes clear, and then transfer the mixed solution to polytetrafluoroethylene In the ethylene-lined reactor, place the cleaned FTO conductive glass with the conductive side down in the reactor, put the reactor in an oven at 130°C for 24 hours, and then cool it down to room temperature naturally. After the hydrothermal reaction The conductive glass is taken out and washed with deionized water, and the high-purity N 2 Blow it dry, then put it into a muffle furnace to raise the temperature to 500°C at a rate of 3°C / min for 3.5 hours, and cool it down to room temperature naturally to obtain a titanium dioxide photoelectr...

Embodiment 3

[0050] A method for preparing a carbon dot and carbon nitride co-modified titanium dioxide photoelectrode, comprising the following steps:

[0051] (1) Preparation of titania photoelectrode

[0052] Add isopropyl titanate to 20% hydrochloric acid solution (the volume ratio of hydrochloric acid solution and isopropyl titanate is 3:0.07), stir until the mixed solution becomes clear, and then transfer the mixed solution to polytetrafluoroethylene In the ethylene-lined reactor, place the cleaned FTO conductive glass with the conductive side down in the reactor, put the reactor in an oven at 170°C for 8 hours, and then cool it down to room temperature naturally. After the hydrothermal reaction The conductive glass is taken out and washed with deionized water, and the high-purity N 2 Blow it dry, then put it into a muffle furnace to raise the temperature to 600°C at a rate of 7°C / min for 2.5 hours, and cool it down to room temperature naturally to obtain a titanium dioxide photoele...

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Abstract

The invention discloses a preparation method for a titanium dioxide photoelectrode co-modified by carbon dots and carbon nitride, and an application thereof in photoelectrocatalytic decomposition forwater. The preparation method for the titanium dioxide photoelectrode co-modified by the carbon dots and carbon nitride comprises the following steps: (1) preparing TiO2 nanorods on FTO conductive glass through a hydrothermal reaction, and obtaining the titanium dioxide photoelectrode through calcining; (2) soaking the titanium dioxide photoelectrode into a urea aqueous solution, soaking for 10-30minutes, drying, and calcining to obtain a C3N4/TiO2 photoelectrode; and (3) spinning-coating the C3N4/TiO2 photoelectrode with a carbon dot solution, and drying to obtain a CDs/C3N4/TiO2 composite photoelectrode. According to the preparation method and the application, C3N4 is modified onto the surface (C3N4/TiO2) of TiO2 to form a uniform catalytic layer at first, and then prepared carbon dotsare modified onto the surface of the C3N4/TiO2 composite photoelectrode, so that the electrical conductivity of the composite photoelectrode can be effectively improved, and the problem of serious surface charge recombination of TiO2 is reduced; and meanwhile, expansion for the spectral absorption range of TiO2 and increasing for the separation efficiency of charge carriers are realized, so that the photoelectrocatalytic efficiency for TiO2 is increased.

Description

technical field [0001] The invention belongs to the technical field of photoelectric materials, and in particular relates to a preparation method of carbon dots and carbon nitride co-modified titanium dioxide photoelectrode and its application in photoelectric catalytic water decomposition. Background technique [0002] In the current society, the rate of exploitation and consumption of traditional non-renewable energy sources such as oil, coal, and natural gas is increasing rapidly. The problems of environmental pollution and energy crisis caused by the energy consumed in this process are also becoming more and more severe. Therefore, the development and utilization of renewable and clean energy has attracted more and more attention. Solar energy is a green, clean and renewable resource with huge reserves. People have begun to study how to use solar energy more efficiently. Among the many ways to develop and utilize solar energy, using sunlight to catalyze the decompositi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06
CPCC25B1/04C25B1/55C25B11/091Y02E60/36
Inventor 孔维倩张晓凡吴东海张守仁杨保成郭峥
Owner HUANGHE S & T COLLEGE
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