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A cu-mof/bivo 4 Preparation method and application of composite photoelectrode

A composite photoelectrode technology, applied in electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of easy recombination and confinement of photogenerated electrons and holes, and achieve cheap and non-toxic materials, enhanced capture ability, good chemical The effect of stability

Active Publication Date: 2021-05-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] BiVO 4 As one of the earliest known semiconductors for solar hydrogen production, however, due to BiVO 4 The forbidden band width is wide (about 2.4eV), the internal photogenerated electrons and holes are easy to recombine, and they can only respond to ultraviolet light (only about 5% of sunlight), which greatly limits the BiVO 4 Applications in solar water splitting

Method used

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  • A cu-mof/bivo <sub>4</sub> Preparation method and application of composite photoelectrode
  • A cu-mof/bivo <sub>4</sub> Preparation method and application of composite photoelectrode
  • A cu-mof/bivo <sub>4</sub> Preparation method and application of composite photoelectrode

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A Cu-MOF / BiVO 4 The preparation method of composite photoelectrode comprises steps as follows:

[0028] A. BiVO with worm-like structure prepared on FTO substrate 4

[0029] The BiVO with worm-like structure prepared on the FTO substrate 4 The steps are:

[0030] (1) First, prepare liquid A as 0.4M KI solution and 0.04M Bi(NO 3 ) 3 The mixed solution of the solution is 50ml in total, adjust the pH=1.7 with concentrated nitric acid (3 drops of concentrated nitric acid), the B solution is 20ml of 0.23M ethanol solution of p-benzoquinone, and the AB solution is mixed evenly;

[0031] (2) Then use the mixed solution as the electrolyte, and use the constant voltage electrochemical deposition method to perform electrodeposition on the FTO substrate, and electrodeposit it for 5 minutes under the applied bias voltage -0.1V (relative to Ag / AgCl), and then obtain the BiOI photoelectrode ;

[0032] (3) Prepare 10ml of 0.2M dimethyl sulfoxide (DMSO) solution of vanadyl acety...

Embodiment 2

[0042] A Cu-MOF / BiVO 4 The preparation method of composite photoelectrode comprises steps as follows:

[0043] A. BiVO with worm-like structure prepared on FTO substrate 4

[0044] The BiVO with worm-like structure prepared on the FTO substrate 4 The steps are:

[0045] (1) First, prepare liquid A as 0.4M KI solution and 0.04M Bi(NO 3 ) 3 The mixed solution of the solution is 50ml in total, adjust the pH=1.7 with concentrated nitric acid (3 drops of concentrated nitric acid), the B solution is 20ml of 0.23M ethanol solution of p-benzoquinone, and the AB solution is mixed evenly;

[0046] (2) Then use the mixed solution as the electrolyte, and use the constant voltage electrochemical deposition method to perform electrodeposition on the FTO substrate, and electrodeposit it for 5 minutes under the applied bias voltage -0.1V (relative to Ag / AgCl), and then obtain the BiOI photoelectrode ;

[0047] (3) Prepare 10ml of 0.2M dimethyl sulfoxide (DMSO) solution of vanadyl acety...

Embodiment 3

[0053] A Cu-MOF / BiVO 4 The preparation method of composite photoelectrode comprises steps as follows:

[0054] A. BiVO with worm-like structure prepared on FTO substrate 4

[0055] The BiVO with worm-like structure prepared on the FTO substrate 4 The steps are:

[0056] (1) First, prepare liquid A as 0.4M KI solution and 0.04M Bi(NO 3 ) 3 The mixed solution of the solution is 50ml in total, adjust the pH=1.7 with concentrated nitric acid (3 drops of concentrated nitric acid), the B solution is 20ml of 0.23M ethanol solution of p-benzoquinone, and the AB solution is mixed evenly;

[0057] (2) Then use the mixed solution in step (1) as the electrolyte, utilize the constant voltage electrochemical deposition method to carry out electrodeposition on the FTO substrate, and electrodeposit 5min under the applied bias voltage-0.1V (relative to Ag / AgCl), That is, the BiOI photoelectrode is obtained;

[0058] (3) Prepare 10ml of 0.2M dimethyl sulfoxide (DMSO) solution of vanadyl ...

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Abstract

The invention belongs to the technical field of synthesis of nanocomposite materials, and relates to the preparation of composite electrodes, in particular to a Cu-MOF / BiVO 4 Preparation method and application of composite photoelectrode. In the present invention, BiVO₄ with a worm-like structure is firstly prepared on the FTO substrate by electrochemical deposition and calcination, and then a layer of Cu₂O is controllably loaded on the surface of BiVO₄ by electrochemical deposition, and finally Cu₂O and organic Ligand reaction, in situ introduction of ultrathin Cu‑MOF films on the surface of BiVO₄. It can also be used as a working electrode in the photoelectrochemical water splitting reaction. The present invention uses a simple and feasible method in the BiVO of worm-like structure 4 The ultra-thin Cu-MOF loaded on the surface can effectively improve the separation efficiency of electrons and holes of the photoelectrode, and enhance its ability to capture visible light, and finally realize the construction of a new type of composite photoelectrode that can efficiently convert solar-chemical energy , has excellent photoelectrochemical properties and good chemical stability; the invention has simple process, good repeatability, and meets the requirement of environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of synthesis of nanocomposite materials, and relates to the preparation of composite electrodes, in particular to a Cu-MOF / BiVO 4 Preparation method and application of composite photoelectrode. Background technique [0002] With the increasing environmental pollution and energy crisis in the world, it is urgent to find and develop sustainable clean energy. Therefore, the development and utilization of green energy has become one of the most important challenges facing mankind. Photoelectrochemical (PEC) water splitting to produce hydrogen is a potential hydrogen production technology, which can realize the conversion of solar energy to chemical energy, and hydrogen has the advantages of non-polluting combustion and high calorific value, so that hydrogen can be used in the future There are broad application prospects. The photoresponsiveness, photogenerated charge transfer, bandgap structure, and stability ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/087C25B11/067C25B11/054C25B1/04C25B1/55
CPCC25B1/04C25B1/55C25B11/051C25B11/095Y02E60/36Y02P20/133
Inventor 白红叶邱可佳刘贞乾范伟强崔伟成
Owner JIANGSU UNIV
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