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Method for maintaining stability of ms-BiVO4 in water photolysis reaction

A ms-bivo4, stability technology, applied in the field of photocatalysis, can solve problems such as easy decomposition, achieve the effect of reducing dissolution rate, reducing overpotential and improving stability

Inactive Publication Date: 2017-08-29
NORTHWEST UNIV
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  • Application Information

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Problems solved by technology

Currently, ms-BiVO 4 Only stable in weakly acidic environment, easy to decompose after exposure to light or voltage

Method used

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  • Method for maintaining stability of ms-BiVO4 in water photolysis reaction
  • Method for maintaining stability of ms-BiVO4 in water photolysis reaction
  • Method for maintaining stability of ms-BiVO4 in water photolysis reaction

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Embodiment Construction

[0017] In order to make the objects and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] The embodiment of the present invention provides a method to maintain ms-BiVO in the photolysis of water reaction 4 method of stability,

[0019] A certain amount of NaVO was added to the solution of photolysis of water to produce oxygen 3 or KVO 3 Or other soluble vanadate, metavanadate, add NaVO 3 or KVO 3 After that, it will make ms-BiVO 4 The chemical stability and photoelectrochemical stability are significantly improved, especially the electrochemical stability in alkaline environment can be improved, and the ms-BiVO 4 The performance of the photoelectrocatalytic water splitting was not significantly affected by the NaVO in th...

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Abstract

The invention discloses a method for maintaining the stability of ms-BiVO4 in water photolysis reaction. The method is implemented by adding 0.5 to 1.5 mol / Kg of soluble vanadate or metavanadate into a solution for producing oxygen through water photolysis. The method is simple, stable and easy to operate. Compared with the conventional technology, the method has the advantages that the water photolysis range of the ms-BiVO4 in an aqueous solution can be obviously increased, so that the dissolving speed of the ms-BiVO4 under the union action of illumination and bias voltage is effectively reduced, and the stability of water photolysis of the ms-BiVO4 is greatly improved. Furthermore, a water photolysis solution can be expanded into an alkaline range; in an alkaline environment, by the existence of lots of OH<-> ions, the OH<-> ions are easily adsorbed on the surface of the ms-BiVO4, so that the oxygen production overpotential is reduced, and the oxygen yield is increased. Meanwhile, dissolved vanadate is relatively low in absorption for light, so that no influence is caused on the absorption efficiency for the light on an ms-BiVO4 electrode.

Description

technical field [0001] The invention relates to the fields of photocatalysis, photoelectric catalysis, etc., in particular to a method for maintaining ms-BiVO in photolysis water reaction 4 method of stability. Background technique [0002] Photocatalytic and photocatalytic water splitting are approaches to produce hydrogen and oxygen from water without causing environmental pollution, and hold great promise for future energy storage and solar energy utilization. Ms-BiVO 4 (Monoclinic clinobis vanite Bismuth scheelite), as a catalyst for photo- and photo-water splitting, has attracted a lot of attention due to the advantages of suitable energy band positions, easy synthesis of materials, and abundant raw materials. At present, the photocurrent density has been significantly improved through morphology control, n-type doping, heterojunction formation, co-catalyst loading and surface state generation. Currently, ms-BiVO 4 It is only stable in a weakly acidic environment, a...

Claims

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Application Information

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IPC IPC(8): C01G31/00C01B3/04
CPCC01B3/042C01B2203/0277C01G31/00C01P2002/72C01P2004/03C01P2006/40Y02E60/36
Inventor 胡军何世军王祯王甜甜王超明
Owner NORTHWEST UNIV
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