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BiVO4 nano photoelectrode and application thereof in hydrogen production from water splitting

A nano-light and electrode technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of only 490nm light response range and low quantum efficiency, and achieve the effect of easy mass production, simple preparation method and cheap raw materials

Inactive Publication Date: 2010-07-14
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nakato applied for BiTMO 6 (M=V, Nb, Ta), BiZn 2 VO 6 The patent of photoelectrochemical hydrogen production by composite oxide particle film (US20080105535A1), however, its quantum efficiency is lower than 0.6%, and the photoresponse range is only 490nm
There is currently no information on doping BiVO 4 Electrode used as a photoanode to split water to produce hydrogen by photoelectrochemical method

Method used

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  • BiVO4 nano photoelectrode and application thereof in hydrogen production from water splitting
  • BiVO4 nano photoelectrode and application thereof in hydrogen production from water splitting
  • BiVO4 nano photoelectrode and application thereof in hydrogen production from water splitting

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Step 1. with the glacial acetic acid solution of 0.2mol / L bismuth nitrate and the acetylacetone solution of 0.03mol / L vanadium acetylacetonate, the acetylacetone solution of 0.01mol / L molybdenum acetylacetonate, by Bi: (V+Mo) mol ratio 1 : 1 for mixing, the molar concentration of Mo ions accounted for 3% of Bi ions, and a clear solution was obtained.

[0033] Step 2. Spin-coat the solution obtained in step 1 onto conductive glass (FTO), dry it at 150° C., and then calcinate it in air at 455° C. for 30 minutes to obtain a thin film. A nanoporous film with a thickness of 1 micron can be obtained by repeating the above operation 4 times.

[0034] Mo-doped BiVO was obtained through the above steps 4 Nano photoelectrode.

Embodiment 2

[0036] The cocatalyst Co was impregnated 3 o 4 Loaded on the Mo-doped BiVO obtained in Example 1 4 The surface of the nanometer photoelectrode was baked at 300°C for 2 hours to obtain the cocatalyst Co 3 o 4 Modified Mo-doped BiVO 4 Nano photoelectrode.

Embodiment 3

[0038] The cocatalyst Fe was impregnated 2 o 3 Loaded on the Mo-doped BiVO obtained in Example 1 4 The surface of the nanometer photoelectrode was baked at 300°C for 2 hours to obtain the cocatalyst Fe 2 o 3 Modified Mo-doped BiVO 4 Nano photoelectrode.

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Abstract

The invention relates to a BiVO4 nano photoelectrode and application thereof in the aspect of hydrogen production from water splitting, which can increase photocurrent and greatly improve the efficiency of quantum conversion. The BiVO4 nano photoelectrode comprises a BiVO4 nano-pore thin film, and BiVO4 is doped with metal cation, wherein the metal cation is one or a mixture with an arbitrary proportion of more than two of Sr<2+>, Ba<2+>, Cr<6+> and W<6+> by arbitrary proportion. As an improvement of the invention, the surface of the BiVO4 nano-pore thin film is also modified with a catalyst, wherein the catalyst is one or a mixture with an arbitrary proportion of more than two of the oxides of the hydroxides of Rh, W, Mo, Co, Fe, Mn and Ni. Compared with a pure BiVO4 electrode, the quantum conversion efficiency of the invention is greatly increased and reaches 70 percent within a wavelength range of 360-450nm, and a photoresponse range is broadened to 510nm.

Description

technical field [0001] The present invention relates to BiVO 4 Nanophotoelectrode and its application in splitting water to produce hydrogen. technical background [0002] As a clean and environmentally friendly hydrogen energy, it has a high combustion calorific value and many utilization methods. It is considered an ideal secondary energy source, but it must be obtained through primary energy. At present, large-scale hydrogen production in industry mainly adopts the method of thermal cracking of natural gas, which consumes limited fossil energy and also brings serious environmental pollution. Therefore, using solar energy to split water to produce hydrogen will be one of the important sources of large-scale hydrogen production in the future. A photoelectrochemical cell is a system that directly converts solar energy into chemical energy using wet chemical methods. It uses the direct contact between semiconductors and electrolytes to achieve the purpose of solar energy co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B11/06C25B1/04
CPCY02E60/366Y02E60/36
Inventor 邹志刚罗文俊李朝升
Owner NANJING UNIV
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