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High photoelectric conversion efficiency bi 2 moo 6 Photoanode and its preparation method and application

A technology of photoelectric conversion efficiency and photoanode, which is applied in the field of photoelectrochemistry, can solve the problems of small optical flow and low quantum efficiency, and achieve the effects of short time consumption, simple preparation method, and large-scale preparation

Active Publication Date: 2020-04-10
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, about Bi 2 MoO 6 There are not many reports on the application in PEC, and in a small number of reports, the optical flux produced by it is small and the quantum efficiency is low

Method used

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  • High photoelectric conversion efficiency bi <sub>2</sub> moo <sub>6</sub> Photoanode and its preparation method and application
  • High photoelectric conversion efficiency bi <sub>2</sub> moo <sub>6</sub> Photoanode and its preparation method and application
  • High photoelectric conversion efficiency bi <sub>2</sub> moo <sub>6</sub> Photoanode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Bi 2 MoO 6 Preparation of photoanode

[0023] (1) Bi 2 MoO 6 Preparation of powder:

[0024] 1) Take 2.425g Bi(NO 3 ) 3 ·5H 2 O and 0.442g (NH 4 ) 6 Mo 7 o 24 4H 2 O was respectively dissolved in a mixed solution of 15ml deionized water and ethanol (v:v=1:1), and magnetically stirred for 15min at the same time;

[0025] 2) The above two solutions were mixed and stirred for 20 minutes, and the resulting solution was transferred to a 50ml stainless steel autoclave, placed in a muffle furnace, and heated at 160°C for 15 hours;

[0026] 3) After cooling to room temperature, the samples were taken out for centrifugation, washed three times with deionized water and ethanol to remove residues, and then dried at 70°C. Finally, a yellow powder is obtained as Bi 2 MoO 6 .

[0027] (2) High photoelectric conversion efficiency Bi 2 MoO 6 Preparation of photoanode (BMO-S):

[0028] 1) Magnetron sputtering deposition process: First, install Bi 2 MoO 6 T...

Embodiment 2

[0035] Example 2 Bi 2 MoO 6 Application of photoanode film

[0036] The BMO and BMO-S photoanodes prepared in Example 1 were subjected to a series of photoelectrochemical performance tests such as photocurrent, impedance, and quantum efficiency.

[0037] All electrochemical experiments were carried out in an electrochemical workstation (Princeton Applied Research 2273) with a three-electrode system. The sample film is used as the working electrode, the platinum sheet is used as the counter electrode, Ag / AgCl is used as the reference electrode, the electrolyte is 0.5M sodium sulfate, and the light irradiation area of ​​the sample is 1cm 2 .

[0038] Photocurrent test: the light source is 300W xenon lamp, the bias voltage is 1.18v vs.V RHE , the measured results are as image 3 As shown, the results show that the photocurrent of BMO-S is 13 times that of BMO.

[0039] Electrochemical impedance spectroscopy (EIS) test: the fixed voltage is 0V vs.V oc , the frequency range ...

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Abstract

The invention provides a high-photoelectric-conversion-efficiency Bi2MoO6 photo-anode and a preparation method and application thereof. Firstly, a layer of compact Bi2MoO6 film covers an electric conducting glass substrate through a magnetron sputtering method; and then, a layer of Bi2MoO6 powder is deposted on the film by using an electrophoretic deposition method, and is annealed at high temperature to form a Bi2MoO6 photo-anode film with high crystallinity. The prepared photo-anode effectively improves the transmission efficiency of current carriers, reduces the compound rate of electroniccavities, and prominently improves the photoelectric conversion efficiency of the photo-anode. The preparation method is low in cost, simple and convenient to operate, and can be widely applied to photoelectric chemical decomposition water systems of multiple electrode films.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemistry, in particular to a Bi with high photoelectric conversion efficiency 2 MoO 6 Photoanode and method for its preparation. Background technique [0002] Photoelectrochemical (PEC) water splitting technology is an environmentally friendly technology. It uses sunlight to split water to produce hydrogen to obtain renewable energy. It is currently the main means to solve environmental and energy problems. In a PEC system, the photoanode is a key component that determines the system performance. Therefore, improving the performance of photoanodes has become one of the most important topics in PEC research, and is the key to realize the large-scale application of photoelectrochemical water splitting. [0003] Bi 2 MoO 6 It is a typical bismuth-based n-type visible light-driven semiconductor with a band gap of about 2.6eV. As the simplest Aurivillius-type structural material, it exhibits...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B1/04C23C28/04
CPCC23C28/04C25B1/04C25B11/051C25B11/077Y02E60/36Y02P20/133
Inventor 范晓星田莉刘京郭强韩宇宋朋王绩伟
Owner LIAONING UNIVERSITY
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