Iridium complex, preparation method of iridium complex, method for catalyzing and reducing water by using visible light and dye-sensitized solar cell

A technology of iridium complexes and products, which is applied in the field of dye-sensitized solar cells, can solve the problems of poor absorption of visible light and slow catalytic rate, and achieve the effect of simplifying the reaction system and reducing costs

Inactive Publication Date: 2012-06-13
NANJING UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Traditional semiconductor materials have the performance of photocatalytic reduction of water to produce h

Method used

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  • Iridium complex, preparation method of iridium complex, method for catalyzing and reducing water by using visible light and dye-sensitized solar cell
  • Iridium complex, preparation method of iridium complex, method for catalyzing and reducing water by using visible light and dye-sensitized solar cell
  • Iridium complex, preparation method of iridium complex, method for catalyzing and reducing water by using visible light and dye-sensitized solar cell

Examples

Experimental program
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Example Embodiment

[0022] Example 1: Synthesis of iridium complex

[0023] Add iridium(III) trichloride and the cyclometallic ligand L to 24ml of a mixed solvent of ethylene glycol ether and water (V / V, 3:1) at a molar ratio of 1:2, reflux and react for 24h, then cool to At room temperature, spin the solvent to dryness and separate the intermediate product in a silica gel column with ethyl acetate and n-hexane ((V / V, 3:1) as eluents, collect the red flow short, spin the solvent to dryness, and dry to obtain the intermediate product. Product Ir 2 (L) 4 Cl 2 . The binuclear intermediate product and 4,-4'-dicarboxylic acid-2,2'-bipyridine, sodium carbonate were added to the second solvent in a ratio of 1:1.2:8 (for complexes 1-3, the second The solvent is a mixed solvent of methanol and dichloromethane (V / V, 1:1), for complex 4, the second solvent is ethylene glycol ether solution), the reaction is refluxed for 24h under nitrogen protection, and cooled to room temperature. The mixed solvent of metha...

Example Embodiment

[0028] Example 2:

[0029] Iridium complex photocatalytically reduces water to produce hydrogen in a homogeneous catalytic system: 2.7 μmol of iridium complex is added to the content of 0.28M triethanolamine, 0.02mM K 2 PtCl 4 , 0.135M LiCl neutral aqueous solution (270ml), drain the air in the reactor, and irradiate it under a 300W xenon lamp (λ>420nm). The hydrogen generated by the reaction is quantitatively analyzed by gas chromatography. The amount of hydrogen generated in the system of complexes 1, 2, 3, and 4 after 20 hours of light exposure was 2027μmol, 175μmol, 55μmol, and 9μmol, respectively. The hydrogen generation efficiency of complex 1 is the highest currently reported in aqueous solutions.

Example Embodiment

[0030] Example 3:

[0031] In a heterogeneous system, iridium complex-sensitized titanium dioxide photocatalytically reduces water to produce hydrogen: place the titanium dioxide in a methanol solution saturated with the complex, stir for 24 hours in the dark, and then filter the sensitized titanium dioxide in a solid state and dry it. Powder samples. 0.1g solid titanium dioxide sensitized by iridium complexes (the amount of titanium dioxide sensitized by complexes 1, 2, 3, and 4 containing iridium complexes is 2.17 μmol, 3.01 μmol, 2.56 μmol, 3.34 μmol, respectively) was added to the content of 0.28M Triethanolamine, 0.02mM K 2 PtCl 4 , 0.135M LiCl neutral aqueous solution (270ml), after draining the air in the reactor, irradiate it under a 300W xenon lamp (λ>420nm), and the generated hydrogen gas is quantitatively analyzed by gas chromatography. The amount of hydrogen generated in the system of complexes 1, 2, 3, and 4 after 20 hours of light irradiation was 1253 μmol, 403 μmo...

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Abstract

The invention provides an iridium complex, which has a visible light reactivity and can be used for rapidly preparing hydrogen through reduction by catalyzing water by using visible light. The invention further provides a preparation method of the iridium complex, a method for preparing hydrogen by catalyzing and reducing the water by using the visible light by means of the iridium complex and a dye-sensitized solar cell containing the iridium complex. The iridium complex comprises a chemical formula of Ir(L)2Hbpdc, wherein L is 3-trifluoromethyl-2-phenyl benzothiazole, 2-phenyl benzothiazole, 2-phenyl-5-(trifluoromethyl) benzothiazole or 4-N,N dimethyl-phenyl-5-(trifluoromethyl) benzothiazole, and Hbpdc is 4-carboxyl-4'-carboxylate-2,2'-bipyridyl. The preparation method of the iridium complex comprises the steps of: dissolving iridium trichloride and L in a first solvent, reacting to obtain an intermediate product Ir2(L)4Cl2, and reacting the intermediate product with 4-4'-dicarboxylic acid-2,2'-bipyridyl and sodium carbonate to obtain the iridium complex.

Description

technical field [0001] The invention provides an iridium complex, a preparation method thereof, a method for realizing visible light catalytic reduction of water by using the iridium complex, and a prepared dye-sensitized solar cell. Background technique [0002] Since the beginning of the 21st century, the consumption of fossil energy has not only caused an energy crisis, but also severely damaged the environment in which human beings live. Finding and developing environmentally friendly and renewable green energy has become the focus of human attention. Hydrogen energy has the characteristics of clean and pollution-free, high calorific value of hydrogen, good combustion performance, multiple utilization forms, and large storage capacity; solar energy has the characteristics of universal, harmless, and long-term use. They are regarded as the most potential development in the 21st century. clean energy. Whether hydrogen can be widely used as a fuel depends on the hydrogen ...

Claims

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Application Information

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IPC IPC(8): C07F5/00C01B3/06H01G9/07H01G9/20H01M14/00H01L51/44
CPCY02E10/542Y02E60/36Y02E10/549
Inventor 于振涛元勇军邹志刚
Owner NANJING UNIV
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