Graphene-CoS nanosheet composite counter electrode and preparation method thereof

A graphene and nanosheet technology, applied in circuits, capacitors, electrolytic capacitors, etc., can solve problems such as adverse effects on the structure and performance of thin film materials, it is difficult to obtain a rich morphology, a composite structure of electrical and catalytic properties, and the existence of the environment. Achieve the effect of improving photoelectric conversion efficiency, multiple electrochemical catalytic active sites, and enhancing catalytic properties

Inactive Publication Date: 2014-08-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because most of the currently prepared graphene-CoS composite counter electrodes are prepared by chemical bath deposition of CoS nanoparticles, which is difficult to obtain a composite structure with rich morphology and both electrical and catalytic properties.
Other methods for preparing graphene-CoS composite counter electrodes are mainly through the scalpel method and screen printing method, which inevitably involves the use of additives such as organic solvents, and requires the introduction of a high-temperature post-treatment process to remove the additives, which will inevitably affect the structure and performance of the film material. adverse impacts, as well as environmental and safety hazards

Method used

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  • Graphene-CoS nanosheet composite counter electrode and preparation method thereof
  • Graphene-CoS nanosheet composite counter electrode and preparation method thereof
  • Graphene-CoS nanosheet composite counter electrode and preparation method thereof

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Effect test

Embodiment 1

[0032] (1) preparation concentration is the GO ethanol solution of 10mg / L, deposits GO thin film on ITO conductive glass substrate by spraying process;

[0033] (2) preparation concentration is the CoCl of 5mM and the thiourea mixed aqueous solution that concentration is 15mM is electrolytic solution, and gained solution is denoted as A solution;

[0034] (3) Using solution A as the electrolyte, a three-electrode electrodeposition system was used to deposit CoS nanosheet arrays on the GO film at a constant potential; the temperature of the electrolyte was 25°C, the pH was 7, the deposition time was 5 min, and the deposition potential was -0.8V ;

[0035] (4) While the CoS nanosheet array is deposited at a constant potential, the graphene oxide is electrochemically reduced to graphene to form a graphene-CoS nanosheet composite film. After repeated washing with deionized water, place it in an oven and dry it for later use. .

Embodiment 2

[0037] (1) preparation concentration is the GO ethanol solution of 20mg / L, deposits GO thin film on ITO conductive glass substrate by spraying process;

[0038] (2) preparation concentration is the CoCl of 10mM and the thiourea mixed aqueous solution that concentration is 50mM is electrolytic solution, and gained solution is denoted as A solution;

[0039] (3) Using solution A as the electrolyte, a three-electrode electrodeposition system was used to deposit CoS nanosheet arrays on the GO film at a constant potential; the temperature of the electrolyte was 40 ° C, the pH was 10, the deposition time was 30 min, and the deposition potential was -0.8 V ;

[0040] (4) While the CoS nanosheet array is deposited at a constant potential, the graphene oxide is electrochemically reduced to graphene to form a graphene-CoS nanosheet composite film. After repeated washing with deionized water, place it in an oven and dry it for later use. .

Embodiment 3

[0042] (1) preparation concentration is the GO ethanol solution of 30mg / L, deposits GO thin film on ITO conductive glass substrate by spraying process;

[0043] (2) preparation concentration is the CoSO of 15mM and the thioacetamide mixed aqueous solution that concentration is 150mM is electrolytic solution, and the gained solution is denoted as A solution;

[0044] (3) Using solution A as the electrolyte, a three-electrode electrodeposition system was used to deposit CoS nanosheet arrays on the GO film at a constant potential; the temperature of the electrolyte was 50 ° C, the pH was 7, the deposition time was 20 min, and the deposition potential was -0.8 V ;

[0045] (4) While the CoS nanosheet array is deposited at a constant potential, the graphene oxide is electrochemically reduced to graphene to form a graphene-CoS nanosheet composite film. After repeated washing with deionized water, place it in an oven and dry it for later use. .

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Abstract

The invention discloses a graphene-CoS nanosheet composite counter electrode and a preparation method thereof. The graphene-CoS nanosheet composite counter electrode is composed of a graphene thin film and a CoS nanosheet array. The graphene thin film is obtained by the fact that an oxidized graphene thin film is deposited on an ITO conductive glass substrate through a spraying technology, and then electrochemical reduction is conducted. The CoS nanosheet array is directly deposited and grown on the surface of the oxidized graphene thin film in an electrochemical mode. The graphene-CoS nanosheet composite counter electrode is simple in preparation method, and has the advantages of low temperature operation, quick and large-area preparation and environment friendliness. Meanwhile, the prepared composite counter electrode has the advantages of being high in electron mobility, small in interfacial charge transfer resistance and high in catalytic activity, and the photoelectric conversion efficiency of a dye-sensitized solar cell is effectively improved.

Description

technical field [0001] The invention relates to a graphene-CoS nanosheet composite counter electrode for a dye-sensitized solar cell and a preparation method thereof, belonging to the graphene-CoS nanocomposite film technology. Background technique [0002] Traditional dye-sensitized solar cells mainly consist of a dye-sensitized nanostructured photoanode, an ionic electrolyte, and a Pt counter electrode. Among them, the role of the counter electrode is to transfer electrons from the external circuit to the redox pair I3- to I-, and play an important catalytic role in the reduction process of I3- to I-. However, since Pt materials are noble metals and Pt is less abundant on earth, it is of great significance to develop functional materials with similar electrochemical properties to Pt. Among them, transition metal sulfides CoS have been widely studied as counter electrode materials for dye-sensitized solar cells due to their rich microstructures, such as nanoparticles, one-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
Inventor 徐峰朱重阳王豪闵辉华董辉孙立涛翟旺旺孙博闻谭爽刘欣博李潇
Owner SOUTHEAST UNIV
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