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Mn-doped CISe-ZnSe core-shell structure quantum dot as well as preparation method and application of Mn-doped CISe-ZnSe core-shell structure quantum dot

A core-shell structure and quantum dot technology, applied in the field of photoelectrochemical cells, can solve the problems of quantum dots not being environmentally friendly, low activity of photoelectrochemical cells, etc., achieve excellent photocurrent stability, improve photoelectric performance, and promote the effect of separation

Pending Publication Date: 2022-05-31
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the above technical problems, the object of the present invention is to provide a Mn-doped CISe@ZnSe core-shell quantum dot and its preparation method and application, so as to solve the problem that the existing quantum dots are not environmentally friendly and the photoelectrochemical cells prepared by them have low activity. The problem

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  • Mn-doped CISe-ZnSe core-shell structure quantum dot as well as preparation method and application of Mn-doped CISe-ZnSe core-shell structure quantum dot
  • Mn-doped CISe-ZnSe core-shell structure quantum dot as well as preparation method and application of Mn-doped CISe-ZnSe core-shell structure quantum dot
  • Mn-doped CISe-ZnSe core-shell structure quantum dot as well as preparation method and application of Mn-doped CISe-ZnSe core-shell structure quantum dot

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Embodiment 1

[0036] A Mn-doped CISe@ZnSe core-shell quantum dot, the preparation method of which comprises the following steps:

[0037] (1) Synthesis of Mn-doped CuInSe quantum dot solution

[0038] Add 0.05mmol of cuprous iodide, 0.05mmol of manganese acetate, 0.1mmol of indium acetate, 5mL of dodecanethiol and 0.5mL of oleic acid into a 50mL three-neck flask. After mixing, degas under vacuum at 100°C for 30min. Then 1 mL of selenium precursor solution was added dropwise, and then kept at 150°C for 20 minutes to nucleate the quantum dots to obtain the nuclei solution, that is, the Mn-doped CuInSe quantum dot solution; wherein, the selenium precursor solution was obtained by adding 0.2 mmol of selenium powder Prepared by dissolving in 1mL octadecene solution;

[0039] (2) Synthesis of Mn-doped CISe@ZnSe core-shell quantum dots

[0040] When the nucleosome solution is cooled to 100°C, add 1mL zinc stearate solution dropwise, then heat to 200°C, and keep warm for 30min. After cooling, tra...

Embodiment 2

[0042] A Mn-doped CISe@ZnSe core-shell quantum dot, the preparation method of which comprises the following steps:

[0043] (1) Synthesis of Mn-doped CuInSe quantum dot solution

[0044]Add 0.05mmol of cuprous iodide, 0.06mmol of manganese acetate, 0.1mmol of indium acetate, 4.5mL of dodecanethiol and 0.5mL of oleic acid into a 50mL three-necked flask. After mixing, degas under vacuum at 90°C for 40min , then add 1mL of selenium precursor solution dropwise, and then keep it warm for 25min at 100°C to nucleate the quantum dots to obtain the nucleosome solution, that is, Mn-doped CuInSe quantum dot solution; wherein, the selenium precursor solution is obtained by adding 0.3mmol selenium The powder is prepared by dissolving in 1mL octadecene solution;

[0045] (2) Synthesis of Mn-doped CISe@ZnSe core-shell quantum dots

[0046] When the nucleosome solution is cooled to 90°C, add 1mL of zinc stearate solution dropwise, then heat to 180°C, and keep warm for 35min. After cooling, ...

Embodiment 3

[0048] A Mn-doped CISe@ZnSe core-shell quantum dot, the preparation method of which comprises the following steps:

[0049] (1) Synthesis of Mn-doped CuInSe quantum dot solution

[0050] Add 0.05mmol of cuprous iodide, 0.04mmol of manganese acetate, 0.1mmol of indium acetate, 6mL of dodecanethiol and 0.5mL of oleic acid into a 50mL three-neck flask. After mixing, degas under vacuum at 110°C for 20min. Then 1 mL of selenium precursor solution was added dropwise, and then kept at 180°C for 15 minutes to nucleate the quantum dots to obtain the nuclei solution, that is, the Mn-doped CuInSe quantum dot solution; wherein, the selenium precursor solution was mixed with 0.1 mmol selenium powder Prepared by dissolving in 1mL octadecene solution;

[0051] (2) Synthesis of Mn-doped CISe@ZnSe core-shell quantum dots

[0052] When the nucleosome solution was cooled to 110°C, 1mL of zinc stearate solution was added dropwise, then heated to 220°C, and kept warm for 25min. After cooling, 2m...

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Abstract

The invention discloses a Mn-doped CISe-ZnSe core-shell structure quantum dot and a preparation method and application thereof.The quantum dot comprises a core body and a shell wrapping the core body, the core body is a Mn-doped CuInSe quantum dot, and the shell is ZnSe. The Mn-doped CISe-ZnSe core-shell structure quantum dot is good in stability, the photoelectric property of a photoelectrochemical cell sensitized by the quantum dot can be remarkably improved, which is mainly attributed to that after a transition metal Mn-doped CISe system, an intermediate energy level is created, additional electrons can be provided to be injected into a photoanode, compounding of electron hole pairs can be delayed, and the photoelectric performance of the photoelectrochemical cell is improved. And electron hole pair separation is promoted, so that the photoelectric property of the photoelectrochemical cell is improved, and the saturation photocurrent of the photoanode reaches 2.9 mA cm <-2 >.

Description

technical field [0001] The invention relates to the technical field of photoelectrochemical cells, in particular to a Mn-doped CISe@ZnSe core-shell quantum dot and its preparation method and application. Background technique [0002] Photoelectrochemical cell technology is a new type of cell technology that directly utilizes light energy and converts it into chemical energy. It usually consists of photoactive photoelectrodes, electrolytes, and circuits. Its structure is simple and it is widely used in the field of solar energy conversion. Hydrogen production by photoelectrochemical cells has a lower device cost than the technology of first photovoltaic power generation and then electrolysis of water, but it cannot be put into practical application on a large scale at present, mainly limited to quantum dots containing heavy metal elements such as Pb and Cd, although Quantum dots are widely used in photoelectrochemical cells due to their adjustable energy band structure and wi...

Claims

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Application Information

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IPC IPC(8): C09K11/88C09K11/02H01G9/20H01G9/042
CPCC09K11/883C09K11/02H01G9/2063Y02E60/36
Inventor 童鑫王瑞王志明张逸轩周楠
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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