Dendritic copper electrode with hydrophobic surface and preparation method and application thereof

A crystalline copper and dendritic technology, applied in the field of electrocatalysis, can solve the problems of limiting the stability of electrocatalytic CO, reducing the intrinsic conductivity of electrodes, reducing the number of three-phase interfaces, etc., and achieving excellent electrocatalytic CO2 reduction activity, The effect of enhancing ion concentration and interfacial electric field, and increasing carbon-carbon coupling rate

Inactive Publication Date: 2020-09-11
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

The electrode prepared by this method is prone to catalyst detachment and electrode "flooding" phenomenon caused by excessive contact with the electrolyte during the electrolysis process, thus significantly reducing the number of three-phase interfaces and severely limiting the electrocatalytic CO in the flow electrolytic cell. 2 Restoration of stability
To solve this problem, some researchers use polymers or small organic molecules to hydrophobize the surface of the electrode, but this treatment method is cumbersome and reduces the intrinsic conductivity of the electrode, which has a negative impact on the catalytic performance.

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  • Dendritic copper electrode with hydrophobic surface and preparation method and application thereof
  • Dendritic copper electrode with hydrophobic surface and preparation method and application thereof
  • Dendritic copper electrode with hydrophobic surface and preparation method and application thereof

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preparation example Construction

[0038] The present invention also provides a method for preparing a surface-hydrophobic dendritic copper electrode, comprising the following steps:

[0039] Copper salt solution is used as the electroplating solution, the gas diffusion layer material is used as the working electrode, and the Ag / AgCl electrode is used as the reference electrode, and constant potential deposition is carried out to obtain a dendritic copper electrode with a hydrophobic surface;

[0040] The potential of the constant potential deposition relative to the Ag / AgCl reference electrode is -0.1--0.7V; the time of the constant potential deposition is 100-700s.

[0041] In the preparation method provided by the present invention, the electroplating solution is first prepared, and the electroplating solution is an aqueous copper salt solution, and the copper salt is preferably a soluble inorganic copper salt, including but not limited to one of copper sulfate, copper chloride and copper nitrate one or more...

Embodiment 1

[0054] Weigh 5 mmol of copper sulfate and dissolve it in 50 mL of deionized water, and use dilute sulfuric acid to adjust the pH of the solution to 2 as the electroplating solution. Immerse the surface-hydrophilized gas diffusion carbon paper, Ag / AgCl (saturated KCl) reference electrode and carbon rod in the electroplating solution, and apply a bias of -0.7V (vs.Ag / AgCl) to the cathode for constant potential deposition , the deposition time is 700s, and the deposition area is 1cm×1cm. After the deposition, the surface of the electrode was rinsed three times with deionized water and twice with ethanol, and then dried in vacuum for 6 hours to obtain a dendritic copper electrode with a hydrophobic surface. The copper layer deposited on the surface of the copper electrode had a thickness of about 17 μm. The amount is 2.75mg / cm 2 .

[0055] Utilize scanning electron microscope to carry out morphology observation to the copper electrode prepared in this embodiment, obtain its scan...

Embodiment 2

[0059] Weigh 5 mmol of copper sulfate and dissolve it in 50 mL of deionized water, and use dilute sulfuric acid to adjust the pH of the solution to 2 as the electroplating solution. Immerse the surface-hydrophilized gas diffusion carbon paper, Ag / AgCl (saturated KCl) reference electrode and carbon rod in the electroplating solution, and apply a bias of -0.7V (vs.Ag / AgCl) to the cathode for constant potential deposition , the deposition time is 100s, and the deposition area is 1cm×1cm. After the deposition, the surface of the electrode was rinsed 3 times with deionized water, 2 times with ethanol, and then dried in vacuum for 6 hours to obtain a dendritic copper electrode with a hydrophobic surface. The copper layer deposited on the surface of the copper electrode had a thickness of about 2.5 μm. The deposition amount is 0.40mg / cm 2 .

[0060] Utilize scanning electron microscope to analyze the copper electrode that present embodiment prepares, obtain its scanning electron mi...

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Abstract

The invention belongs to the technical field of electrocatalysis, and particularly relates to a dendritic copper electrode with a hydrophobic surface and a preparation method and application thereof.The copper electrode provided by the invention comprises a gas diffusion layer and a copper layer deposited on the surface of the gas diffusion layer, and the microstructure of the copper layer is dendritic. The surface of the copper electrode is composed of regular copper dendrites, so that good hydrophobicity is shown and excessive contact of electrolyte can be effectively prevented, and therebyflooding of the electrode is avoided, and the stability of the electrode is improved; in addition, the dendritic copper can efficiently enrich cations in the electrolyte to form a local high electricfield, so that the carbon-carbon coupling rate is increased, and the electrode shows excellent electro-catalytic CO2 reduction activity.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a dendritic copper electrode with a hydrophobic surface and a preparation method and application thereof. Background technique [0002] Since the industrial revolution, the excessive exploitation and use of fossil fuels has not only led to a tense energy crisis, but also caused the CO in the atmosphere to 2 The concentration rises rapidly, which brings about a series of global climate changes, such as accelerated global warming and sea level rise. It is generally believed that the use of renewable energy such as solar energy and wind energy to drive the electrocatalytic CO 2 Reverting to high value-added chemicals can effectively alleviate energy and environmental issues. The electrocatalytic reaction conditions are mild, the energy utilization efficiency is high, and it is easy to be scaled up industrially. 2 It is the most promising transformation techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25D3/38C25B3/04C25D5/54C25B3/25
CPCC25D3/38C25D5/54
Inventor 高敏锐牛壮壮高飞跃杨朋朋
Owner UNIV OF SCI & TECH OF CHINA
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