Composite electrode material, as well as preparation method and application thereof

A composite electrode and mixed solution technology, applied in electrolytic inorganic material coating, electrode, nanotechnology for materials and surface science, etc., can solve problems such as obstruction and photocorrosion, achieve short diffusion length, low recombination rate, The effect of a large surface area

Inactive Publication Date: 2020-02-07
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although quite good PEC performance has been achieved, the practical application of ZnO / CdS-based photoanodes is still hampered by photocorrosion caused by photogenerated holes on the CdS surface.

Method used

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  • Composite electrode material, as well as preparation method and application thereof
  • Composite electrode material, as well as preparation method and application thereof
  • Composite electrode material, as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A composite electrode material, the composite electrode material is a 3D crosslinked heterostructure ZnO / CdS / BiOI nanorod array, the 3D crosslinked heterostructure ZnO / CdS / BiOI nanorod array is uniformly arranged vertically A one-dimensional ZnO / CdS nanorod array combined with BiOI nanosheets. The ZnO / CdS nanorod array is formed by uniformly dispersing CdS on the surface of the ZnO nanorod array. The molar ratio of ZnO, CdS, and BiOI in the composite electrode material is It is 34:138:1.

[0050] The synthesis steps and mechanism of composite electrode material of the present invention are as figure 1 As shown in (a), ZnO thin films were first prepared on conductive glass (FTO) substrates by electrodeposition, and then dispersed on the surface of ZnO nanorod arrays (NRAs) by CdS to form ZnO / CdS NRAs, and then introduced by solvothermal method BiOI nanosheets, and the separated ZnO / CdS NRAs are connected to each other by many vertically aligned BiOI ultrathin nanosheets...

Embodiment 2

[0058] A composite electrode material, the composite electrode material is a 3D crosslinked heterostructure ZnO / CdS / BiOI nanorod array, the 3D crosslinked heterostructure ZnO / CdS / BiOI nanorod array is uniformly arranged vertically A one-dimensional ZnO / CdS nanorod array combined with BiOI nanosheets. The ZnO / CdS nanorod array is formed by uniformly dispersing CdS on the surface of the ZnO nanorod array. The molar ratio of ZnO, CdS, and BiOI in the composite electrode material is It is 17:69:1.

[0059] The preparation method of the composite electrode material of the present embodiment comprises the following steps:

[0060] (1) Preparation of ZnO nanorod array: Weigh 2.97g zinc nitrate, 0.385g ammonium acetate and 0.701g hexamethylenetetramine, pour them into a 200mL beaker, put a stirring bar in the beaker, add deionized water, Stir magnetically until the solid is completely dissolved, transfer the solution to a 500mL volumetric flask, and constant volume to configure a ZnO...

Embodiment 3

[0066] A composite electrode material, the composite electrode material is a 3D crosslinked heterostructure ZnO / CdS / BiOI nanorod array, the 3D crosslinked heterostructure ZnO / CdS / BiOI nanorod array is uniformly arranged vertically A one-dimensional ZnO / CdS nanorod array combined with BiOI nanosheets. The ZnO / CdS nanorod array is formed by uniformly dispersing CdS on the surface of the ZnO nanorod array. The molar ratio of ZnO, CdS, and BiOI in the composite electrode material is It is 9:35:1.

[0067] The preparation method of the composite electrode material of the present embodiment comprises the following steps:

[0068] (1) Preparation of ZnO nanorod array: Weigh 2.97g zinc nitrate, 0.385g ammonium acetate and 0.701g hexamethylenetetramine, pour them into a 200mL beaker, put a stirring bar in the beaker, add deionized water, Stir magnetically until the solid is completely dissolved, transfer the solution to a 500mL volumetric flask, and constant volume to configure a ZnO ...

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Abstract

The invention relates to a composite electrode material, as well as a preparation method and application thereof, and belongs to the technical field of energy conversion and storage materials. The composite electrode material provided by the invention is a ZnO / CdS / BiOI nanorod array with a three-dimensional (3D) crosslinking heterostructure, and the ZnO / CdS / BiOI nanorod array with the 3D crosslinking heterostructure is formed by perpendicularly and uniformly arranged one-dimensional ZnO / CdS nanorod array and BiOI nanosheets; and the ZnO / CdS nanorod array is formed by uniformly dispersing CdS on the surface of a ZnO nanorod array. According to the composite electrode material provided by the invention, under visible light irradiation (lambda is larger than 420nm), an NRAs photoanode of ZnO / CdS / BiOI shows excellent PEC activity, 9.12 mA*cm<-2> of photocurrent density is produced under 1.1V vs. RHE, and 3.49 percent of high light conversion efficiency and long-term stability over 6000 seconds are realized; and the composite electrode material provided by the invention is low in raw material cost, the preparation method is simple and effective, the synthesis process is green and controllable, the mass production of the material is facilitated, and the composite electrode material has a considerable practical application prospect.

Description

technical field [0001] The invention relates to a composite electrode material and its preparation method and application, belonging to the technical field of energy conversion and storage materials. Background technique [0002] Hydrogen, as a clean and renewable energy source, has attracted great attention due to its potential in solving the current global energy crisis caused by the overuse of fossil fuels and the resulting severe global warming problem. Photoelectrochemical (PEC) water splitting by consuming solar energy to produce hydrogen fuel is considered as a promising and efficient method to convert inexhaustible solar energy into storable hydrogen. Since HONDA Kenichi and FUJISHIMA Akira first reported n-type TiO for water splitting in 1972 2 Since electrodes, many semiconductor materials have been integrated to effectively improve the energy conversion efficiency of PECs, such as Fe 2 o 3 、Cu 2 O and ZnO. [0003] ZnO is a new type of direct bandgap wide-ban...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25D9/04C25B1/04B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C25B1/04C25D9/04C25B1/55C25B11/051C25B11/057C25B11/091Y02E60/36
Inventor 欧阳婷汤紫媛麦秀琼刘兆清
Owner GUANGZHOU UNIVERSITY
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