Preparation method of self-supporting Mo-Zn nanosheet

Abstract

The invention belongs to the field of material preparation, and particularly relates to a self-supporting Mo-Zn nanosheet prepared through one-step corrosion engineering, which is characterized in that molybdenum pentachloride and zinc chloride are used as raw materials, foamed nickel is corroded at room temperature, and a self-supporting Mo-Zn nano catalyst is obtained; the whole preparation method is simple and efficient, the synthesis time of the catalyst material is effectively shortened, and the synthesis rate of the electrocatalyst is increased; the method can realize large-scale preparation of the material, and is of great significance to actual scale production and application. And through simultaneous modification of different transition metals, the prepared nano material can show excellent electro-catalytic reaction performance.

Description

Technical Field

[0001] The invention relates to a method for preparing a self-supporting Mo-Zn nanosheet, and belongs to the field of material preparation. Background Art

[0002] As a clean energy carrier, hydrogen is widely considered a strong contender to replace fossil fuels due to its high energy density, excellent conversion efficiency, and pollution-free combustion. Electrocatalytic water splitting technology is considered the best method for producing hydrogen energy in an efficient and environmentally friendly manner. However, hydrogen production from water electrolysis is severely limited by the sluggish kinetics of the anodic oxygen evolution reaction. Transition metal-based catalysts, due to their unique electronic configuration and low cost, have become ideal alternatives to precious metal catalysts with excellent electrocatalytic performance. In addition, self-supporting nanomaterials with porous structures can provide a large specific surface area, fully exposing the active sites of the catalyst, thereby improving the efficiency of the catalytic reaction. However, due to the influence of intrinsic activity and the complexity of the synthesis process, their actual large-scale production and application are limited. Therefore, rationally designing synthesis methods and optimizing synthesis strategies to synthesize transition metal-modified self-supporting nanomaterials with excellent performance has become a research hotspot.

[0003] To simplify the synthesis process and reduce energy consumption, we obtained a self-supporting Mo-Zn nanosheet through a one-step corrosion process and applied it to the study of electrocatalytic water splitting. Summary of the Invention

[0004] The present invention aims to provide a method for preparing self-supporting Mo-Zn nanosheets

[0005] Based on the above objectives, the technical solutions involved in the present invention are as follows:

[0006] 1. A self-supporting Mo-Zn nanosheet was synthesized through a one-step corrosion process. Molybdenum pentachloride and zinc chloride were used as raw materials and nickel foam was corroded at room temperature. This nanomaterial exhibited excellent electrocatalytic performance. The specific synthesis process is as follows:

[0007] 1) Preparation of self-supporting Mo-Zn nanosheets

[0008] The nickel foam is placed in a 10-50 mL solution of 0.01-0.06 g of molybdenum pentachloride and 0.01-0.1 g of zinc chloride, and reacted at room temperature for 5-30 hours. The self-supporting Mo-Zn nanosheets are obtained by rinsing and drying in a vacuum drying oven.

[0009] 2. Self-supporting Mo-Zn nanosheets prepared by corrosion engineering exhibit excellent electrocatalytic activity; reaching a current density of 12.5 mA cm -2 The nanomaterial has an overpotential of 244 mV. With this advantage, it can be used for efficient water electrolysis to produce hydrogen.

[0010] The present invention has the following advantages:

[0011] 1) The present invention uses molybdenum pentachloride and zinc chloride as raw materials and etches nickel foam at room temperature to obtain self-supporting Mo-Zn nanosheets, which effectively expands the preparation method of self-supporting nanomaterials.

[0012] 2) The preparation method of the present invention is simple and efficient, effectively shortening the synthesis time of the catalyst material and increasing the rate of electrocatalyst synthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a scanning electron micrograph of the self-supporting Mo-Zn nanosheets obtained in Example 1.

[0014] Figure 2 1 is the X-ray diffraction spectrum of the self-supporting Mo-Zn nanosheets obtained in Example 1.

[0015] Figure 3 This is the X-ray photoelectron spectrum of the self-supporting Mo-Zn nanosheets obtained in Example 1. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the following examples, but the present invention is not limited to the following examples.

[0017] Example 1

[0018] Molybdenum pentachloride (0.04 g) and zinc chloride (0.08 g) were added to 30 mL of deionized water to form a uniform solution. The treated nickel foam was immersed in the above solution and reacted for 12 hours. After rinsing and drying in a vacuum drying oven, self-supporting Mo-Zn nanosheets were obtained.

[0019] Figure 1 This is a scanning electron microscope image of a self-supporting Mo-Zn nanosheet, from which the structure of the nanosheet can be seen.

[0020] Figure 2 This is the X-ray diffraction spectrum of the self-supporting Mo-Zn nanosheets. It can be seen that the obtained nanomaterial is composed of Zn3Mo2O8(OH)2.

[0021] Figure 3 The X-ray photoelectron spectroscopy of the self-supporting Mo-Zn nanosheets confirmed the presence of elements such as Mo and Zn.

[0022] Example 2

[0023] Molybdenum pentachloride (0.02 g) and zinc chloride (0.08 g) were added to 30 mL of deionized water to form a uniform solution. The treated nickel foam was immersed in the above solution and reacted for 12 hours. The product was then rinsed and dried in a vacuum drying oven to obtain self-supporting Mo-Zn nanosheets.

[0024] Example 3

[0025] Molybdenum pentachloride (0.04 g) and zinc chloride (0.04 g) were added to 30 mL of deionized water to form a uniform solution. The treated nickel foam was immersed in the above solution and reacted for 12 hours. The product was then rinsed and dried in a vacuum drying oven to obtain self-supporting Mo-Zn nanosheets.

[0026] Example 4

[0027] Molybdenum pentachloride (0.06 g) and zinc chloride (0.1 g) were added to 30 mL of deionized water to form a uniform solution. The treated nickel foam was immersed in the above solution and reacted for 30 h. The product was then rinsed and dried in a vacuum drying oven to obtain self-supporting Mo-Zn nanosheets.

[0028] Example 5

[0029] Example 1 was used as the working electrode to test the electrocatalytic water splitting performance on a CHI760E workstation. When the current density reached 12.5 mA cm -2 When , the overpotential required for the nanomaterial is 244mV.

Claims

1. A method for preparing self-supporting Mo-Zn nanosheets, comprising: using molybdenum pentachloride and zinc chloride as raw materials, corroding nickel foam at room temperature to obtain self-supporting Mo-Zn nanosheets, wherein the nanomaterial exhibits excellent electrocatalytic oxygen evolution reaction performance; the self-supporting Mo-Zn nanosheets are obtained by the following preparation method: dissolving 0.01-0.06g of molybdenum pentachloride and 0.01-0.1g of zinc chloride in 10-50mL of deionized water to obtain a uniform solution; placing the treated nickel foam in the above solution to react at room temperature for 12-30h; rinsing, and drying in a vacuum drying oven to obtain the self-supporting Mo-Zn nanosheets.

2. The method according to claim 1, characterized in that: Self-supporting Mo-Zn nanosheets were used for electrocatalytic water splitting at room temperature when the current density reached 12.5 mA cm -2 When , the overpotential required for the nanomaterial is 244mV.

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