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Method for preparing copper tungstate/nickel phosphate photoanode film with visible light response

A technology of nickel phosphate light and anode film, applied in electrodes, liquid chemical plating, coatings, etc., can solve the problems of inability to meet practical application requirements, slow interface charge transfer rate, fast carrier recombination speed, etc. Copper tungstate photoelectric conversion efficiency, accelerating hole transfer, and increasing carrier lifetime

Active Publication Date: 2019-06-11
TAIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, copper tungstate itself has problems such as fast carrier recombination speed, short charge transfer distance, and slow interface charge transfer rate, resulting in low efficiency of converting solar energy into hydrogen energy, which cannot meet the needs of practical applications.

Method used

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  • Method for preparing copper tungstate/nickel phosphate photoanode film with visible light response
  • Method for preparing copper tungstate/nickel phosphate photoanode film with visible light response
  • Method for preparing copper tungstate/nickel phosphate photoanode film with visible light response

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A preparation method of a copper tungstate / nickel phosphate photoanode film with visible light response, comprising the following steps:

[0016] 1) At room temperature, add 0.1237g of sodium tungstate and 0.1172g of ammonium oxalate into 15ml of deionized aqueous solution, stir and dissolve; then, slowly drop 5ml of hydrochloric acid with a concentration of 3mol / L into the sodium tungstate solution to obtain White emulsion; mix ammonium oxalate solution and sodium tungstate solution, stir for 30 minutes, the solution becomes clear, pour the solution into a hydrothermal reaction kettle, insert FTO conductive glass, heat at 160°C for 4 hours, WO 3 Grow on the surface of FTO glass, wash with water, and dry in air;

[0017] 2) Dissolve 0.2g of copper nitrate in 5ml of acetic acid solution, take 100μL of the solution and add it dropwise to WO 3 The surface of the thin film electrode was dried at room temperature, calcined in a muffle furnace at 550°C for 2 hours, soaked in...

Embodiment 2

[0021] A method for preparing a copper tungstate / nickel phosphate photoanode film with visible light response. The experimental steps are the same as in Example 1. The hydrothermal temperature is changed to 140°C, the hydrothermal time is set to 6h, and copper ions are repeatedly added dropwise for 3 times, so that Tungsten trioxide is completely converted into copper tungstate; add 0.01g of nickel chloride to 150ml of potassium phosphate solution with a concentration of 0.1mol / L to prepare nickel phosphate precipitation, and drop 20μL of nickel phosphate solid dispersion onto the surface of the copper tungstate electrode. Dry at 120°C to obtain a nickel phosphate-modified copper tungstate film electrode.

[0022] figure 2 The ultraviolet-visible diffuse reflectance spectra of copper tungstate film electrodes before and after nickel phosphate modification are given. It can be seen that nickel phosphate modification will not change the band edge absorption and band gap value o...

Embodiment 3

[0024] A method for preparing a copper tungstate / nickel phosphate photoanode film with visible light response. The experimental steps are the same as in Example 1. The hydrothermal temperature is changed to 130°C, the hydrothermal time is set to 5h, and copper ions are added dropwise for 3 times; 0.02 Add 1 g of nickel chloride to 100ml of potassium phosphate solution with a concentration of 0.1mol / L to prepare nickel phosphate precipitation, add dropwise 30 μL of nickel phosphate solid dispersion to the surface of copper tungstate electrode, and dry at 100°C to obtain nickel phosphate-modified tungstic acid Copper film electrodes.

[0025] image 3 The scanning electron microscope images of tungsten trioxide and copper tungstate film electrodes are given. It can be seen that the morphology of hydrothermally synthesized tungsten trioxide is plate-like. These plate-like nanostructures grow vertically on the surface of FTO conductive glass, which can effectively increase the ele...

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Abstract

The invention relates to a method for preparing a copper tungstate / nickel phosphate photoanode film with visible light response, and belongs to the technical field of photoelectric catalysis. A composite electrode comprises a copper tungstate thin film electrode, and the surface of the copper tungstate thin film electrode is loaded with uniformly distributed nickel phosphate nanoparticles. The composite electrode can prolong the life of a copper tungstate photo-induced carrier and further improve the photocatalytic water decomposition performance, thereby effectively solving the problem of lowphotoelectrocatalytic efficiency of copper tungstate. The preparation method of the electrode mainly comprises the following steps: firstly, taking sodium tungstate and ammonium oxalate as raw materials to conduct hydrothermal synthesis of a tungsten trioxide film electrode; secondly, adding copper ions dropwise to the surface of the tungsten trioxide, and conducting high-temperature conversion to obtain a plate-shaped copper tungstate electrode; and finally, dropwise adding nickel phosphate nanoparticles onto the surface of the copper tungstate electrode and conducting drying, so as to prepare a copper tungstate photoanode modified by nickel phosphate. The preparation process is simple in operation, low in cost and obvious in modification effect, and is expected to realize large-scale commercial application.

Description

technical field [0001] The invention relates to a preparation method of a copper tungstate / nickel phosphate photoanode film with visible light response, which belongs to the field of photoelectric catalysis technology. A method for preparing a permanent copper tungstate / nickel phosphate photoelectrode thin film material. Background technique [0002] Energy shortage is the most serious problem facing mankind in the 21st century, and the development of clean new energy that can replace fossil energy has become a key research direction for scientists from all over the world. Solar energy is an important renewable clean energy, inexhaustible and inexhaustible. Using semiconductor photoelectrochemical technology to split water into hydrogen and oxygen can directly convert solar energy into storable clean chemical energy, which has attractive application prospects. The development of high-activity and high-stability photoelectrode materials is the key to realize high-efficiency...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04C23C18/12
CPCY02E60/36
Inventor 熊贤强范利亚武承林
Owner TAIZHOU UNIV
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