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Copper selenide hollow tubular multi-stage structure material as well as preparation method and application thereof

A structural material, copper selenide technology, applied in electrical components, electrolytic capacitors, capacitors and other directions, can solve the problems of cumbersome synthesis steps, less research on copper selenide, poor stability, etc., and achieve the effect of simple preparation steps

Inactive Publication Date: 2016-04-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since sulfur chemisorption will poison the Pt-based counter electrode, Pt is not effective in catalytic reduction of polysulfide electrolytes.
However, the copper in the traditional copper sulfide / brass sheet counter electrode will continue to be corroded by the polysulfide electrolyte, and its stability is poor, and its limited specific surface area also limits the improvement of its activity.
[0003] Due to its high conductivity and high catalytic activity, copper selenide has high battery performance, but there are few studies on copper selenide at present.
At present, methods for synthesizing copper selenide include solvothermal method, SILAR method, chemical bath and other methods, and the synthesis steps are cumbersome, and the BET surface area of ​​the obtained material is often less than 15 square meters per gram

Method used

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  • Copper selenide hollow tubular multi-stage structure material as well as preparation method and application thereof
  • Copper selenide hollow tubular multi-stage structure material as well as preparation method and application thereof
  • Copper selenide hollow tubular multi-stage structure material as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] a Cu 2-X The preparation method of Se nanocrystalline counter electrode material, its step is as follows:

[0040] First, polish the copper foil with sandpaper, wash the FTO and the copper foil with decontamination powder, then use acetone, 95% ethanol, and secondary deionized water to ultrasonically wash for 20 minutes, and then vacuum dry. At room temperature, soak the copper foil (3.0cm*2.5cm) in a solution containing sodium hydroxide aqueous solution (10M, 8.0mL), ammonium persulfate aqueous solution (1.0M, 4mL), ammonia dilute solution (25%, 4mL), two in a mixture of deionized water (40.0 mL). React for 45 minutes, rinse with secondary water and 95% ethanol in turn, and dry in vacuum. Then, soak it in 0.01 mol / L solution and react for 30 minutes (selenization time). Finally, soak it in 20% ammonia water dilute solution and react for 8 hours. Rinse with secondary water and 95% ethanol in sequence, and dry in vacuum.

[0041] figure 1 is the X-ray diffraction s...

Embodiment 2

[0043] The steps are the same as in Example 1, except that the selenium ion concentration in Example 1 is changed to 0.005 mol / liter. Figure 4 Respectively, the transmission diagram of the product obtained in Example 2, reducing the concentration of the reaction solution, the displacement reaction rate decreases, the reaction is not carried out completely, Cu(OH) 2 Cu grown on the upper end of the rod-like structure 2-X The Se nanosheets are smaller, with a thickness of 3.14–3.57 nm, and their specific surface areas are 15.67 m 2 g -1 .

Embodiment 3

[0045] The steps are the same as in Example 1, except that the selenium ion concentration in Example 1 is changed to 0.02 mol / liter. Figure 5 Respectively, the transmission diagrams of the products obtained in Example 3. However, the morphology of the lower end of the rod-like structure does not change significantly. As the concentration increases, the displacement reaction rate accelerates, and the Cu 2-X The Se nanosheets become significantly larger, and since the reaction rate is greater than the downward migration rate of Se ions, the upper end of the rod-like structure grows larger relative to the lower end. The thickness of the nanosheet is 4.75-6.25nm, and its specific surface area is 41.76m 2 g -1 .

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Abstract

The invention relates to a copper selenide hollow tubular multi-stage structure material as well as a preparation method and application thereof. A normal temperature ion exchange method is adopted for preparing the copper selenide hollow tubular multi-stage structure material which has great specific surface area and is assembled by ultra-thin nanometer sheets. A scraping coating method is used for manufacturing a counter electrode of a quantum dot sensitized solar cell, and the quantum dot sensitized solar cell of a sandwich structure is assembled. The performance of synthesized Cu<2-x>Se is much higher than that of the conventional Cu2S / brass strip and the conventional Pt counter electrode. Compared with the prior art, the method has the advantages that the defects of expensive equipment, large-area deposition difficulty and the like are avoided; the equipment requirement is simple; the material is suitable for industrial large-scale production, and the like. Meanwhile, the method provides an idea capable of being used as the reference for preparing dye sensitized solar cell counter electrodes made of other materials.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and in particular relates to a copper selenide hollow tubular multi-level structure material and a preparation method and application thereof. Background technique [0002] In recent years, with the increasingly prominent energy and environmental problems, the development of clean energy is undoubtedly an effective way to solve these problems. Quantum dot-sensitized solar cells have many unique advantages and are considered to be a potential battery. However, the current photoelectric conversion efficiency is relatively low, which greatly limits the practical application of quantum dot-sensitized solar cells. The counter electrode is an important part of the quantum dot-sensitized solar cell. The electrons flow through the counter electrode and enter the electrolyte to undergo a reduction reaction, forming an overall circulation path. The choice of electrode material plays a cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCH01G9/042
Inventor 王敏宰建陶钱雪峰陈文龙黄守双何青泉李波李晓敏马对刘雪娇刘园园张洋张敏敏
Owner SHANGHAI JIAO TONG UNIV
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