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Copper nano-electrode with high-index crystal face and preparation method and application thereof

A high-index crystal surface and copper nanotechnology, which is applied in nanotechnology, electrodes, nanotechnology, etc. for materials and surface science, can solve the problems of difficulty in suppressing side reactions and low product selectivity, and facilitate the promotion of industrialization. The preparation method is simple, and the effect of high-index crystal plane stability

Active Publication Date: 2020-08-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still a great challenge to explore copper-based catalysts with high current density and high product selectivity for carbon dioxide reduction reaction due to low product selectivity and difficulty in suppressing side reactions (hydrogen evolution reaction).

Method used

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  • Copper nano-electrode with high-index crystal face and preparation method and application thereof
  • Copper nano-electrode with high-index crystal face and preparation method and application thereof
  • Copper nano-electrode with high-index crystal face and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Copper nanowire electrode materials with high-index crystal faces were prepared by the following steps:

[0045] A. prepare reaction solution, prepare the copper sulfate solution of 0.1mol / L, the sodium hydroxide solution of 15mol / L and the mass concentration be the hydrazine hydrate solution of 35%, and the potassium chloride solution of 1mol / L;

[0046]B. Take 120 mL of 15 mol / L sodium hydroxide solution in a three-necked flask, add 6 mL of 0.1 mol / L copper sulfate solution under stirring, and after ultrasonication for five minutes, add 760 μL of ethylenediamine under stirring conditions and use an oil bath Preheat, when the temperature rises to 70 degrees Celsius, add 60 μL of hydrazine solution with a mass concentration of 35% under stirring, continue stirring for 3 minutes, turn off the stirring, keep the reaction temperature at 70 degrees Celsius, and react for 2 hours to obtain copper nanowires Dispersions;

[0047] C. Uniformly disperse the copper nanowire disp...

Embodiment 2

[0066] Using the copper nanowire electrode material prepared in Example 1, a potassium chloride solution was used as the electrolyte to carry out related tests on electrochemical reduction of carbon dioxide.

[0067] The test system adopts a three-electrode test system, wherein the working electrode is the copper nanowire electrode material prepared in Example 1, the counter electrode is a carbon rod electrode, and the reference electrode is a silver silver chloride electrode. The test conditions are: the electrolyte is a 1mol / L potassium chloride solution, and carbon dioxide gas is introduced into the electrolyte at a rate of 20 ml / min for 30 minutes before the test starts to saturate the electrolyte, and then Under the conditions of normal temperature and pressure plus stirring, the faraday efficiency and current density of the electrode were tested, and at different potentials, the constant potential scanning test method was used to measure the faraday efficiency of various ...

Embodiment 3

[0085] The copper nanowire electrode material with a high-index crystal plane was prepared according to the method described in Example 1. The difference from Example 1 is only that the treatment time of square wave potential is 30 minutes, 60 minutes, and 120 minutes, respectively. Finally, three copper nanowire electrode materials with high-index crystal planes were obtained.

[0086] The three copper nanowire electrode materials obtained above were characterized.

[0087] Figure 8-Figure 10 It is the scanning electron microscope image of the high-index crystal surface copper nanowire electrode material obtained after square wave treatment for 30 minutes, 60 minutes and 120 minutes.

[0088] Figure 8-Figure 10 It can be seen that with the increase of the square wave treatment time, the copper nanowires gradually become rough from the smooth surface at the beginning, until the treatment time is 90 minutes, the surface of the copper nanowires appears a step-like morphology...

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Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a copper nano-electrode with a high-index crystal face and a preparation method and application of thecopper nano-electrode. The electrode comprises a conductive substrate and a copper nanowire aggregate loaded on the surface of the conductive substrate; the length of the copper nanowire is 10-200 microns, the length-diameter ratio of the copper nanowire is larger than 1000, the surface of the copper nanowire is in a step shape and has high-index crystal faces, and the high-index crystal faces include but are not limited to high-index crystal faces (200), (220), (222), (311), (310), (320), (331), (400), (510), (511), (533), (610) and (755). The invention further discloses a preparation methodand application of the above electrode. The electrode material with the high-index crystal face is prepared for the first time, side reaction can be well inhibited when the electrode material is usedfor electrochemical reduction of carbon dioxide, and the electrode material has good selectivity on high-carbon products such as ethylene, ethanol and isopropanol.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a copper nano-electrode with a high-index crystal plane, a preparation method and application thereof. Background technique [0002] In recent years, with the massive exploitation and use of fossil fuels, the content of carbon dioxide in the atmosphere has increased dramatically, causing a series of serious environmental problems such as the greenhouse effect and global warming. At the same time, the problem of energy crisis has become increasingly prominent. Reducing the content of carbon dioxide in the atmosphere and finding new clean energy have become important issues at present. Electrocatalytic carbon dioxide reduction technology converts excess carbon dioxide in the atmosphere into renewable fuels or value-added chemicals without generating additional pollutants. It is an effective means to realize carbon cycle and solve energy and environmental pro...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B1/00C25B11/06B82Y30/00B82Y40/00C25B3/25
CPCC25B1/00B82Y30/00B82Y40/00C25B3/25C25B11/075
Inventor 邝允韩璐孙晓明
Owner BEIJING UNIV OF CHEM TECH
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