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Cobalt ion liquid redox couple and preparation and application thereof

A technology of ionic liquids and cobalt ions, which is applied in the field of dye-sensitized solar cells, can solve the problems of poor thermal stability, difficult packaging of batteries, and easy volatilization, and achieves broad application prospects, easy leakage, and industrialization.

Inactive Publication Date: 2012-07-18
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has the advantages of fast electron exchange and slow recombination with photogenerated electrons, it also has many disadvantages: (1) I 2 The single substance has a certain vapor pressure, which has a great influence on the stability of the battery and has high requirements for the packaging technology of the battery; (2)I 3 - / I - Redox pairs have a certain absorption of visible light; (3) for most metals (such as Ag, Cu, Al and other common metals), I 3 - It shows strong corrosion, and for large-area dye-sensitized solar cells, it is necessary to use silver conductive grids to reduce the resistance of the battery and improve the current collection efficiency, so the protection of silver grids faces technical barriers
[0005] However, the electrolyte system selected by the above-mentioned technical scheme still uses nitriles as solvent, which has many disadvantages such as easy volatilization, difficult packaging of batteries, and poor thermal stability.

Method used

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  • Cobalt ion liquid redox couple and preparation and application thereof
  • Cobalt ion liquid redox couple and preparation and application thereof
  • Cobalt ion liquid redox couple and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment one: see figure 1 As shown, the preparation of compound 7a specifically includes the following steps:

[0032] (1) Put 4,4'-dimethyl-2,2'-bipyridine (5g, 27.1mmol) into a 250mL three-necked flask, add concentrated sulfuric acid (150mL) into it, and slowly heat to 60°C with magnetic stirring, At this time, potassium dichromate (32g, 110.8mmol) was slowly added in, and the reaction temperature was kept at 70-80°C during the reaction. After the reaction, a dark green solution was obtained after cooling, and then the dark green solution was poured into 600mL of ice water solution, and filtered to obtain Wash the yellow solid twice with water, reflux the obtained yellow solid in 50% concentrated nitric acid (150mL) for 4h, cool, pour the reaction solution into ice water (800mL) and filter to obtain a white solid, wash twice with water , and weighed dry to obtain compound 2 (6.4g), yield 97%. The melting point is greater than 300°C.

[0033] Compound 2 was analy...

Embodiment 2

[0044] Embodiment two: see figure 1 And Example 1, the preparation of compound 7b specifically includes the following steps:

[0045] (1) Weighing Compound 5 (1.0g, 2.90mmol) and 1-ethylimidazole (0.59g, 6.17mmol) were dissolved in methanol, refluxed for 3 days, and the detection reaction was completely rotary evaporated to remove methanol, washed with ether to obtain Product 1.3g; Gained product is analyzed, and data is as follows: 1 H NMR (CDCl 3 , 400Hz): δ(ppm): hydrogen on the aliphatic chain 1.27 (6H, t); 4.15 (4H, q); 5.94 (4H, s); hydrogen on the imidazole ring 10.18 (2H, d); 7.75-7.76 (4H, d); hydrogens on the pyridine ring 7.41 (2H, dd); 8.91 (2H, s); 8.78 (2H, d). The above results prove that the obtained compound is compound 6b.

[0046] (2) Weigh compound 6b (1.0g, 2.67mmol) and dissolve it completely in methanol, CoCl 3 .6H 2 O (0.16g, 0.066mmol) was dissolved in 5mL of water, slowly added to the methanol solution of compound 6b, stirred for 1 hour, and the...

Embodiment 3

[0047] Embodiment three: see figure 1 And Example 1, the preparation of compound 7c specifically includes the following steps:

[0048] (1) Weighing Compound 5 (1.0g, 2.90mmol) and 1-butylimidazole (0.76g, 6.17mmol) were dissolved in methanol, refluxed for 3 days, and the detection reaction was completely rotary evaporated to remove methanol, washed with ether to obtain Product 1.5g; Gained product is analyzed, and data is as follows: 1 H NMR (CDCl 3 , 400Hz): δ (ppm): hydrogen on the aliphatic chain 0.79 (4H, t); 1.29 (4H, m); 1.68 (4H, m); 4.01 (4H, t); 5.48 (4H, s); imidazole Hydrogens on the ring 9.89 (2H,d); 7.67-7.64 (4H,d) Hydrogens on the pyridine ring 8.76 (2H,d); 8.25 (2H,d). 7.25 (2H, dd). The above results prove that the obtained compound is compound 6c.

[0049] (2) Weigh compound 6c (1.0g, 1.7mmol) and completely dissolve it in methanol, CoCl 3 .6H 2 O (0.16g, 0.066mmol) was dissolved in 5mL of water, slowly added to the methanol solution of compound 6c, s...

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Abstract

The invention belongs to dye sensitized solar cells and in particular relates to a cobalt (III / II) ligand ion liquid redox couple. The cobalt ion liquid redox couple comprises cobalt (II) ligand ion liquid and cobalt (III) ligand ion liquid, wherein chemical structure formulae of the cobalt (II) ligand ion liquid and the cobalt (III) ligand ion liquid are respectively as follows: in the formulae, wherein R is selected from C1-C6 alkyl. According to the invention, the prepared cobalt (III / II) ion liquid redox couple can be soluble in an ion liquid system, so that volatile organic liquid is avoided being used as a solvent, the problems of easy leakage, difficult packaging and poor thermal stability of the solar cells are solved, the industrialization of the dye sensitized solar cells is facilitated, and the application prospect is wide.

Description

technical field [0001] The invention belongs to a dye-sensitized solar cell, in particular to a preparation method of a cobalt (III / II) ligand ionic liquid redox couple and its application in a dye-sensitized solar cell, which can replace the traditional dye-sensitized solar cell The commonly used I in electrolyte - / I 3 - redox couple. Background technique [0002] Among the new generation of thin-film solar cells, dye-sensitized solar cells are considered to be one of the solar cells with the most market potential due to their low cost, simple manufacturing process, and high photoelectric conversion efficiency. (H'Nusbaumer et al. J.Phys.Chem.B, 2001, 105, 10461-10464) Wherein the dye-sensitized solar cell is filled with an electrolyte containing a redox pair between the positive and negative electrodes. The working principle of dye-sensitized solar cells is: the dye molecules adsorbed on the electrode surface are injected into the TiO2 conduction band from the excited...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/022H01G9/20H01M14/00C07D401/14
CPCY02E10/542
Inventor 严锋徐丹赵杰
Owner SUZHOU UNIV