Bismuth vanadate-metal organic complex composite photoelectrode and preparation method and application thereof

A technology of metal-organic complexes, applied in the field of photoelectrodes, can solve the problems of poor photoelectrochemical performance, limited stability, slow kinetics, etc., and achieve excellent photoelectrochemical performance, reduce surface recombination rate, and increase photocurrent density. Effect

Active Publication Date: 2021-12-21
TAIZHOU UNIV +1
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  • Abstract
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Problems solved by technology

[0003] There are still two key problems in the industrial application of bismuth vanadate photoelectrodes: the stability of bismuth vanadate is poor, it is prone to dissolution corrosion in alkaline solution, and it is prone to photocorrosion under light, which greatly limits its long-term stability. stability; the water oxidation reaction at the bismuth vanadate / solution interface involves four-electron transfer, which is kinetically extremely slow, resulting in a weaker activity for water splitting
However, currently existing inorganic electrocatalyst technical solutions (such as ShiY, YuY, YuY, et al.Boosting Photoelectrochemical WaterOxidation Activity and Stability of Mo-Doped BiVO 4 through the UniformAssembly Coating of NiFe–Phenolic Networks[J].ACS Energy Letters,2018:acsenergylett.8b00855.), the inorganic electrocatalyst coated bismuth vanadate is not uniform, which easily leads to the penetration of ions in the solution into the bismuth vanadate layer and Chemical corrosion occurs and the structural stability is poor, so the photoelectrochemical performance is not good

Method used

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  • Bismuth vanadate-metal organic complex composite photoelectrode and preparation method and application thereof

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preparation example Construction

[0041] The present invention also provides a method for preparing a bismuth vanadate-metal organic complex composite photoelectrode described in the above technical solution, comprising the following steps:

[0042] Provide BiVO 4 photoelectrode, the BiVO 4 The photoelectrode includes a substrate and BiVO loaded on the surface of the substrate 4 thin film, the BiVO 4 Thin films made of BiVO 4 particle formation;

[0043] mixing an inorganic metal salt, an organic ligand and a solvent to obtain an inorganic metal salt-ligand mixed liquid; the inorganic metal salt includes an inorganic ferrous salt; the organic ligand is 2,5-dihydroxyterephthalic acid;

[0044] BiVO 4 The photoelectrode is immersed in the inorganic metal salt-ligand mixed solution, and the hydrothermal reaction is carried out to obtain the bismuth vanadate-metal organic complex composite photoelectrode.

[0045] In the present invention, unless otherwise specified, each reagent in the preparation method is...

Embodiment 1

[0083] Potassium iodide and ultrapure water were mixed, and the concentrated nitric acid with a concentration of 68wt% was used to adjust the pH value to 1.7 to obtain a potassium iodide aqueous solution with a concentration of 0.5mol / L; bismuth nitrate was mixed with the potassium iodide aqueous solution, and ultrasonically dissolved to obtain bismuth nitrate Concentration is the potassium iodide-bismuth nitrate mixed solution of 0.06mol / L;

[0084] P-benzoquinone is mixed with ethanol, and ultrasonically dissolved to obtain an ethanol solution of p-benzoquinone with a p-benzoquinone concentration of 0.3mol / L;

[0085] Mix the potassium iodide-bismuth nitrate mixed solution and the ethanol solution of p-benzoquinone at a volume ratio of 5:2, and stir evenly to obtain an electrolyte solution; in the presence of the electrolyte solution, use FTO conductive glass as the working electrode, Ag The / AgCl electrode is used as the reference electrode, and the platinum mesh is used as...

Embodiment 2

[0095] Prepare BiVO according to the method of Example 1 4 Photoelectrode;

[0096] Mix ferrous chloride, ligand 2,5-dihydroxyterephthalic acid and a solvent, wherein the solvent is a mixed solution of ethanol, water and N,N-dimethylformamide, ethanol, water and N,N -The volume ratio of dimethylformamide is 1:1:20 to obtain the inorganic ferrous salt-ligand mixed solution, the concentration of ferrous chloride in the inorganic ferrous salt-ligand mixed solution is 10.42mmol / L , the concentration of ligand is 22.22mmol / L;

[0097] The resulting BiVO 4 The photoelectrode is placed in a stainless steel autoclave, and the conductive surface leans against the lining of the stainless steel autoclave, and the inorganic ferrous salt-ligand solution is added to the lining of the stainless steel autoclave until the BiVO is submerged. 4 The photoelectrode was subjected to a hydrothermal reaction at 120°C for 8 hours. After the reaction, the resulting hydrothermal reaction product was ...

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Abstract

The invention belongs to the technical field of photoelectrodes, and particularly relates to a bismuth vanadate-metal organic complex composite photoelectrode and a preparation method and application thereof. The bismuth vanadate-metal organic complex composite photoelectrode provided by the invention comprises a substrate and a BiVO4-metal organic complex composite film loaded on the surface of the substrate, and the BiVO4-metal organic complex composite film is composed of BiVO4-metal organic complex particles; the BiVO4-metal organic complex particle comprises a BiVO4 inner core and a shell which is formed by a metal organic complex and coats the BiVO4 inner core; and the metal organic complex is a Fe<2+>-2,5-dihydroxy terephthalic acid complex. The bismuth vanadate-metal organic complex composite photoelectrode provided by the invention has the characteristics of high structural stability, excellent photoelectrochemical performance and high chemical stability.

Description

technical field [0001] The invention belongs to the technical field of photoelectrodes, in particular to a bismuth vanadate-metal organic complex composite photoelectrode, a preparation method and application thereof. Background technique [0002] Semiconductor photocatalytic water oxidation can combine the advantages of photocatalysis and electrocatalysis, and can split water into H under the condition of small bias voltage and sunlight irradiation. 2 and O 2 . At present, researchers have developed a variety of semiconductor photoanodes for semiconductor photocatalytic water oxidation, such as ZnO, Fe 2 o 3 、TiO 2 、WO 3 、CuWO 4 or BiVO 4 . Among them, monoclinic bismuth vanadate (BiVO 4 ) has attracted the attention of researchers due to its narrow band gap (approximately 2.4eV) and wide spectral absorption range. [0003] There are still two key problems in the industrial application of bismuth vanadate photoelectrodes: the stability of bismuth vanadate is poor,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/095C25B1/55C25B1/04
CPCC25B11/095C25B1/55C25B1/04Y02P20/133Y02E60/36
Inventor 熊贤强艾成浩梅优阳张晓韩得满李江山程高飞武承林
Owner TAIZHOU UNIV
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