Method for preparing metal zinc nanosheet array

Abstract

The invention relates to a method for preparing a metal zinc nanosheet array, and relates to the field of preparation of new metallurgical materials. The production zinc electrolyte containing 30-65 g / L of zinc, 130-180 g / L of sulfuric acid and 5-30 mg / L of gelatin is used as a base solution; tannic acid is added into the base solution, and after the tannic acid is fully dissolved and mixed, the saturation concentration of the tannic acid reaches 0.2-0.4 time; and electrolyzing by adopting a traditional zinc electrolysis process to prepare the metal zinc nanosheet array. The method has the advantages of simple process, low cost and large-scale production; and the prepared zinc sheet is high in purity and has a rich nanosheet array structure.

Description

Technical Field

[0001] The present application relates to the field of preparation of new metallurgical materials, and in particular to a method for preparing a metal zinc nanosheet array. Background Art

[0002] Metallic zinc nanosheet arrays have high specific surface area and high activity. They are the precursor for preparing high-voltage (1.6V) sodium-ion battery positive electrode material K2Zn3(Fe(CN)6)2·9H2O (DOI:10.1002 / smll.201905115), and are also the precursor for efficiently preparing nano zinc oxide with a multi-level structure through oxidation.

[0003] Currently, there are few methods for preparing metal zinc nanosheet arrays. Therefore, it is meaningful to develop a new method for preparing metal zinc nanosheets. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a metal zinc nanosheet array, which is specifically achieved through the following technical scheme.

[0005] A method for preparing a metal zinc nanosheet array, the steps of which are as follows:

[0006] A production zinc electrolyte containing 30-65 g / L zinc, 130-180 g / L sulfuric acid and 5-30 mg / L gelatin is used as the base liquid, and tannic acid is used as the core additive; tannic acid is added into the base liquid, and the tannic acid reaches a certain concentration after being fully dissolved and mixed; the metal zinc nanosheet array can be prepared by using a traditional zinc electrolysis process.

[0007] The certain concentration is 0.2 to 0.4 times the saturation concentration.

[0008] The parameters of the conventional zinc electrolysis process are as follows: electrolyte temperature 37-44°C, cathode aluminum plate, anode lead-silver alloy plate, current density 400-650A / m 2 , the same inter-electrode distance is 5 to 7 cm, and the electrolysis cycle is 8 to 48 hours.

[0009] The beneficial effects of the present invention are as follows: the method has the advantages of simple process, low cost and large-scale production; the prepared zinc sheet has high purity and a rich nanosheet array structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the SEM image of the metal zinc nanosheet array prepared in Example 1 (a-low magnification, b-high magnification).

[0011] Figure 2 This is the SEM image of the metal zinc nanosheet array prepared in Example 2 (a-low magnification, b-high magnification). DETAILED DESCRIPTION

[0012] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0013] Example 1

[0014] The method for preparing the metal zinc nanosheet array comprises the following steps:

[0015] A production zinc electrolyte containing 30 g / L zinc, 130 g / L sulfuric acid and 5 mg / L gelatin is used as the base liquid, and tannic acid is used as the core additive; tannic acid is added to the base liquid, and the tannic acid reaches 0.2 times the saturation concentration after being fully dissolved and mixed; a traditional zinc electrolysis process (specifically: electrolyte temperature 37°C, cathode aluminum plate, anode lead-silver alloy plate containing 1% silver, current density 400 A / m2, same inter-electrode distance 5 cm, electrolysis cycle 8 h) can be used to prepare a metal zinc nanosheet array (sheet thickness of about 184 nm, such as Figure 1 shown).

[0016] Example 2

[0017] The method for preparing the metal zinc nanosheet array comprises the following steps:

[0018] A production zinc electrolyte containing 50 g / L zinc, 160 g / L sulfuric acid and 15 mg / L gelatin is used as the base liquid, and tannic acid is used as the core additive; tannic acid is added to the base liquid, and after sufficient dissolution and mixing, the tannic acid reaches 0.3 times the saturation concentration; a traditional zinc electrolysis process (specifically: electrolyte temperature 40°C, cathode is an aluminum plate, anode is a lead-silver alloy plate containing 1% silver, current density 550A / m2, same inter-electrode distance 6cm, electrolysis cycle 24h) can be used to prepare a metal zinc nanosheet array (sheet thickness is about 231nm, such as Figure 2 shown).

[0019] Example 3

[0020] The method for preparing the metal zinc nanosheet array comprises the following steps:

[0021] The production zinc electrolyte containing 65g / L zinc, 180g / L sulfuric acid and 30mg / L gelatin is used as the base liquid, and tannic acid is used as the core additive; tannic acid is added to the base liquid, and after being fully dissolved and mixed, the tannic acid reaches 0.4 times the saturation concentration; the traditional zinc electrolysis process (specifically: electrolyte temperature 44°C, cathode is aluminum plate, anode is lead-silver alloy plate containing 1% silver, current density 650A / m 2, the same inter-electrode distance of 7 cm, and the electrolysis period of 48 h can prepare the metal zinc nanosheet array (the thickness of the sheet is about 329 nm).

[0022] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A method for preparing a metal zinc nanosheet array, characterized in that: A production zinc electrolyte containing 30-65 g / L zinc, 130-180 g / L sulfuric acid and 5-30 mg / L gelatin is used as the base liquid; tannic acid is added to the base liquid, and after it is fully dissolved and mixed to reach 0.2-0.4 times the saturation concentration; then a traditional zinc electrolysis process is used for electrolysis to prepare a metal zinc nanosheet array.

2. The method for preparing an irregular columnar array zinc sheet according to claim 1, characterized in that: The parameters of the conventional zinc electrolysis process are as follows: electrolyte temperature 37-44°C, cathode aluminum plate, anode lead-silver alloy plate, current density 400-650A / m 2 , the same inter-electrode distance is 5 to 7 cm, and the electrolysis cycle is 8 to 48 hours.

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