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Preparation method and application of CoOOH nanosheet modified Fe2O3 composite photo-anode

A technology of composite light and nanosheets, applied in electrodes, liquid chemical plating, coatings, etc., can solve the problems of complex experimental steps of photoanode materials and reduce the interface contact barrier, so as to promote the separation of photogenerated carriers and reduce the Water oxidation overpotential and high catalytic activity

Active Publication Date: 2019-10-15
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The experimental steps for preparing cobalt oxyhydroxide-modified photoanode materials using the above method are too complicated and subject to many limitations, especially in the second spin-coating process that requires more precise control to make BiVO 4 Form a good interface contact with CoOOH, reduce the interface contact barrier, thereby promoting charge separation

Method used

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Effect test

Embodiment 1

[0031] A CoOOH nanosheet modified Fe 2 o 3 The preparation method of composite light anode, it comprises the steps:

[0032] (a) Fe 2 o 3 Preparation of Electrode Sheets

[0033] Weigh 1.0812 g of FeCl 3 Put 0.5405 g of urea in a 100 mL beaker, add 50 mL of deionized water to dissolve it; then place the cleaned FTO substrate in the beaker, seal it and place the beaker in an oven at 100°C for 4 h; cool to room temperature, remove. Then it was washed with deionized water, dried at 80°C for 12 h; finally put into a muffle furnace for calcination at 500°C for 3 h, after cooling, it was annealed in a muffle furnace at 750°C for 15 min to obtain Fe 2 o 3 electrode sheet;

[0034] (b) CoOOH / Fe 2 o 3 Preparation of -E1 composite photoanode

[0035] Prepare 100 mL of 0.1 mol / L Co(NO 3 ) 2 solution, according to Co 2+ Add EDTA at a molar ratio of 1:1 to form 0.1 mol / L CoEDTA mixture. The previously prepared Fe 2 o 3 Electrodes were immersed in CoEDTA solution for 1 min ...

Embodiment 2

[0037] A CoOOH nanosheet modified Fe 2 o 3 The preparation method of composite light anode, it comprises the steps:

[0038] (a) Fe 2 o 3 Preparation of Electrode Sheets

[0039] Prepared according to the method and conditions of step (a) in Example 1;

[0040] (b) CoOOH / Fe 2 o 3 Preparation of -E2 composite photoanode

[0041] Prepared according to the method and conditions of step (b) in Example 1; the difference is that the number of times of dipping is 2 times.

Embodiment 3

[0043] A CoOOH nanosheet modified Fe 2 o 3 The preparation method of composite light anode, it comprises the steps:

[0044] (a) Fe 2 o 3 Preparation of Electrode Sheets

[0045] Prepared according to the method and conditions of step (a) in Example 1;

[0046] (b) CoOOH / Fe 2 o 3 Preparation of -E3 composite photoanode

[0047] Prepare according to the method and conditions of step (b) in Example 1; the difference is that the number of times of dipping is 4 times.

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Abstract

The invention provides a preparation method and application of a CoOOH nanosheet modified Fe2O3 composite photo-anode. The preparation method comprises the following steps: (1) impregnating a preparedFe2O3 electrode plate into a pre-prepared soluble cobalt salt aqueous solution, then carrying out air-purging drying on the electrode plate, and repeating the impregnating operation for several times; and (2) placing the Fe2O3 electrode slice impregnated with the cobalt salt in a strong alkaline solution for hydrolysis, then centrifugally washing the Fe2O3 electrode slice with deionized water, and drying the electrode slice in a drying oven to obtain the CoOOH nanosheet modified Fe2O3 composite photo-anode material. The method provided by the invention is simple and mild to operate, can be completed at room temperature, greatly reduces the energy consumption and risk of synthesis compared with the traditional synthesis method, and has a series of advantages of high catalytic water oxidation activity, good reaction kinetics and the like when being used as a photoelectrically decomposed water anode.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a CoOOH nanosheet modified Fe 2 o 3 Preparation method and application of composite photoanode. Background technique [0002] Hydrogen energy has the advantages of high energy density, easy storage and transportation, environmental friendliness, and zero carbon emissions, making it the most ideal energy carrier. The use of solar energy to drive water splitting, especially hydrogen production through photoelectrochemical conversion, is considered to be one of the ideal ways to obtain hydrogen energy. In recent years, focusing on the actual needs of solving energy problems, semiconductor materials that respond to visible light with light absorption efficiency close to the solar photon luminous flux, such as WO 3 、BiVO 4 , Fe 2 o 3 Metal oxides such as metal oxides have been developed and utilized in large quantities, and have gradually become the "hot spot" system of people...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B11/06C25B1/04C23C18/12
CPCC23C18/1204C23C18/1245C25B1/04C25B1/55C25B11/051C25B11/057C25B11/075Y02E60/36
Inventor 种瑞峰常志显王珍珍杜羽庆张凌李德亮
Owner HENAN UNIVERSITY
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