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Single atom pt counter electrode and its preparation method and application

An atomic and electrode technology, applied in the field of single-atom Pt counter electrode and its preparation, can solve the problems of decreased stability, inability to significantly reduce the amount of Pt used, and increase of metal surface free energy.

Active Publication Date: 2021-08-20
DONGGUAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, more and more studies have shown that when the particle size of Pt is reduced to a certain extent, its stability will be greatly reduced.
For example, when the size of Pt particles is reduced to nanometer or even sub-nanometer size, the metal surface free energy increases significantly, easily forming aggregates and reducing the catalytic activity.
In addition, the preparation of Pt into nanoparticles does not significantly reduce the amount of Pt used, because the prepared counter electrode still needs more mass of Pt.

Method used

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  • Single atom pt counter electrode and its preparation method and application
  • Single atom pt counter electrode and its preparation method and application
  • Single atom pt counter electrode and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0057] 1. Single-atom Pt catalytic material Pt 1 / FeO x preparation of

[0058] First, two single-atom catalysts with different Pt contents were prepared by co-precipitation method (refer to "Nature Chemistry", 2011, 3, p634–641 for details) (the mass percentages of Pt in the two samples were 0.08% and 1.70%, respectively). The preparation of the sample is carried out in aqueous solution. The precursors include chloroplatinic acid solution, ferric nitrate solution and sodium carbonate solution. The pH of the reaction system is controlled at about 8.0. When preparing samples with a Pt content of 0.08%, the concentration of chloroplatinic acid was 2.12×10 -2 M, the concentration of ferric nitrate is 1.0M, the concentration of sodium carbonate solution is 1.0M, and the reaction temperature is 50°C; when preparing a sample with a Pt content of 1.70%, the concentration of chloroplatinic acid is 0.36 M, the concentration of ferric nitrate is 1.0M, and the concentration of sodium c...

Embodiment 2

[0069] The opposite electrode prepared by the sample with a Pt mass percentage content of 0.08% in Example 1 is assembled into a complete DSCs device, and the photoelectric conversion performance of the device is tested

[0070] (1) draw a regular square on the counter electrode prepared by the sample whose Pt mass percentage content is 0.08% in embodiment 1, and the area of ​​the square is consistent with the active area of ​​the photoanode; on the diagonal apex of the square Drill a small hole each with a diameter of about 0.5mm.

[0071] (2) Take the dye-sensitized photoanode, cover it completely with sarin film outside the active area of ​​the photoanode, and then cover the counter electrode and heat seal it to ensure that the photoanode and the counter electrode are tightly connected.

[0072] (3) Connect the air pump with an elastic plastic tube. One end of the plastic tube is close to the small hole on the counter electrode. The electrolyte is perfused from another sma...

Embodiment 3

[0076] 1. Preparation of Pt with a Pt content of 2.32% 1 / FeO x

[0077] The method used is the co-precipitation method (references Nature Chemistry, 2011, 3, 634-641). The preparation of the samples was carried out in aqueous solution, the concentration of chloroplatinic acid was 4.09×10 -2 M, the concentration of ferric nitrate is 1.0M, the concentration of sodium carbonate solution is 1.0M, and the reaction temperature is 50°C. After the precipitation reaction has completely occurred (this process takes about 1h), the sample is centrifuged, dried at 60°C for 5h, and then sintered in a muffle furnace at 400°C for 5h; before preparing the counter electrode, the sintered sample is reduced by hydrogen, The specific process is to introduce a mixed gas containing 10% hydrogen at 200°C (the other component in the mixed gas is He gas, which acts as a carrier gas) for 0.5h reduction

[0078] The prepared Pt content was 2.32% Pt 1 / FeO x The high-resolution spherical aberration...

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Abstract

The application discloses a single-atom Pt counter electrode and its preparation method and application. The raw materials of the counter electrode include a conductive carbon material and a single-atom Pt catalyst. The single-atom Pt catalyst is mixed with the conductive carbon material, and a certain amount of organic solvent is added. After ball milling, the dispersed slurry is formed; the above-mentioned dispersed slurry is sprayed on a clean conductive substrate, and the counter electrode is obtained after heating. The single-atom Pt counter electrode of the present invention can greatly reduce the amount of Pt used, thereby greatly reducing the cost of the counter electrode, and is conducive to promoting the industrialization of DSCs.

Description

technical field [0001] This application relates to the field of new materials and new energy devices, in particular, to a single-atom Pt counter electrode and its preparation method and application Background technique [0002] Dye-sensitized solar cells (DSCs) is a representative third-generation photovoltaic technology, and it is also the only known solar cell using liquid electrolyte. DSCs usually consist of a photoanode, dye, electrolyte, and counter electrode. The effective components in the DSCs electrolyte are redox couples, which play the role of charge transfer. Among them, the most commonly used couple is iodine couple, which is composed of iodide ion / iodide triple ion (I— / I3—). After the iodine pair transfers electrons to the excited dye molecules, the iodide ions become iodide triions. As the most important step in completing the charge transfer, iodide triion needs to be reduced at the counter electrode of DSCs, and this reaction is commonly known as iodine re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/20
Inventor 史彦涛李燕茜
Owner DONGGUAN UNIV OF TECH
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