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Nano-cellulose whisker MoS2/graphene composite counter electrode material and preparation method and application thereof

A graphene composite and nanocellulose technology, applied in the field of solar cells, can solve the problems of reduced electron collection and conversion efficiency, high price of platinum electrodes, loss, etc., and achieve the effects of simple and easy operation, low cost and environmental friendliness in the production process

Inactive Publication Date: 2017-10-03
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Pt electrodes have many advantages and excellent performance, the price of platinum electrodes is too expensive, accounting for almost 60% of the entire battery cost
For one-dimensional inorganic nano-semiconductor materials, because electrons are easily trapped and lost at the interface and space when conducting through disordered nanoparticles, the collection and conversion efficiency of electrons is reduced.

Method used

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  • Nano-cellulose whisker MoS2/graphene composite counter electrode material and preparation method and application thereof
  • Nano-cellulose whisker MoS2/graphene composite counter electrode material and preparation method and application thereof
  • Nano-cellulose whisker MoS2/graphene composite counter electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] MoS of this example 2 Nanorod / graphene counter electrode material, which consists of MoS 2 Composition of nanorods, graphene, amorphous carbon, MoS 2 , the mass ratio of graphene and amorphous carbon is 1:0.001:0.2, and the porosity is 0.10 cm 3 / g, the MoS 2 Nanorods with a diameter of 10nm, MoS 2 The average pore size of the nanorods is 10 nm.

[0033] The nanocellulose whisker MoS based on the present embodiment 2 The preparation method of graphene composite counter electrode material is as follows:

[0034] (1) Dissolve one of cotton, wood pulp and bamboo pulp with a mass fraction of 10% in a sulfuric acid solution with a concentration of 30%, the dissolution temperature is 30°C, and the dissolution time is 20 minutes;

[0035] (2) The initial solution of nanocellulose whiskers obtained in step (1) was repeatedly centrifuged and washed to neutrality, then distilled water was added to adjust the mass fraction of whiskers to 0.15%, thiourea solution was added, and...

Embodiment 2

[0043] MoS of this example 2 Nanorod / graphene counter electrode material, which consists of MoS2 nanorods, graphene, amorphous carbon, MoS 2 , the mass ratio of graphene and amorphous carbon is 1:0.013:0.23, and the porosity is 0.27 cm 3 / g, the MoS 2 The diameter of the nanorod is 28nm, MoS 2 The average pore size of the nanorods is 14 nm.

[0044] The nanocellulose whisker MoS based on the present embodiment 2 The preparation method of graphene composite counter electrode material is as follows:

[0045] (1) Dissolve one of cotton, wood pulp and bamboo pulp with a mass fraction of 20% in a sulfuric acid solution with a concentration of 40%, the dissolution temperature is 40°C, and the dissolution time is 30 minutes;

[0046] (2) Repeatedly centrifuge and wash the initial nanocellulose whisker solution obtained in step (1) to neutrality, then add distilled water to adjust the whisker mass fraction to 0.17%, add thiourea solution, and stir ultrasonically for 4 hours to ob...

Embodiment 3

[0053] MoS of this example 2 Nanorod / graphene counter electrode material, which consists of MoS 2 Composition of nanorods, graphene, amorphous carbon, MoS 2 , the mass ratio of graphene and amorphous carbon is 1:0.022:0.3, the porosity is 0.42 cm3 / g, the MoS 2 The diameter of the nanorod is 46nm, MoS 2 The average pore size of the nanorods is 19 nm.

[0054] The nanocellulose whisker MoS based on the present embodiment 2 The preparation method of graphene composite counter electrode material is as follows:

[0055] (1) Dissolve one of cotton, wood pulp and bamboo pulp with a mass fraction of 30% in a sulfuric acid solution with a concentration of 50%, the dissolution temperature is 50°C, and the dissolution time is 40 minutes;

[0056] (2) Repeatedly centrifuge and wash the initial solution of nanocellulose whiskers obtained in step (1) to neutrality, then add distilled water to adjust the mass fraction of whiskers to 0.19%, add thiourea solution, and stir ultrasonically ...

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Abstract

The invention discloses a preparation method of a nano-cellulose whisker MoS2 / graphene composite electrode material, which comprises the following specific steps of treating one of cotton, wood pulp and bamboo pulp through sulfuric acid to obtain nano cellulose whisker, mixing the whicker with thiourea and sodium molybdate, and placing the mixture in a hydrothermal reaction kettle for hydrothermal reaction to obtain the MoS2 nanorods, then compounding the MoS2 nanorods with the graphene oxide, and carrying out high temperature carbonization of the compound in a nitrogen atmosphere to obtain a MoS2 nanorod / graphene composite material . The MoS2 nanorod / graphene composite material is directly applied to the counter electrode of the dye-sensitized solar cell. The dye-sensitized solar cell counter electrode material prepared based on the nano-cellulose whisker MoS2 nano,rod / graphene has a hollow nano rod structure and a great specific surface area, is beneficial to the permeation of electrolyte and the transmission of electrons, has more catalytic activity sites for the redox reaction. The method has the advantages of simple preparation process, low cost, environment friendliness and wide application prospect.

Description

technical field [0001] The invention belongs to the field of solar cells, in particular to a nano-cellulose-based whisker MoS 2 And graphene electrode materials and their preparation methods and applications. Background technique [0002] With the depletion of fossil energy, energy issues and environmental issues have become the bottleneck of global economic development. Some renewable energy sources such as solar energy, wind energy, geothermal energy, and ocean energy are considered by most countries to be the most ideal substitutes for fossil energy. Solar energy will surely become one of the most promising clean energy for large-scale application in the new century due to its advantages of easy acquisition, safety, and no pollution. [0003] So far, solar cells are mainly divided into the following categories: silicon-based solar cells, polymer multilayer modified electrode solar cells, multi-element compound semiconductor thin-film solar cells and dye-sensitized nanoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20
CPCY02E10/542H01G9/2022
Inventor 何建新王利丹邵伟力楚艳艳赵树元孙显强卢凯佑晓露南楠胡宝继周玉嫚齐琨崔世忠
Owner ZHONGYUAN ENGINEERING COLLEGE
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