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Rhodium-doped strontium titanate ultrathin nano-layer covered bismuth vanadate photoanode, and preparation method and application thereof

A bismuth vanadate and photoanode technology, which is applied in the direction of electrodes, electrolytic components, energy input, etc., to achieve the effects of improving photoelectrochemical performance, reducing reaction energy barriers, and increasing reactive sites

Active Publication Date: 2019-05-03
西安睿电生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, most of the research reports are mainly on powder photocatalysts, and there are few researches on BiVO 4 / SrTiO 3 The system is used as a photoelectrode film to study as a photocatalytic oxygen production material in water

Method used

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  • Rhodium-doped strontium titanate ultrathin nano-layer covered bismuth vanadate photoanode, and preparation method and application thereof
  • Rhodium-doped strontium titanate ultrathin nano-layer covered bismuth vanadate photoanode, and preparation method and application thereof
  • Rhodium-doped strontium titanate ultrathin nano-layer covered bismuth vanadate photoanode, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Step 1. Deposit the BiOI precursor on the FTO surface by means of electrochemical deposition: the electrodeposition solution is composed of 100 milliliters of pH 1.2 containing Bi(NO 3 ) 3 Mix with NaI solution A and 45 ml of solution B containing p-benzoquinone. Electrodeposition adopts a three-electrode system, Pt is the counter electrode, Ag / AgCl is the reference electrode, blank FTO is used as the working electrode, and the deposition potential is deposited in steps of -0.3V and -0.1V to obtain a BiOI electrode;

[0026] Step 2, exchange with 0.2M vanadium acetylacetonate solution to obtain bismuth vanadate BiVO 4 electrode, hereafter denoted as BVO, the extra V 2 o 5 Remove with NaOH solution;

[0027] Step 3. BiVO 4 -Rh-SrTiO 3 Synthesis of photoanode:

[0028] Dissolve 0.5-1ml of tetrabutyl titanate in acetic acid, then add 2.5ml of deionized water, stir until the solution is transparent, then add 2.5ml of strontium nitrate and citric acid aqueous solution...

Embodiment 2

[0030] The difference from Example 1 is: Dissolve 0.5-1ml tetrabutyl titanate in acetic acid, add rhodium nitrate solution at a molar ratio of Ti:Rh=99:1, then add 2.5ml deionized water, and stir until the solution After it becomes transparent, add 2.5ml of strontium nitrate and citric acid aqueous solution respectively, then stir until the solution is transparent, and apply it on the prepared bismuth vanadate electrode by spin coating, and anneal at high temperature after drying to crystallize to obtain BiVO 4 -Rh1%-SrTiO 3 Photoanode, hereinafter referred to as BVO-Rh1%-STO.

Embodiment 3

[0032] The difference from Example 1 is: dissolve 0.5-1ml tetrabutyl titanate in acetic acid, add rhodium nitrate solution according to the ratio of Ti:Rh=97:3, then add 2.5ml deionized water, and stir until the solution is transparent , add 2.5ml of strontium nitrate and citric acid aqueous solution respectively, then stir until the solution is transparent, apply it on the bismuth vanadate electrode that has been prepared by spin coating, and anneal at high temperature after drying to crystallize BiVO 4 -Rh3%-SrTiO 3 The photoanode is hereinafter referred to as BVO-Rh3%-STO.

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Abstract

The invention discloses a rhodium-doped strontium titanate ultrathin nano-layer covered bismuth vanadate photoanode, and a preparation method and application thereof. A BiOI precursor is deposited onthe surface of a fluorine-doped tin oxide (FTO) in a mode of electrochemical deposition; a 0.2M vanadyl acetylacetonate solution is used for exchanging to obtain a bismuth vanadate electrode, and excess V2O5 is removed by using a NaOH solution; and the BiVO4-Rh-SrTiO3 photoanode is synthesized. According to the rhodium-doped strontium titanate ultrathin nano-layer covered bismuth vanadate photoanode provided by the invention, after SrTiO3 subjected to Rh doping is compounded with BiVO4, the photoelectrochemical performance is obviously improved; the electrochemical performance is best when theRh doping amount is 5%; the effect of a heterojunction formed between the BiVO4 and the Rh5%-SrTiO3 is very weak, so that the Rh5%-SrTiO3 exerts a good effect of producing oxygen and assisting catalysis, and the reaction energy barrier of the electrode and an electrolyte contact interface is effectively reduced. In addition, reaction activity sites of the contact interface are increased, so thatholes in a bismuth vanadate valence band can be effectively transferred to the surface of the electrode for an oxidation reaction with water, and the photogenerated electron holes are effectively separated.

Description

technical field [0001] The invention relates to the technical field of preparation of photoanode materials, in particular to a bismuth vanadate photoanode covered with a rhodium-doped strontium titanate ultra-thin nano-layer and a preparation method and application thereof. Background technique [0002] Solar energy is the most abundant, clean and renewable energy on the earth, but at this stage, it is still a huge challenge to realize the effective use of solar energy. Photoelectrochemical water splitting technology can not only capture solar energy efficiently, but also store solar energy in the form of hydrogen and oxygen, which is considered to be a very promising technology. Photoelectrochemical water splitting can be divided into two steps, one is the reduction process to generate hydrogen, and the other is the oxidation process to generate oxygen. The process of hydrogen gas generation requires only two electrons to participate in the reaction, while the process of w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/06
CPCY02E60/36Y02P20/133
Inventor 补钰煜张亚萍敖金平
Owner 西安睿电生物科技有限公司
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