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JP-2026074588-A - Electrochemical devices

JP2026074588AJP 2026074588 AJP2026074588 AJP 2026074588AJP-2026074588-A

Abstract

[Problem] To provide an electrochemical device that can reduce energy consumption. [Solution] The electrochemical device 10 comprises an anode electrode 22 containing an anode catalyst, a first chamber 24 in which the anode electrode 22 is placed and a gas containing H2 is supplied, a cation exchange membrane 30 placed on the anode electrode 22, and a second chamber 28 adjacent to the first chamber 24 via the cation exchange membrane 30 and in which an aqueous solution containing carbonate ion species is supplied. The anode catalyst includes a first catalyst that promotes a hydrogen oxidation reaction in an acidic environment and a second catalyst that promotes an oxygen evolution reaction in an acidic environment. When a voltage is applied to the anode electrode 22, protons generated at the anode electrode 22 are supplied to the second chamber 28 through the cation exchange membrane 30 and react with the carbonate ion species. [Selection Diagram] Figure 1

Inventors

  • 西村 友作
  • 加藤 千和
  • 岡村 和政

Assignees

  • 株式会社豊田中央研究所
  • トヨタ自動車株式会社

Dates

Publication Date
20260507
Application Date
20241021

Claims (8)

  1. an anode electrode containing an anode catalyst, The anode electrode is placed in a first chamber to which a gas containing H2 is supplied, A cation exchange membrane disposed on the anode electrode, The system comprises a second chamber adjacent to the first chamber via the cation exchange membrane, to which an aqueous solution containing carbonate ion species is supplied, The anode catalyst comprises a first catalyst that promotes a hydrogen oxidation reaction in an acidic environment and a second catalyst that promotes an oxygen evolution reaction in an acidic environment. An electrochemical device characterized in that, when a voltage is applied to the anode electrode, protons generated at the anode electrode are supplied to the second chamber through the cation exchange membrane and react with the carbonate ion species.
  2. The electrochemical device according to claim 1, characterized in that the gas containing H2 is a humidifying gas containing H2 .
  3. The electrochemical device according to claim 1 or 2, characterized in that the anode electrode and the cation exchange membrane are joined together.
  4. The electrochemical device according to claim 1 or 2, characterized in that the first catalyst contains at least one element selected from the group consisting of Pt, Pd, Rh, Re, Au, and Ni.
  5. The electrochemical device according to claim 1 or 2, characterized in that the second catalyst comprises at least one selected from the group consisting of Ir oxide, Ru oxide, a mixture containing Ir oxide and Ru oxide, and a composite oxide containing Ir and Ru.
  6. The electrochemical device according to claim 1 or 2, characterized in that the first catalyst contains Pt and the second catalyst contains the Ir oxide.
  7. The electrochemical device according to claim 1 or 2, characterized in that the content of the first catalyst is 0.04 mg/ cm² or more per geometric area of the anode electrode.
  8. The electrochemical device according to claim 1 or 2, characterized in that the content of the second catalyst is 0.37 mg/ cm² or more per geometric area of the anode electrode.

