Preparation method and application of hollow porous transition metal chalcogenide nanosheets

Abstract

The invention discloses a preparation method and application of hollow porous transition metal chalcogenide nanosheets. The preparation method comprises the following steps: performing a reaction on an alkaline solution of transition metal salt and water to obtain solid nanosheets of transition metal hydroxide, using the transition metal hydroxide as a precursor, performing a reaction on the transition metal hydroxide and chalcogenide anion X<2->, and performing anion exchange on the X<2-> and OH<-> to obtain the hollow porous nanosheets. The preparation method provided by the invention is an anion exchange and hydrothermal synthesis method, and is simple in process, low in cost and environment-friendly; and through adoption of different transition metal elements, the preparation method can be used for preparing a variety of transition metal chalcogen compound hollow porous nano-tablets, so that the preparation method is high in universality.

Description

technical field

[0001] The invention relates to the technical field of semiconductor nanomaterials, more specifically, to a universal preparation method and application of transition metal chalcogenide hollow porous nanosheets. Background technique

[0002] With the decrease of global fossil energy and the aggravation of environmental pollution, it is imminent to develop new, efficient and clean energy forms to meet the needs of sustainable development of human beings. Utilizing abundant and clean solar energy and other energy sources in nature to conduct semiconductor catalytic water splitting to produce hydrogen, oxygen or synthesize organic matter has become one of the effective ways to alleviate the pressure of energy shortage and reduce environmental pollution. As an important class of functional materials, transition metal chalcogenides have unique physical and chemical properties, and have potential applications in the fields of photochemistry, electrochemistry, and p...

Examples

Embodiment 1

[0045] 1. Raw materials: analytically pure cobalt nitrate hexahydrate, triethylamine, thioacetamide, ethanol

[0046] 2. Accurately weigh 0.1091g (0.37mmol) cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 15 mL of water and stir at room temperature until a pink homogeneous solution is formed.

[0047] 3. Slowly add 0.375mL triethylamine solution dropwise to the mixture under constant stirring, the pink solution will immediately turn dark blue.

[0048] 4. Add 14.625mL of water to the mixture at one time. The resulting solution was transferred to an autoclave with a total volume of 50 mL, then the autoclave was sealed, and placed in a constant temperature oven at 180° C. for 24 h to obtain an aqueous solution containing cobalt hydroxide (ie cobalt hydroxide solution).

[0049] 5. Weigh 0.0423g (0.563×10 -3 mmol) thioacetamide (TAA) was placed in 7.5 mL of water, and after stirring at room temperature to form a homogeneous solution, 4.5 mL of cobalt hydroxide s...

Embodiment 2

[0054] The steps are the same as in Example 1, except that in the sixth step, the autoclave is placed in an oven at 140° C. for 6 hours, then taken out and cooled to room temperature. Other reaction conditions remain unchanged, and the obtained results are basically consistent with the results obtained in Example 1.

Embodiment 3

[0056] The steps are the same as in Example 1, except that in the sixth step, the autoclave is placed in an oven at 160° C. for 6 hours, then taken out and cooled to room temperature. Other reaction conditions remain unchanged, and the obtained results are basically consistent with those obtained in Example 1. .

technical field

[0001] The invention relates to the technical field of semiconductor nanomaterials, more specifically, to a universal preparation method and application of transition metal chalcogenide hollow porous nanosheets. Background technique

[0002] With the decrease of global fossil energy and the aggravation of environmental pollution, it is imminent to develop new, efficient and clean energy forms to meet the needs of sustainable development of human beings. Utilizing abundant and clean solar energy and other energy sources in nature to conduct semiconductor catalytic water splitting to produce hydrogen, oxygen or synthesize organic matter has become one of the effective ways to alleviate the pressure of energy shortage and reduce environmental pollution. As an important class of functional materials, transition metal chalcogenides have unique physical and chemical properties, and have potential applications in the fields of photochemistry, electrochemistry, and p...

Examples

Embodiment 1

[0045] 1. Raw materials: analytically pure cobalt nitrate hexahydrate, triethylamine, thioacetamide, ethanol

[0046] 2. Accurately weigh 0.1091g (0.37mmol) cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) Dissolve in 15 mL of water and stir at room temperature until a pink homogeneous solution is formed.

[0047] 3. Slowly add 0.375mL triethylamine solution dropwise to the mixture under constant stirring, the pink solution will immediately turn dark blue.

[0048] 4. Add 14.625mL of water to the mixture at one time. The resulting solution was transferred to an autoclave with a total volume of 50 mL, then the autoclave was sealed, and placed in a constant temperature oven at 180° C. for 24 h to obtain an aqueous solution containing cobalt hydroxide (ie cobalt hydroxide solution).

[0049] 5. Weigh 0.0423g (0.563×10 -3 mmol) thioacetamide (TAA) was placed in 7.5 mL of water, and after stirring at room temperature to form a homogeneous solution, 4.5 mL of cobalt hydroxide s...

Embodiment 2

[0054] The steps are the same as in Example 1, except that in the sixth step, the autoclave is placed in an oven at 140° C. for 6 hours, then taken out and cooled to room temperature. Other reaction conditions remain unchanged, and the obtained results are basically consistent with the results obtained in Example 1.

Embodiment 3

[0056] The steps are the same as in Example 1, except that in the sixth step, the autoclave is placed in an oven at 160° C. for 6 hours, then taken out and cooled to room temperature. Other reaction conditions remain unchanged, and the obtained results are basically consistent with those obtained in Example 1. .

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