System for electrochemical of carbon dioxide

Patent metadata

Field	Value
Publication number	US-10947628-B2
Application number	US-201916250569-A
Country	US
Kind code	B2
Filing date	Jan 17, 2019
Priority date	Jul 20, 2016
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The present disclosure provides a system for electrochemical conversion of carbon dioxide, including: a reduction electrode unit to which carbon dioxide is supplied and including a metal-containing electrode; an oxidation electrode unit including a sacrificial electrode; and an electrolyte unit including an aprotic polar organic solvent and an auxiliary electrolyte, which is in contact with the reduction electrode unit and the oxidation electrode unit, and the carbon dioxide supplied to the reduction electrode unit is electrochemically reduced so as to produce an oxalate salt.

First claim

We claim:

1. A system for electrochemical conversion of carbon dioxide, comprising:
a reduction electrode unit to which carbon dioxide is supplied and including a metal-containing electrode;
an oxidation electrode unit including a sacrificial electrode; and
an electrolyte unit including dimethyl sulfoxide as an aprotic polar organic solvent and tetrabutylammonium hexafluorophosphate (TBA ·PF 6 ) as an auxiliary electrolyte, wherein the aprotic polar organic solvent and the auxiliary electrolyte completely surround both the metal-containing electrode and the sacrificial electrode,
wherein the carbon dioxide supplied to the reduction electrode unit is electrochemically reduced, at room temperature, so as to produce at the metal-containing electrode an oxalate salt having a purity of 90% or more when a constant voltage of −3.0 V to −3.2 V vs Ag/Ag + is applied to the system,
wherein the metal-containing electrode includes a member selected from the group consisting of Hg, Ag, Sn, Cu, Zn, Sb, alloys thereof, amalgam, and combinations thereof, and
wherein the sacrificial electrode is Zn.

2. The system for electrochemical conversion of carbon dioxide of claim 1 , wherein the oxalate salt is represented by the following Chemical Formula 1,
[Chemical Formula 1]
M x C 2 O 4 ;
wherein in the above Formula,
M is Zn, and
x is 1 or 2.

3. The system for electrochemical conversion of carbon dioxide of claim 1 , wherein the purity is between 90 to 99%.

4. The system for electrochemical conversion of carbon dioxide of claim 1 , wherein the purity is between 91 to 99%.

5. The system for electrochemical conversion of carbon dioxide of claim 1 , wherein the purity is between 92 to 98%.

6. The system for electrochemical conversion of carbon dioxide of claim 1 , wherein the purity is between 94 to 96%.

Assignees

• Univ Sogang Res & Business Development Found

Inventors

• Shin Woonsup
• Jeong Soojin
• Park Mi Jung

Classifications

• C25B3/25 Primary

  Reduction · CPC title

• C25B9/17

  Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof · CPC title

• C25B9/00 Primary

  Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features · CPC title

• C25B11/04

  characterised by the material · CPC title

• C25B11/045

  Mercury or amalgam · CPC title