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Doped quantum dot catalyst and preparation method thereof, hydrogen production system and hydrogen production method comprising doped quantum dot catalyst

A technology of quantum dots and catalysts is applied in the field of hydrogen production systems of quantum dot catalysts, which can solve the problems of poor stability, large particles, and difficult to control the loading capacity.

Active Publication Date: 2019-06-14
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] How to further improve the photocatalytic hydrogen production efficiency of the quantum dot system is in front of us! Loading metals and metal compounds on the photosensitizer by photodeposition or thermal deposition has problems such as large particles and difficult control of the loading capacity, and the stability of this direct addition to the co-catalyst system is poor

Method used

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  • Doped quantum dot catalyst and preparation method thereof, hydrogen production system and hydrogen production method comprising doped quantum dot catalyst
  • Doped quantum dot catalyst and preparation method thereof, hydrogen production system and hydrogen production method comprising doped quantum dot catalyst
  • Doped quantum dot catalyst and preparation method thereof, hydrogen production system and hydrogen production method comprising doped quantum dot catalyst

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preparation example Construction

[0092] The preparation of quantum dots can be obtained by referring to the following literature [J.Phys.Chem.B,2003,107,8-13; Mater.Lett.2006,60,3782-3785; Ind.Eng.Chem.Res.2007,46 , 2013-2019; Chin. J. Inorg. Chem. 2008, 1186-1190.]. The present invention is exemplified as follows: take the preparation of CdSe / ZnS quantum dots as an example [Chin.J.Inorg.Chem.2008, 1186-1190]. The first step is to synthesize CdSe quantum dots. The experimental steps include: ① Preparation of Na 2 SeSO 3 : Weigh 40.0mg selenium powder (0.5mmoL) and add to 100mL Na 2 SO 3 (189mg) in aqueous solution, degassed for 30min. Heat to reflux until the selenium powder is completely dissolved to obtain clear and transparent Na 2 SeSO 3 Solution, pass argon gas for 30min, and store in the dark; ②Synthesize CdSe quantum dots. Add 46 mg CdCl to a 500 mL single-necked round bottom flask 2 ·5 / 2H 2 O (0.2mmoL), 190mL deionized water, 26μL mercaptopropionic acid (0.3mmoL), adjust the pH value to 11.00...

Embodiment 1

[0096] A method for stably dispersing quantum dots synthesized in an aqueous phase in an organic solvent, comprising the following steps:

[0097] Take 50 mL of the prepared CdSe / ZnS quantum dot stock solution, evaporate and concentrate; put the concentrated CdSe / ZnS solution in a 50 mL centrifuge tube, add isopropanol for precipitation. Place the centrifuge tube in a centrifuge for centrifugation, the centrifugation speed is 5000r / min, and the centrifugation time is 10min. The precipitate is washed 2-3 times with chromatographically pure methanol. The purpose of washing with methanol is to purify the synthesized quantum dot solution and remove the solution containing the S 2- ,Zn 2+ and other impurity ions.

[0098] The purified 6.7×10 -7 mol CdSe / ZnS quantum dots were placed in a 50mL centrifuge tube, 10mL of chromatographically pure methanol solution was added, and it was placed in an ultrasonic cleaner for 2 hours of sonication. At this time, CdSe / ZnS quantum dots can ...

Embodiment 2

[0100] A kind of synthetic method of oil phase quantum dot, comprises the following steps:

[0101] (1) Synthesis of CdSe quantum dots in the oil phase: Weigh 0.06g CdO, 0.28g n-octadecyl phosphate (ODPA) and 3.0g tri-n-octylphosphine oxide (TOPO) mixture in a 25mL round bottom flask, argon Heated to 300°C under protection until the CdO was completely dissolved and the solution became clear, injected 1.5g of tri-n-octylphosphine (TOP), raised the temperature to 350°C, and quickly injected the precursor of (0.058g Se+0.36gTOP), after 5s Turn off heat.

[0102] (2) Synthesis of CdSe / CdS core-shell quantum dots in oil phase: Take 0.29g ODPA, 0.08g n-hexyl phosphoric acid (HPA), 0.06g CdO and 3.0g TOPO in a 25mL round bottom flask, and heat to 300°C, until CdO is completely dissolved, add 1.5g TOP, heat up to 350°C, quickly add CdSe (0.8μmol), S source (0.12g sulfur powder dissolved in 1.5g TOP), stop heating after 8 minutes of reaction, and get an orange color colloid.

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Abstract

The invention discloses a quantum dot catalyst doped with metal ions. The catalyst includes a light-harvesting unit and a catalyzing unit, wherein the light-harvesting unit includes one, two or several kinds of quantum dots, and the catalyzing unit comprises the metal ions doped in the quantum dots. The metal ions are dispersed on the quantum dots in the following one or several manners that: (1) the metal ions are adhered to the surface of the quantum dots; (2) the metal ions are uniformly dispersed in the quantum dots; (3) the metal ions are disposed in the quantum dots in a gradient alloy way; (4) the metal ions are merely disposed on cores of core-shell quantum dots; (5) the metal ions are merely disposed on shells of the core-shell quantum dots; (6) both the cores and shells of the core-shell quantum dots are doped with the metal ions. The invention further discloses a photocatalytic hydrogen production system of doped quantum dots. The system has high efficiency of a quantum-dot-catalyst photocatalytic hydrogen production system and simplicity of a single quantum-dot photocatalytic hydrogen production system. The system can conveniently combine with an oxygen production half-reaction to totally decompose water.

Description

technical field [0001] The invention relates to the field of energy, in particular to a doped quantum dot catalyst and a preparation method thereof, a hydrogen production system and a hydrogen production method comprising the doped quantum dot catalyst. Background technique [0002] With the rapid development of society, the consumption of energy, especially non-renewable energy, has increased sharply, which has caused serious energy and environmental problems. Therefore, people urgently need to find new renewable energy sources. Hydrogen has the characteristics of non-pollution, high calorific value, renewable and sustainable utilization, so it has attracted widespread attention. [0003] In 1912, Professor Giacomo Ciamician of the University of Bologna [Science1912, 36, 385-394] proposed that people can study photosynthesis in nature and store solar energy in the form of chemical energy in corresponding compounds. In 1972, Japanese scientists Fujishima and Honda discover...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057C01B3/32
Inventor 吴骊珠高雨季李旭兵李治军
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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