CN-121972234-A - Metal doped MoSe2Piezoelectric catalyst, preparation method and application

Abstract

The invention discloses a metal doped MoSe 2 piezoelectric catalyst, a preparation method and application thereof, wherein the catalyst is prepared by loading metal monoatoms on the surface of MoSe 2 , presenting a nano flower-like structure formed by ultrathin nanosheets, and generating the metal monoatoms on the surface of MoSe 2 in situ, wherein the metal is Ag, ru, ni, pt or Pd. According to the invention, the metal monoatoms are introduced into MoSe 2 , so that active sites are enriched, the carrier separation efficiency is improved, the catalyst is used for catalyzing plastics to be converted into H 2 and CO, the conversion rate is high, and the content of a byproduct CH 4 is extremely low.

Inventors

• ZHONG QIANG
• XUE YAN
• LAI YANMEI
• YANG SHAOGUI
• WANG YUECHENG
• HE HUAN

Assignees

• 南京师范大学

Dates

Publication Date

20260505

Application Date

20260129

Claims (10)

1. 1. The metal doped MoSe 2 piezoelectric catalyst is characterized in that the catalyst is formed by loading metal monoatoms on the surface of MoSe 2 , presenting a nano flower-like structure formed by ultrathin nanosheets, and is obtained by generating the metal monoatoms on the surface of MoSe 2 in situ, wherein the metal is Ag, ru, ni, pt or Pd.
2. 2. The metal-doped MoSe 2 piezoelectric catalyst according to claim 1, wherein the content of metal monoatoms in the catalyst is 0.76-4.57%.
3. 3. A method for preparing the metal-doped MoSe 2 piezoelectric catalyst according to claim 1 or 2 is characterized by comprising the steps of uniformly dispersing MoSe 2 powder in a solvent, dropwise adding a metal salt solution under stirring, dropwise adding a reducing agent after uniformly stirring, stirring for reaction, washing and drying to obtain the metal-monoatomic-supported MoSe 2 piezoelectric catalyst.
4. 4. The method for preparing a metal doped MoSe 2 piezoelectric catalyst according to claim 3, wherein the reducing agent is sodium borohydride or hydrazine hydrate.
5. 5. The method for preparing the metal-doped MoSe 2 piezoelectric catalyst according to claim 3, wherein when the reducing agent is sodium borohydride, the molar ratio of MoSe 2 , metal salt and sodium borohydride is 400:3-18:40.
6. 6. The method for preparing the metal-doped MoSe 2 piezoelectric catalyst according to claim 3, wherein the reaction temperature is 20-30 ℃.
7. 7. The method for preparing the metal-doped MoSe 2 piezoelectric catalyst according to claim 6, wherein the reaction time is 11-15 hours.
8. 8. The method for preparing the metal-doped MoSe 2 piezoelectric catalyst according to claim 3, wherein the preparation method of the MoSe 2 powder comprises the steps of dissolving sodium borohydride in deionized water, adding selenium powder and sodium molybdate, uniformly mixing, performing hydrothermal reaction, cooling, washing and drying to obtain MoSe 2 powder.
9. 9. The method for preparing the metal-doped MoSe 2 piezoelectric catalyst according to claim 3, wherein the hydrothermal temperature is 200-220 ℃.
10. 10. Use of a metal doped MoSe 2 piezoelectric catalyst according to any one of claims 1 to 3 to catalyse the conversion of plastics to CO and H 2 .

Description

Metal doped MoSe 2 piezoelectric catalyst and preparation method and application thereof Technical Field The invention relates to a piezoelectric catalyst and a preparation method and application thereof, in particular to a metal doped MoSe 2 piezoelectric catalyst and a preparation method and application thereof. Background The continuous accumulation of plastic waste has become a global ecological problem to be broken. Plastics are widely permeated in various fields of production and life by virtue of excellent durability and low production cost, but have extremely strong chemical stability and degradation resistance, so that only a small amount of plastic waste is effectively recycled in the global scope, and the rest is disposed in a landfill, incineration or scattering environment mode. The landfill process releases methane isothermal chamber gas to exacerbate climate warming, toxic and harmful pollutants are generated by incineration to threaten an ecological system, and micro plastics scattered into the environment are enriched through a food chain to endanger biological health, so that a malignant cycle of production, consumption and abandonment is formed. Under the background, development of sustainable plastic recycling strategies with both environmental and economic benefits is not slow, and the technology of chemical upgrading and recycling of waste plastics has become the focus of current research because low-value wastes can be directionally converted into high-value-added fuels, chemicals and functional materials. In the innovative exploration of chemical upgrading recovery technology, piezoelectric catalysis is gradually developed into a core technical path for high-value utilization of plastics by virtue of the direct conversion characteristic of mechanical energy and chemical energy. Under the mechanical excitation of low energy consumption, the piezoelectric catalysis can efficiently break chemical bonds such as C-C, C-H in a plastic molecular chain, and realize directional conversion. Especially in the field of synthesis gas (CO/H 2) preparation, clean fuel with high energy density is recovered from waste, dependence on fossil resources is reduced, and the synergy of environmental treatment and energy recovery is truly realized. As a typical transition metal chalcogenide, molybdenum diselenide (MoSe 2) provides an ideal material substrate for piezocatalytically driven plastic recycling by virtue of remarkable piezoelectric response, excellent mechanical flexibility and high specific surface area. However, moSe 2 still faces a key bottleneck in practical application, and the nano-sheets are easy to agglomerate, so that the active sites are not exposed enough, and the intrinsic piezoelectric coefficient and carrier separation efficiency are required to be improved. Disclosure of Invention The first aim of the invention is to provide a metal doped MoSe 2 piezoelectric catalyst which is rich in active sites and high in carrier separation efficiency, the second aim of the invention is to provide a preparation method of the metal doped MoSe 2 piezoelectric catalyst, and the third aim of the invention is to provide application of the metal doped MoSe 2 piezoelectric catalyst. According to the technical scheme, the metal doped MoSe 2 piezoelectric catalyst is obtained by loading metal monoatoms on the surface of MoSe 2, presenting a nano flower-shaped structure formed by ultrathin nanosheets and generating the metal monoatoms on the surface of MoSe 2 in situ, wherein the metal is Ag, ru, ni, pt or Pd. Preferably, the content of gold monoatoms in the catalyst is 0.76% -4.57% (mole fraction). When the metal monoatomic load is too low, the active sites are insufficient, and when the load is too high, part of the active sites are covered, so that the electronic structure is changed or mass transfer is limited, and the catalytic efficiency is reduced. Further preferably, the content of metal monoatoms in the catalyst is 1.5% -3.8% (mole fraction). The preparation method of the metal doped MoSe 2 piezoelectric catalyst comprises the following steps of uniformly dispersing MoSe 2 powder in a solvent, dropwise adding a metal salt solution under stirring, dropwise adding a reducing agent after uniformly stirring, stirring for reaction, washing and drying to obtain the metal single-atom-loaded MoSe 2 piezoelectric catalyst. Preferably, the reducing agent is sodium borohydride or hydrazine hydrate. Preferably, when the reducing agent is sodium borohydride, the molar ratio of MoSe 2, metal salt and sodium borohydride is 400:3-18:40. Preferably, the reaction temperature is 20-30 ℃. Further preferably, the reaction time is 11-15 hours. Preferably, deionized water and absolute ethyl alcohol are adopted for washing respectively. Preferably, the drying is vacuum drying, the drying temperature is 50-65 ℃, and the drying time is 12-18 hours. Preferably, the preparation method of the MoSe 2 powder comprises the ste