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Electrochemical preparation method of MoS<2>/graphene composite counter electrode

A graphene composite and electrochemical technology, which is applied in the direction of electrolytic capacitors, circuits, capacitors, etc., can solve the problems of cumbersome preparation process, long reaction time, and additional steps, and achieve the effects of simplified steps, shortened reaction time, and simple method

Active Publication Date: 2016-03-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously related researchers prepared MoS 2 / Graphene composite counter electrode has methods such as hydrothermal method and ball milling method, but their reaction time is relatively long, some methods involve high temperature treatment, and the preparation process is cumbersome
In addition, they all prepared MoS first 2 / graphene composites, the material is then attached to the substrate surface using spin-coating, drop-coating, or scalpel methods, adding an additional step

Method used

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  • Electrochemical preparation method of MoS&lt;2&gt;/graphene composite counter electrode
  • Electrochemical preparation method of MoS&lt;2&gt;/graphene composite counter electrode
  • Electrochemical preparation method of MoS&lt;2&gt;/graphene composite counter electrode

Examples

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Effect test

Embodiment 1

[0022] (1) prepare graphene oxide / lithium perchlorate mixed aqueous solution, ultrasonically dissolve; wherein the concentration of graphene oxide is 2mg / mL, the concentration of lithium perchlorate is 0.02g / mL;

[0023] (2) Using an electrochemical workstation, the FTO glass substrate is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode. In the mixed aqueous solution of graphene oxide / lithium perchlorate, electrochemical deposition And reduce graphene oxide to FTO glass substrate to form graphene film; electrochemical deposition adopts constant potential deposition, the potential is -1.5V, and the deposition time is 2min;

[0024] (3) Prepare ammonium tetrathiomolybdate / potassium chloride mixed aqueous solution, and ultrasonically dissolve; wherein the concentration of ammonium tetrathiomolybdate is 0.2 mg / mL, and the concentration of potassium chloride is 5 mg / mL.

[...

Embodiment 2

[0028] (1) Prepare a mixed aqueous solution of graphene oxide / lithium perchlorate, and ultrasonically dissolve; wherein the concentration of graphene oxide is 3 mg / mL, and the concentration of lithium perchlorate is 0.05 g / mL.

[0029] (2) Using an electrochemical workstation, the FTO glass substrate is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode. In the mixed aqueous solution of graphene oxide / lithium perchlorate, electrochemical deposition And reduce graphene oxide to FTO glass substrate to form graphene film; electrochemical deposition adopts constant potential deposition, the potential is -1.0V, and the deposition time is 5min.

[0030] (3) Prepare ammonium tetrathiomolybdate / potassium chloride mixed aqueous solution, and ultrasonically dissolve; wherein the concentration of ammonium tetrathiomolybdate is 0.5 mg / mL, and the concentration of potassium chloride i...

Embodiment 3

[0035](1) Prepare a mixed aqueous solution of graphene oxide / lithium perchlorate, and ultrasonically dissolve; wherein the concentration of graphene oxide is 5 mg / mL, and the concentration of lithium perchlorate is 0.1 g / mL.

[0036] (2) Using an electrochemical workstation, the FTO glass substrate is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode. In the mixed aqueous solution of graphene oxide / lithium perchlorate, electrochemical deposition And reduce graphene oxide to FTO glass substrate to form graphene film; electrochemical deposition adopts constant potential deposition, the potential is -1.2V, and the deposition time is 2min.

[0037] (3) Prepare ammonium tetrathiomolybdate / potassium chloride mixed aqueous solution, and ultrasonically dissolve; wherein the concentration of ammonium tetrathiomolybdate is 0.8 mg / mL, and the concentration of potassium chloride is ...

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Abstract

The invention discloses an electrochemical preparation method of an MoS<2> / graphene composite counter electrode. A three-electrode electrochemical deposition system is adopted firstly, a graphene oxide / lithium perchlorate mixed aqueous solution is taken as an electrolyte, and a graphene oxide thin film is directly formed on FTO conductive glass in an electro-deposition manner and forms a graphene thin film through electrochemical reduction at the same time; and the graphene thin film is taken as a substrate then, MoS<2> is continue to formed in an ammonium tetrathiomolybdate / potassium chloride aqueous solution in an electro-deposition manner and an MoS<2> / graphene composite thin film is obtained. The MoS<2> / graphene composite thin film prepared through the method can be directly used as a counter electrode of a dye-sensitized solar cell, and any postprocessing procedure does not needed.

Description

technical field [0001] The present invention relates to a kind of MoS 2 The invention relates to an electrochemical preparation method of a graphene / graphene composite counter electrode, which belongs to the preparation technology of nano functional thin film materials. Background technique [0002] In recent years, dye-sensitized solar cells have been widely studied as a new energy source, and the counter electrode, as an important part of it, has attracted the attention of researchers. At present, the most common counter electrode material is platinum electrode. However, as we all know, platinum is very rare in nature and expensive. Therefore, it is necessary to find low-cost and high-efficiency materials to replace platinum as the counter electrode material. [0003] Recently, MoS 2 It has been proved to have good conversion efficiency when used as a counter electrode. In order to further improve the catalytic performance of the material, the researchers want to achiev...

Claims

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Application Information

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IPC IPC(8): H01G9/20
CPCH01G9/2022Y02E10/542
Inventor 徐峰李胜利倪亚茹朱重阳闵辉华孙立涛
Owner SOUTHEAST UNIV
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