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Large-size nano-porous BiVO4 photo-anode as well as preparation method and application thereof

A photoanode, three-electrode system technology, applied in the direction of electrode, electrode shape/type, energy input, etc., can solve problems such as low charge separation efficiency, increase film thickness, etc., to increase reaction sites, excellent stability, and improve photoelectricity. active effect

Active Publication Date: 2019-03-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the first method will increase the film thickness, and the coupling effect of light absorption efficiency and charge separation efficiency, thinner BiVO 4 Membranes generally have higher light absorption efficiency and lower charge separation efficiency and vice versa
Therefore, how to further improve BiVO 4 The light transmittance of photoanode films while maintaining high photocurrent density to achieve high hydrogen and oxygen evolution efficiencies in photo-water-splitting-photovoltaic tandem systems remains challenging

Method used

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  • Large-size nano-porous BiVO4 photo-anode as well as preparation method and application thereof
  • Large-size nano-porous BiVO4 photo-anode as well as preparation method and application thereof
  • Large-size nano-porous BiVO4 photo-anode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A large-scale nanoporous BiVO 4 A photoanode and a preparation method thereof, comprising the steps of:

[0047] (1) Ultrasonic cleaning of fluorine-doped tin oxide (FTO) conductive glass:

[0048] First cut with a glass knife to obtain a conductive glass with a size of 7.5cm×10.0cm, then ultrasonically clean it with acetone, deionized water and ethanol for 30 minutes, and finally place it in an ethanol solvent.

[0049] (2) Deposit metal Bi:

[0050] First configure 250ml of 0.02mol / L bismuth nitrate solution, and deposit metal bismuth on the conductive glass by controlling the speed of glass immersion in the electrolyte and the amount of deposited charge during the electrodeposition process. The speed of glass immersion in the solution is 0.25cm / s, the deposition voltage is -1.0V Vs Ag / AgCl (reference electrode), and the deposition charge is 0.75C / cm 2 , to obtain the Bi / FTO precursor.

[0051] (3) Calcination to obtain Bi 2 o 3 / FTO precursor:

[0052] Put the...

Embodiment 2

[0058] This example prepares nanoporous BiVO with different Bi deposition charges 4 Photoanode, the preparation method is the same as that of Example 1, the difference is: the change of the charge amount of deposited metal Bi element in step (2): 0.25C / cm 2 , 0.50C / cm 2 , 1.0C / cm 2 .

Embodiment 3

[0060] Schematic diagram of synthesizing a large-scale photoanode:

[0061] Examples 1 and 2 prepare large-sized nanoporous BiVO 4 The specific steps of the photoanode are as follows: figure 1 shown by figure 1 It can be seen that the photoanode preparation and synthesis method of the present invention has simple conditions, no pollution, and low cost. The test materials used are all conventional test materials in the field, and can be purchased through commercial channels.

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Abstract

The invention belongs to the technical fields of new energy and photoelectrochemistry, and specifically discloses a large-size nano-porous BiVO4 photo-anode as well as a preparation method and an application thereof. FTO conductive glass is taken as a substrate, bismuth nitrate is taken as a bismuth source, the FTO glass is immerged into a bismuth nitrate electrolyte at a certain speed, bismuth metal layer deposition and calcining are carried out to obtain bismuth oxide, then the surface of bismuth oxide is coated with DMSO solution containing vanadium(IV)oxy acetylacetonate (VO(acac)2) in a dripping manner, and finally calcining is carried out to obtain the photo-anode. The photo-anode prepared by the preparation method has the advantages of being simple in synthesis method, moderate in reaction conditions, pollution-free and the like, and good in prospect in the fields of photoinduction, capacitors, photoelectrocatalysis, photocatalysis and the like. Via experimental study, the photocurrent density of the nano-porous BiVO4 photo-anode in a photoelectrochemical test exceeds 1.4mA / cm<2>, the photon-to-electron conversion efficiency in a main light absorption area reaches 17%, and excellent stability is shown in the photoelectrochemical test.

Description

technical field [0001] The invention belongs to the technical field of new energy and photoelectrochemistry, and specifically relates to a large-sized nanoporous BiVO 4 A photoanode and its preparation method and application, the photoelectrode material can be assembled into a photoelectrolytic cell for catalytically decomposing pure water for hydrogen evolution and oxygen evolution. Background technique [0002] In recent years, the energy shortage and environmental problems caused by the endless consumption of fossil energy (coal, oil, and natural gas, etc.) have received close attention from all over the world. The most effective way to solve the above problems today is to find ideal energy sources to replace fossil fuels. Abundant and clean solar energy makes it one of the best candidates, and the conversion and utilization of solar energy has become a hot topic in recent years. Because abundant solar energy and water are both renewable resources, photoelectrochemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/04C25B1/04C25D3/54
CPCC25B1/04C25D3/54C25B1/55C25B11/031C25B11/051C25B11/075Y02E60/36Y02P20/133
Inventor 王朋梁希壮黄柏标张晓阳秦晓燕王泽岩郑昭科刘媛媛张倩倩
Owner SHANDONG UNIV
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