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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

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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AI Technical Summary

Problems solved by technology

Traditional semiconductor materials have the performance of photocatalytic reduction of water to produce hydrogen, but they have the characteristics of poor ability to absorb visible light and slow catalytic rate

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

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: the synthesis of iridium complex

[0023] Add iridium(III) chloride and ring metal ligand L to a mixed solvent of 24ml ethylene glycol ether and water (V / V, 3:1) in a molar ratio of 1:2, and then cool to At room temperature, after the solvent was spin-dried, the intermediate product was separated on a silica gel column with ethyl acetate and n-hexane ((V / V, 3:1) as the eluent, and the red stream was collected. After the solvent was spin-dried, the intermediate product was obtained by drying. Product Ir 2 (L) 4 Cl 2 . With binuclear intermediate product and 4,-4'-dicarboxylic acid-2,2'-bipyridine, sodium carbonate is added in the second solvent in the ratio of 1:1.2:8 (for complex 1-3, the second Solvent is in the mixed solvent of methanol and dichloromethane (V / V, 1: 1), for complex 4, the second solvent is ethylene glycol ether solution), reflux reaction 24h under nitrogen protection, cool to room temperature, with The mixed solvent (V / V, 1:1) of met...

Embodiment 2

[0029] Photocatalytic reduction of water by iridium complexes in a homogeneous catalytic system to produce hydrogen: Add 2.7 μmol of iridium complexes to a mixture containing 0.28M triethanolamine, 0.02mM K 2 PtCl 4 , in a neutral aqueous solution of 0.135M LiCl (270ml), after the air in the reactor was pumped dry, it was irradiated under a 300W xenon lamp (λ>420nm), and the hydrogen gas generated by the reaction was quantitatively analyzed by gas chromatography. The systems in which complexes 1, 2, 3, and 4 are located produced 2027 μmol, 175 μmol, 55 μmol, and 9 μmol of hydrogen after 20 h of light irradiation, and the hydrogen evolution efficiency of complex 1 is the highest reported in aqueous solution.

Embodiment 3

[0031] Preparation of hydrogen by photocatalytic reduction of water with iridium complex-sensitized titanium dioxide in a heterogeneous system: place titanium dioxide in a methanol solution saturated with the complex, stir in the dark for 24 hours, filter out the sensitized titanium dioxide in solid state, and dry to obtain powder sample. Add 0.1 g of iridium complex-sensitized titanium dioxide solid (the amounts of iridium complexes in complexes 1, 2, 3, and 4 are 2.17 μmol, 3.01 μmol, 2.56 μmol, and 3.34 μmol, respectively) to a solution containing 0.28 M Triethanolamine, 0.02mM K 2 PtCl 4 , in a neutral aqueous solution of 0.135M LiCl (270ml), after the air in the reactor was pumped dry, it was irradiated under a 300W xenon lamp (λ>420nm), and the hydrogen gas generated was quantitatively analyzed by gas chromatography. The amount of hydrogen generated by complexes 1, 2, 3, and 4 after 20 h of light irradiation was 1253 μmol, 403 μmol, 131 μmol, and 512 μmol, respectively...

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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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