Method for preparing Bi/BiVO4 composite photoanode material by photodeposition

A photoanode and photodeposition technology, which is applied in the direction of electrodes, metal material coating technology, electrolysis process, etc., can solve the problems of unstable chemical properties, weak absorption capacity, and low conversion efficiency of incident photons

Active Publication Date: 2017-03-15
NORTHWEST NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the unstable chemical properties of these materials, the electron-hole pairs are easy to recombine, the visible light absorption ability is weak, and the electron-hole pair migration speed is slow and other factors limit their application in the field of photoelectrochemistry.
Even though its performance has been improved through various modifications, the incident photon conversion efficiency is still low

Method used

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  • Method for preparing Bi/BiVO4 composite photoanode material by photodeposition
  • Method for preparing Bi/BiVO4 composite photoanode material by photodeposition
  • Method for preparing Bi/BiVO4 composite photoanode material by photodeposition

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Effect test

Embodiment 1

[0037] (1) BiVO 4 Preparation of photoanode: According to the method of electrodeposition combined with heat treatment by Kim and Choi's group, porous BiVO 4 The membrane was successfully prepared. Steps: First, BiOI nanosheets were prepared by electrodeposition using CHI 660D electrochemical workstation. FTO glass cleaned ultrasonically with acetone / isopropanol / distilled water (volume ratio: 1:1:1) was used as the working electrode, the Ag / AgCl (3.5 M KCl) electrode was used as the reference electrode, and the Pt electrode was used as the counter electrode. with 6M HNO 3 Adjust the pH of 50 mL0.4 M KI solution to 1.5~1.7, then add 0.970 g Bi(NO 3 ) 3 ·5H 2 O until dissolved and the solution color changed to orange-red. Then slowly add 20ml 0.498 g 1,4-benzoquinone ethanol solution dropwise and stir for several minutes, the solution turns blood red again. Electrodeposition was scanned by cyclic voltammetry, voltage: -0.13-0 V, scan rate: 5 mV / s. The obtained BiOI film ...

Embodiment 2

[0040] (1) BiVO 4 The preparation of photoanode: with embodiment 1;

[0041] (2) Bi / BiVO 4 Preparation of composite photoanode: the BiVO 4 The electrode was soaked in 20 mL 0.01 M Bi(NO 3 ) 3 ·5H 2 O in ethylene glycol / water (V%=1) solution, irradiated with 300 W xenon lamp for 60 min to make BiVO 4 A layer of gray-black film was evenly grown on the film; it was washed completely with ethanol to obtain Bi / BiVO 4 Composite photoanode, labeled Bi / BV-60. When U=1.3V, I=9.48mA / cm 2 .

Embodiment 3

[0043] (1) BiVO 4 The preparation of photoanode: with embodiment 1;

[0044] (2) Bi / BiVO 4 Preparation of composite photoanode: the BiVO 4 The electrode was soaked in 20 mL 0.01 M Bi(NO 3 ) 3 ·5H 2 O in ethylene glycol / water (V%=1) solution, irradiated with 300 W xenon lamp for 90 min to make BiVO 4 A layer of gray-black film was evenly grown on the film; it was washed completely with ethanol to obtain Bi / BiVO 4Composite photoanode, labeled Bi / BV-90. When U=1.3V, I=8.4mA / cm 2 .

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Abstract

The invention discloses a method for preparing a Bi/BiVO4 composite photoanode material by photodeposition. The method comprises the following steps: soaking a BiVO4 electrode in an ethylene glycol/water mixed solution of Bi(NO3)3 5H2O, and illuminating to uniformly generate a layer of an ash black film on the surface of the BiVO4 electrode; and washing with ethyl alcohol to obtain a Bi/BiVO4 composite photoanode. According to the method, metal Bi particles are successfully loaded on a multihole BiVO4 thin film in a simple photo-reduction process; furthermore, introduction of the metal Bi particles enlarges an absorption range of bismuth vanadate to visible light; meanwhile, electrons in the metal Bi particles are transferred onto a BiVO4 conduction band to increase the concentration of current carriers; and a hole in the BiVO4 surface in a pure Na2SO4 solution oxidizes part of the metal Bi nano particles, so that separation of electron-hole pairs is effectively promoted, and the photoelectric chemical decomposition performance of water is improved.

Description

technical field [0001] The present invention relates to a BiVO 4 Preparation of composite photoanode materials, especially Bi / BiVO 4 The method for composite photoelectric anode materials is mainly used in a three-electrode system for photoelectric hydrogen production, and belongs to the technical field of composite materials and the field of clean energy. Background technique [0002] At present, hydrogen is considered to be the most ideal clean energy because it has high combustion value and non-polluting products, so it is widely used to replace fossil fuels to solve energy shortage and environmental pollution problems. Now many scholars are exploring the method of hydrogen production. Since Fujisima and Honda discovered TiO in 1972 2 Electrodes can photocatalytically split water, and photocatalytic water splitting technology and photoelectric water splitting technology have begun to develop rapidly. The photoelectric water splitting reaction has high efficiency and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/14C23C18/08C25B11/03C25B11/04C25B1/04
CPCC23C18/08C23C18/14C25B1/04C25B1/55C25B11/031C25B11/075Y02E60/36Y02P20/133
Inventor 王其召牛腾娇和继娟白燕张淑玲佘厚德王芳平
Owner NORTHWEST NORMAL UNIVERSITY
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