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A mofs-coated ov-bivo 4 Composite photoanode and its preparation method and application

A composite light, ov-bivo4 technology, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, electrodes, etc., can solve the problems of poor universality, single method, poor stability of photoanode, etc. Achieve the effects of protecting oxygen vacancies, efficient charge separation, and preventing sheet accumulation

Active Publication Date: 2021-05-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method of preparing the core-shell structure photoanode is relatively simple, mainly the photodeposition method. [7] , a surfactant-assisted solvothermal method [6]
There are major problems in the above two methods, among which the photodeposition method is only suitable for the preparation of several types of core-shell structures, and its universality is poor
In addition, the stability of the core-shell structure photoanode synthesized by surfactant as the surface coordination group is poor

Method used

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  • A mofs-coated ov-bivo <sub>4</sub> Composite photoanode and its preparation method and application
  • A mofs-coated ov-bivo <sub>4</sub> Composite photoanode and its preparation method and application
  • A mofs-coated ov-bivo <sub>4</sub> Composite photoanode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present invention changes the ratio of metal elements in NiFe-MOF, the concentration of surface modifier and its type in O V -BiVO 4 Surface-coated MOFs to prepare composite photoanodes:

[0039] BiVO 4 Preparation of nanoarrays: 0.97g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 50ml of 0.4M KI solution, stirred for 10 min, ultrasonicated for 20 min, and the pH of the above mixture was adjusted to 1.6-1.7 with concentrated nitric acid. Then, 20ml of 0.23M p-benzoquinone ethanol solution was added dropwise to the above mixture, and stirred for 5min. Firstly, the BiOI photoelectrode was prepared by electrodeposition method: FTO was used as the working electrode, Ag / AgCl was used as the reference electrode, and Pt was used as the counter electrode, and a voltage of -0.1V was applied respectively. The electrodeposition time was 300s, and then another 300s was deposited to obtain BiOI. photoelectrode. Afterwards, the BiOI photoelectrode was dried in a vacuum oven at 80 °...

Embodiment 2～4

[0046] NiFe-MOF / O with different molar ratios of Ni:Fe in NiFe-MOF V -BiVO 4 Composite photocatalyst, operation steps are the same as embodiment 1, only change FeCl in solvothermal process 3 ·6H 2 O and Ni(NO 3 ) 2 ·6H 2 The amount of O added, and the rest of the conditions are all unchanged, and the samples are numbered as MOB-1, MOB-2, and MOB-3, and the results are shown in Table 1.

[0047] Table 1 NiFe-MOF / O with different molar ratios of Ni:Fe V -BiVO 4 Reaction result of composite photoanode

[0048]

[0049] It can be seen from Table 1 that different water splitting rates are obtained under different molar ratios of Ni and Fe, and the hydrogen production rate is 35.2 μmol h when the molar ratio of Ni and Fe is 1:1 -1 , with an oxygen production rate of 17.8 μmol h -1 , the photocatalytic effect is the best.

Embodiment 5～7

[0051] According to the steps of Example 1 with the best effect, the other conditions remain unchanged (the molar ratio of Ni:Fe is 1:1), only the concentration of caffeic acid is changed to 2mg / ml, 7mg / ml, and 10mg / ml respectively , and its sample numbers are A1, A2, A3, and the results are shown in Table 2.

[0052] Table 2 NiFe-MOFs / O obtained with different concentrations of caffeic acid V -BiVO 4 Reaction result of composite photoanode

[0053]

[0054] It can be seen from Table 2 that photoanode materials with different catalytic activities were obtained under different caffeic acid concentrations, and the photoanode prepared when the concentration of caffeic acid was 5 mg / ml had the best photoelectrocatalytic water splitting effect.

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Abstract

The invention discloses a MOFs uniformly coated O V ‑BiVO 4 The preparation method of composite photoanode comprises the steps: (1) prepare BiVO by the method of electrochemical deposition-heat treatment 4 Nanoarray; (2) the BiVO obtained in step (1) 4 The nanosheet arrays were burned in a hydrogen-containing atmosphere to obtain O V ‑BiVO 4 ; (3) the O obtained in step (2) V ‑BiVO 4 After surface anionization treatment, MOFs were coated onto O by hydrothermal method. V ‑BiVO 4 surface. The present invention coats MOFs on the surface anionized O by solvothermal method. V ‑BiVO 4 On the one hand, the surface coating of MOFs can quickly transfer it and O V ‑BiVO 4 interface holes to achieve efficient charge separation; in addition, it can protect oxygen vacancies and enhance stability.

Description

technical field [0001] The invention relates to the technical fields of nanomaterial preparation and photoelectric catalysis, in particular to a MOFs-coated O V -BiVO 4 Composite photoanode and its preparation method and application in photocatalytic water splitting. Background technique [0002] With the rapid development of industry, on the one hand, energy consumption is huge, and human beings are facing the threat of energy shortage; on the other hand, the use of fossil energy has caused serious environmental pollution. Therefore, the development and utilization of new energy sources has become the research focus of scientists from all over the world. Among them, hydrogen has the characteristics of high energy density, wide sources, and environmental friendliness, and is considered as a potential energy material to replace fossil energy in the future. The application of photocatalytic water splitting technology for hydrogen production is considered to be an effective ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/095C25B1/04C25B1/55C25B9/65C25B9/50
CPCC25B1/04C25D9/04B01J31/36B01J31/1691B01J31/223C25B11/057C25B11/075B01J35/39Y02E60/36
Inventor 尹双凤潘金波申升陈浪郭君康
Owner HUNAN UNIV