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Amalgam electrode, method for manufacturing same, and method for electrochemical reduction of carbon dioxide using same

An amalgam electrode, carbon dioxide technology, applied in the direction of electrodes, electrode coatings, electrode shapes/types, etc., can solve problems such as inapplicability, and achieve the effect of large surface area

Active Publication Date: 2016-07-13
IND UNIV COOP FOUND SOGANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing an amalgam electrode by curing after mixing as described above (see Korean Patent No. 1324742) has the problem that it cannot be applied by forming mercury on the surface of electrodes having various shapes (such as the surface of a porous electrode). Let's make electrodes

Method used

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  • Amalgam electrode, method for manufacturing same, and method for electrochemical reduction of carbon dioxide using same
  • Amalgam electrode, method for manufacturing same, and method for electrochemical reduction of carbon dioxide using same
  • Amalgam electrode, method for manufacturing same, and method for electrochemical reduction of carbon dioxide using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Porous amalgam electrode in which the Ag-Sn layer is formed after the Hg layer is formed

[0053] The mesh-like porous copper electrode was immersed in 10 mMHg(NO 3 ) 2 solution, then pass 8mA / cm 2 constant current reduction to form a Hg layer by electroplating Hg on the surface of the porous copper electrode. An electrode comprising a very thin layer of Hg thereon was placed in a solution containing 0.2 MSC (NH 2 ) 2 and 2MH 2 SO 4 20mMSnSO as electrolyte 4 / 2mMAg 2 SO 4 in solution. Then, apply 10mA / cm to it 2 A constant current followed by electroplating the Ag-Sn layer. In this case, a plate-shaped Sn electrode is used as a counter electrode. After about 1 day, the amalgamation reaction of Hg and Ag-Sn was observed to take place and form a hard solid electrode. Figure 1a A schematic diagram illustrating a method of manufacturing a porous amalgam electrode according to the present embodiment is shown.

Embodiment 2

[0054] Example 2: Porous amalgam electrode in which a Hg layer is formed after forming an Ag-Sn layer

[0055] Dip the mesh porous copper electrode into the solution containing 0.2MSC(NH 2 ) 2 and 2MH 2 SO 4 20mMSnSO as electrolyte 4 / 2mMAg 2 SO 4 in solution. Then apply 10mA / cm to it 2 constant current to first form Ag 3 Ag-Sn layer of Sn. In this case, a plate-shaped Sn electrode is used as a counter electrode. The electrode comprising an Ag-Sn layer thereon was placed in 10 mMHg (NO 3 ) 2 solution, and then, through 8mA / cm 2 The constant current reduction followed by electroplating the Hg layer. Over time, an amalgamation reaction of Hg and Ag-Sn was observed to occur and form a porous amalgam electrode. Figure 1b A schematic diagram illustrating a method of producing a porous amalgam electrode according to the present embodiment is shown.

Embodiment 3

[0056] Example 3: Electrochemical reduction of carbon dioxide using a porous amalgam electrode

[0057] The porous amalgam electrode prepared in Example 1 was used for the electrochemical reduction of carbon dioxide. Specifically, use 0.5MK 2 SO 4 solution, a porous amalgam electrode, and an IrOx-coated Ti electrode (counter electrode). The constant current circuit KSRnD10A is used to have a 9cm 2 A constant current is applied to the apparent area of ​​the porous amalgam electrode. Then, the efficiency (current efficiency) and duration of formate generation were observed.

[0058] (1) Apply 40mA / cm 2 The situation of the current

[0059] After applying 40 mA / cm to the porous amalgam electrode according to Example 1 2 In the case of a constant current, it was observed that a voltage of about 3.6 V was applied to both ends and the conversion efficiency to formate was as high as about 90% for about 21 h. The result is in figure 2 shown in . In addition, the concentrati...

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Abstract

The present invention relates to a method for manufacturing an amalgam electrode, an amalgam electrode manufactured by the method, and a method for electrochemical reduction of carbon dioxide using the amalgam electrode.

Description

technical field [0001] The present invention relates to a method for preparing an amalgam electrode, an amalgam electrode prepared by the method and a method for electrochemically reducing carbon dioxide using the amalgam electrode. Background technique [0002] Amalgam is an alloy of mercury and another metal. This amalgam has the electrode activity of mercury and is capable of forming a solid phase. Therefore, studies using amalgam as an electrode material have been conducted. Generally, silver amalgam has been utilized in many cases. Recently, the application of dental amalgam to the electrochemical reduction of carbon dioxide has been reported. In all these cases, when preparing an amalgam electrode, a method of mixing metal powder and mercury into a dough at high speed using an amalgamator and then placing and solidifying the dough in a mold having a predetermined shape (amalgam chemical reaction). In particular, dental amalgam is prepared by mixing mercury with am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/18C25B11/03C25B3/25
CPCC25D3/60C25D3/64C25B11/02C25D3/30C25D3/54C25D5/10C25D7/00C25B3/25C25B11/031C25B11/045C25B11/03C25D3/46
Inventor 申运燮朴美贞
Owner IND UNIV COOP FOUND SOGANG UNIV
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