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Preparation method and application of Cu-MOF/BiVO4 composite photoelectrode

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

Active Publication Date: 2019-11-05
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 (about 5% of sunlight), which greatly limits the BiVO 4 Applications in solar water splitting

Method used

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  • Preparation method and application of Cu-MOF/BiVO4 composite photoelectrode
  • Preparation method and application of Cu-MOF/BiVO4 composite photoelectrode
  • Preparation method and application of Cu-MOF/BiVO4 composite photoelectrode

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Experimental program
Comparison scheme
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 solution A as 0.4M KI solution and 0.04M Bi(NO 3 ) 3 The mixed liquid of the solution is 50ml in total, adjust the pH to 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, use the constant voltage electrochemical deposition method to conduct electrodeposition on the FTO substrate, and electrodeposit 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 acetylace...

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 solution A as 0.4M KI solution and 0.04M Bi(NO 3 ) 3 The mixed liquid of the solution is 50ml in total, adjust the pH to 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, use the constant voltage electrochemical deposition method to conduct electrodeposition on the FTO substrate, and electrodeposit 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 acetylace...

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 solution A as 0.4M KI solution and 0.04M Bi(NO 3 ) 3 The mixed liquid of the solution is 50ml in total, adjust the pH to 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, and use the constant voltage electrochemical deposition method to conduct electrodeposition on the FTO substrate, and electrodeposit for 5 minutes 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 ...

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Abstract

The invention belongs to the technical field of synthesis of nano-composite materials, relates to a preparation method of a composite electrode, and especially relates to a preparation method and an application of a Cu-MOF / BiVO4 composite photoelectrode. The preparation method of the Cu-MOF / BiVO4 composite photoelectrode comprises the following steps: preparing BiVO4 with a wormlike structure on an FTO substrate by electrochemical deposition and calcination processes, controllably loading a layer of Cu-O on the surface of the BiVO4 by the electrochemical deposition process, and reacting the Cu-O with an organic ligand by means of a hydrothermal synthesis process to introduce an ultrathin Cu-MOF film on the surface of BiVO4 in situ. The composite photoelectrode can also be applied to a photoelectrochemical water decomposition reaction as a working electrode. The method allows the ultrathin Cu-MOF to be loaded on the surface of BiVO4 with the worm-like structure by the simple and feasible method, can effectively improve the electron and hole separation efficiency of the photoelectrode and enhance the ability to capture visible light in order to construct the novel composite photoelectrode capable of efficiently converting solar energy-chemical energy, and has excellent photoelectrochemical performances and a good chemical stability; and the method has the advantages of simple process, good repeatability, and meeting environmentally friendly requirements.

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) splitting water 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, making hydrogen energy in the future There are broad application prospects. The photoresponsiveness, photogenerated charge transfer, bandgap structure, and stability of sem...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/04C25B11/06
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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