Description

This invention relates to the technology of electrochemical devices. As technologies that can contribute to carbon neutralization, there is interest in electrochemical devices that utilize electrolysis technology to obtain CO2 reduction valuable products from carbonate ion species or carbon dioxide, and electrodialysis technology that recovers carbon dioxide using an alkaline aqueous solution containing carbonate ion species ( at least one of carbonate ions ( CO3 2- ) and bicarbonate ions ( HCO3- )), and separates and concentrates carbon dioxide from the recovered liquid containing carbon dioxide. In electrochemical devices, for example, protons generated at the anode electrode by applying voltage are supplied to an alkaline aqueous solution containing carbonate ion species through an ion exchange membrane, activating the carbonate ion species in the alkaline aqueous solution to produce carbon dioxide (neutral CO2 molecules), etc. In the case of electrochemical devices utilizing electrolysis technology, the generated carbon dioxide, etc., is reduced by, for example, the cathode electrode to produce CO2 -reducing valuable substances such as CO, formic acid, and ethylene alcohol. For example, Patent Documents 1 to 6 and Non-Patent Documents 1 to 3 disclose electrolysis apparatuses that produce CO2 -reducing valuable substances by applying voltage to the anode and cathode electrodes. Also, for example, Patent Document 7 and Non-Patent Documents 4 and 5 disclose electrodialysis apparatuses that separate and concentrate carbon dioxide by applying voltage to the anode and cathode electrodes. International Publication No. 2019/204938International Publication No. 2021/207857International Publication No. 2020/223804Japanese Patent Publication No. 2021-147679Japanese Patent Publication No. 2021-046576Japanese Patent Publication No. 2018-150596Patent Publication No. 5750220 David A. Vermaas and Wilson A. Smith, “Synergistic Electrochemical CO2 Reduction and Water Oxidation with a Bipolar Membrane”, ACS Energy Lett., 1, 1143-1148(2016)Tengfei Li, Eric W. Lees, Maxwell Goldman, Danielle A. Salvatore, David M. Weekes, and Curtis P. Berlinguette, “Electrolytic Conversion of Bicarbonate into CO in a Flow Cell”, Joule, 3, 1487-1497(2019)Yuguang C. Li, Geonhui Lee, Tiange Yuan, Ying Wang, Dae-Hyun Nam, Ziyun Wang, F. Pelayo Garcia de Arquer, Yanwei Lum, Cao-Thang Dinh, Oleksandr Voanyy, and Edward H. Sargent, “CO2 Electroreduction from Carbonate Electrolyte”, ACS Energy Lett., 4, 1427-1431(2019)Matthew D. Eisaman, Luis Alvarado, Daniel Larner, Peng Wang, Bhaskar Garg, and Karl A. Littau (PaloAlto Research Center), “CO2 separation using polar membrane electrodialysis”, EnergyEnviron.Sci., 4, 1319-1328(2011).Reference [8] R. Sharifian, R. M. Wagterveld, I. A. Digdaya, C. Xiang, and D. A. Vermaas, “Electrochemical carbon dioxide capture to close the carbon cycle”, Energy Environ. Sci., 14, 781-814 (2021). This is a schematic diagram showing an example of an electrochemical device according to this embodiment.This is a schematic diagram showing another example of the electrochemical device according to this embodiment.This is an exploded view of the electrochemical device used in the example.Figure 3 is a schematic diagram of an electrolytic system equipped with the electrochemical device shown.This figure shows the relationship between the applied voltage UH2O and the IrO2 content in the anode electrode, and the relationship between the voltage increase ΔUH2O and the IrO2 content.This figure shows the relationship between hydrogen utilization rate and the IrO₂ content in the anode electrode, and the relationship between the Pt content in the anode electrode and the IrO₂ content.This figure shows the relationship between the applied voltage U H2 and the IrO2 content in the anode electrode, and the relationship between the Pt content in the anode electrode and the IrO2 content.This figure shows the relationship between the difference between the applied voltage UH2O and the applied voltage UH2 and the IrO2 content in the anode electrode, and the relationship between the Pt content in the anode electrode and the IrO2 content. Embodiments of the present invention will be described below. This embodiment is an example of implementing the present invention, and the present invention is not limited to this embodiment. Figure 1 is a schematic diagram showing an example of an electrochemical device according to this embodiment. The electrochemical device 10 shown in Figure 1 can be used, for example, in an electrolysis apparatus for obtaining CO2 reduction valuable products. The electrochemical device 10 shown in Figure 1 has a first chamber 24 equipped with an anode electrode 22 and a diffusion layer 34, a cation exchange membrane 30 disposed on the anode electrode 22, a cathode electrode 26, a second chamber 28, and frame members 36a and 36b. The first chamber 24 is provided between the frame member 36a and the cation exchange membran