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Method for one-step hydro-thermal synthesis of graphene-SnS2 composite counter electrode material

An electrode material, hydrothermal synthesis technology, applied in circuits, capacitors, photovoltaic power generation, etc., can solve the problem of low conductivity of two-dimensional sulfide, achieve high catalytic activity and stability, simple preparation method, and low price.

Inactive Publication Date: 2016-08-17
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of two-dimensional sulfide is low, and the conductivity of the counter electrode can be greatly improved by forming a complex with a conductive material.

Method used

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  • Method for one-step hydro-thermal synthesis of graphene-SnS2 composite counter electrode material
  • Method for one-step hydro-thermal synthesis of graphene-SnS2 composite counter electrode material
  • Method for one-step hydro-thermal synthesis of graphene-SnS2 composite counter electrode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 5mmol of SnCl 4 ·5H 2 O and 10 mmol of thiourea were added to 80 mL of deionized water, stirred magnetically for 30 minutes, and the resulting homogeneous solution was transferred to a 100 mL reaction kettle, and subjected to hydrothermal reaction at 160° C. for 12 hours. After natural cooling, deionized water and and After fully washing with ethanol and vacuum drying at 60 °C for 24 hours, the hexagonal sheet-like SnS 2 Counter electrode material ( figure 1 , figure 2 ). The material is mixed with PVDF binder and ethanol to make a mixed slurry, which is scraped on the conductive glass to form a counter electrode, and assembled with a dye-sensitized photoanode and iodine electrolyte to form a dye-sensitized solar cell. The measured photovoltaic efficiency is 3.4 %( image 3 ).

Embodiment 2

[0019] 30 mg GO was ultrasonically dispersed into 80 mL deionized water to form a GO aqueous solution, and then 5 mmol of SnCl 4 ·5H 2 O and 20 mmol of thiourea were added to the above GO aqueous solution, magnetically stirred for 30 minutes to form a homogeneous solution, and the formed homogeneous solution was transferred to a 100mL reaction kettle, and hydrothermally reacted at 160°C for 24 hours. After natural cooling, deionized After fully washing with water and ethanol and vacuum drying at 60°C for 24 hours, the graphene-SnS 2 Composite counter electrode material (marked as GS2) ( figure 2 ). The composite counter electrode material is mixed with PVDF binder and ethanol to make a mixed slurry, which is scraped on conductive glass to form a counter electrode, and assembled with N719 dye-sensitized photoanode and iodine electrolyte to form a dye-sensitized solar cell. The efficiency is 7.2%.

Embodiment 3

[0021] 60 mg GO was ultrasonically dispersed into 80 mL deionized water to form a GO aqueous solution, and then 5 mmol of SnCl 4 ·5H 2 O and 20 mmol of thiourea were added to the above GO aqueous solution, magnetically stirred for 30 minutes to form a homogeneous solution, and the formed homogeneous solution was transferred to a 100mL reactor, and hydrothermally reacted at 120°C for 12 hours. After natural cooling, deionized After fully washing with water and ethanol and vacuum drying at 60°C for 24 hours, the graphene-SnS 2 Composite counter electrode material (marked as GS3) ( figure 2 ). The composite counter electrode material is mixed with PVDF binder and ethanol to make a mixed slurry, which is scraped on conductive glass to form a counter electrode, and assembled with N719 dye-sensitized photoanode and iodine electrolyte to form a dye-sensitized solar cell. The efficiency is 6.6%.

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Abstract

The invention discloses a method for one-step hydro-thermal synthesis of a graphene-SnS2 composite counter electrode material. The method comprises the following specific steps: adding graphene oxide to deionized water and carrying out uniform ultrasonic dispersion; adding stannic chloride pentahydrate and thiourea or sulfamide thiosulfate to the solution, stirring the solution to form a uniform solution and transferring the formed uniform solution to a hydrothermal reaction kettle for hydrothermal reaction at 120-180 DEG C for 1-24 hours; naturally cooling the product, and fully washing the product with deionized water and ethanol in sequence; and drying the product in a vacuum drying oven at 60 DEG C for 24 hours to prepare the graphene-SnS2 composite counter electrode material. The used raw materials are common reagents in a laboratory, so that the price is low; the preparation method is simple; the operation is simple and convenient; the prepared graphene-SnS2 compound has relatively high charge transfer ability and good catalytic activity and is applied to a counter electrode of a dye-sensitized photovoltaic cell; and the photovoltaic efficiency can reach 7.9% and is superior to that (7.0%) of a Pt-based cell under the same condition.

Description

technical field [0001] The invention belongs to the technical field of synthesis of dye-sensitized photovoltaic cell electrode materials, in particular to a one-step hydrothermal synthesis of graphene-SnS 2 A method for compounding counter electrode materials. Background technique [0002] Energy and environmental issues are one of the issues of general concern in the current society. Efficient and sustainable green energy is the current and future focus of people's development in the energy field. Solar energy has attracted extensive attention for its abundant resources, environmental friendliness and sustainability. Dye-sensitized solar cells are an important class of photovoltaic devices, which have great development potential due to their high performance and low cost. Dye-sensitized photovoltaic cells include three parts: a sensitized photoanode, a counter electrode and an electrolyte. After receiving incident light, the sensitizing dye on the photoanode injects photo...

Claims

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Application Information

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IPC IPC(8): H01G9/20H01G9/042
CPCY02E10/542H01G9/2022H01G9/2045
Inventor 高志永王兰武大鹏常玖利徐芳蒋凯
Owner HENAN NORMAL UNIV
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