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A kind of preparation method of self-supporting photoanode

A self-supporting, photoanode technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, etc., can solve problems such as photocorrosion, fast recombination rate of electrons and holes, and limited photoelectric conversion efficiency of cadmium sulfide photoanodes. Achieve the effect of improving stability and reducing photocorrosion

Active Publication Date: 2018-07-06
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently two problems that cannot be ignored in cadmium sulfide
First, the recombination rate of electrons and holes generated by photoexcitation is too fast, which greatly limits the photoelectric conversion efficiency of cadmium sulfide photoanodes.
Second, due to the presence of sulfur vacancies in cadmium sulfide itself, the holes generated by photoexcitation directly react with cadmium sulfide itself to cause photocorrosion.
So far, direct growth of cadmium sulfide / nickel sulfide / nickel disulfide nanoparticle composites on nickel foam by a one-step hydrothermal method, and its application to photoanodes for water splitting has not been reported.

Method used

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  • A kind of preparation method of self-supporting photoanode
  • A kind of preparation method of self-supporting photoanode
  • A kind of preparation method of self-supporting photoanode

Examples

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Effect test

Embodiment 1

[0017] Example 1: This example prepares a three-dimensional nickel sulfide / nickel disulfide / cadmium sulfide nanocomposite material, which specifically includes the following steps:

[0018] (1) 0.153g of cadmium acetate powder, 0.168g of thiourea powder, and 0.036g of CTAB were uniformly dispersed in 20ml of aqueous solution by ultrasound.

[0019] (2) Add 167 μl of hydrochloric acid (12M) dropwise to the solution obtained in step (1), and sonicate for ten minutes to form a mixed solution.

[0020] (3) Foam nickel (1*3cm 2 ) and the above-mentioned mixed solution were put into the reaction kettle, and reacted at 180 degrees Celsius for 5 hours, and the nickel foam turned black, and the composite material was obtained.

[0021] figure 1 For the scanning electron micrograph (SEM) of the cadmium sulfide / nickel sulfide / nickel disulfide nanocomposite prepared by the present invention, as can be seen from the figure, this cadmium sulfide / nickel sulfide / nickel disulfide is based on...

Embodiment 2

[0022] Example 2: The nickel foam-based photoanode obtained in Example 1 was directly used for photoelectrochemical oxygen production, the test solution was 1M potassium hydroxide, and the light was visible light (>420nm). The prepared electrode was used as the working electrode, the Ag / AgCl electrode was used as the reference electrode, and the Pt sheet was used as the counter electrode to form a three-electrode system. Before doing the electrochemical test, feed saturated nitrogen to reach saturation, remove the polarization curve (Polarizationcurves) of the three-dimensional cadmium sulfide / nickel sulfide / nickel disulfide nanocomposite prepared by the present invention, as can be seen from the figure when the voltage is At 1V, the current density reaches ~3mA / cm 2 . Figure 4 The stability test curve (Durability test) of the three-dimensional cadmium sulfide / nickel sulfide / nickel disulfide prepared for the present invention, as can be seen from the figure, after 2000s of c...

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Abstract

The invention discloses a method of preparing self-supporting photo-anode based on cadmium sulfide / nickel sulfide / nickelic sulfide ternary composites and is applied to photoelectrochemical decomposition of oxygen-making catalyst in water. The invention synthetizes the composite of cadmium sulfide / nickel sulfide / nickelic sulfide mainly by means of one-step hydrothermal method, can be used directly as a photo-anode after ethanol cleaning and nitrogen drying. The invention is mainly applied to photoelectrochemical water decomposition. A linear sweep voltammetry (polarization curve) is adopted to test the degree of catalytic activity of the composite of cadmium sulfide / nickel sulfide / nickelic sulfide. A current and voltage curve is used to test the stability of the composite of cadmium sulfide / nickel sulfide / nickelic sulfide in the light. According to the invention, the synergistic effect of a cadmium sulfide, two sulfides of nickel in cadmium sulfide / nickel sulfide / nickel trioxide is fully utilized and the stability of cadmium sulfide in photoelectrochemical decomposition water is improved, and the invention facilitates the continuous decomposition of water by the catalyst after a long period of time.

Description

technical field [0001] The invention belongs to the field of preparation and application of clean and sustainable new energy sources, in particular to a cadmium sulfide / nickel sulfide / nickel disulfide nanoparticle composite material based on a nickel foam substrate and its application. Background technique [0002] With the rapid development of the world economy, the excessive consumption of traditional energy such as oil and natural gas and the environmental problems caused by the use of traditional energy restrict the rapid and effective further development of today's society. Sunlight is an inexhaustible natural energy source, so effectively converting sunlight into chemical energy has become a top priority. Since A and B discovered that titanium dioxide can effectively split water under light conditions in 1979, more and more scientists have devoted themselves to discovering photoelectrochemical water splitting catalysts and modifying them to have higher photoelectric co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/86
CPCY02E60/13
Inventor 崔小强张丹彤刘璐璐
Owner JILIN UNIV
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