KR-20260065417-A - ELECTRODE COMPOSITION FOR WATER ELECTROLYSIS, ELECTRODE FOR WATER ELECTROLYSIS, WATER ELECTROLYSIS CELL INCLUDING THE SAME, AND PREPARATION METHOD THEREOF

Abstract

The present invention relates to a composition for a water electrolysis electrode, a water electrolysis electrode, and a method for manufacturing the same, comprising a nanostructured thin film carrier and a first oxygen evolution reaction catalyst supported on the carrier; a second oxygen evolution reaction catalyst; an ionomer; and a solvent.

Inventors

• 배한민

Assignees

• 현대자동차주식회사
• 기아 주식회사

Dates

Publication Date

20260508

Application Date

20241101

Claims (14)

1. A composition for a water electrolysis electrode comprising: a catalyst support including a nanostructured thin film carrier and a first oxygen evolution reaction catalyst supported on the carrier; a second oxygen evolution reaction catalyst; an ionomer; and a solvent.
2. In claim 1, A composition for a water electrolysis electrode comprising, with respect to 100 parts by weight of a nanostructured thin film carrier, 300 parts by weight or more and 900 parts by weight or less of a first oxygen evolution reaction catalyst.
3. In claim 1, A composition for a water electrolysis electrode comprising: a catalyst support, a thin-film support, an organic structure having a linear nanostructure formed on the thin-film support, and a first oxygen generation reaction catalyst supported on the organic structure.
4. In claim 1, A composition for a water electrolysis electrode, wherein the first oxygen generation reaction catalyst and the second oxygen generation reaction catalyst each independently comprise a metal oxide.
5. In claim 4, A composition for a water electrolysis electrode comprising one or more metals selected from the group consisting of iridium (Ir), rubidium (Ru), nickel (Ni), iron (Fe), cobalt (Co), platinum (Pt), and lanthanum (La).
6. In claim 1, A composition for a water electrolysis electrode comprising one or more types selected from the group consisting of a nanostructured thin film carrier, a perfluorosulfonic acid-based compound, a sulfonated polyetherketone-based compound, a polyimide-based compound, and a polyethersulfone-based compound.
7. In claim 1, A composition for a water electrolysis electrode comprising, for every 100 parts by weight of a second oxygen generation reaction catalyst, 5 parts by weight or more and 30 parts by weight or less of a catalyst support, and 10 parts by weight or more and 40 parts by weight or less of an ionomer.
8. In claim 1, A composition for a water electrolysis electrode comprising one or more solvents selected from the group consisting of alcohol-based solvents and water-based solvents.
9. A catalyst support comprising a nanostructured thin film carrier and a first oxygen evolution reaction catalyst supported on the carrier; a second oxygen evolution reaction catalyst; and an ionomer, comprising an electrode for water electrolysis.
10. In claim 9, An electrode for water electrolysis comprising, for every 100 parts by weight of a second oxygen generation reaction catalyst, 5 parts by weight or more and 30 parts by weight or less of a catalyst support, and 10 parts by weight or more and 40 parts by weight or less of an ionomer.
11. In claim 9, The above catalyst support comprises a thin-film support, an organic structure having a linear nanostructure formed on the thin-film support, and a first oxygen evolution reaction catalyst supported on the organic structure, for an electrode for water electrolysis.
12. A water electrolysis cell comprising an electrode for water electrolysis according to any one of claims 9 to 11.
13. A step (S10) of preparing an electrode composition comprising: a catalyst support comprising a nanostructured thin film carrier and a first oxygen evolution reaction catalyst supported on the carrier; a second oxygen evolution reaction catalyst; an ionomer; and a solvent; and A method for manufacturing an electrode for water electrolysis, comprising the step (S20) of coating the above electrode composition onto a release liner, drying it, and then removing the release liner.
14. In claim 13, A method for manufacturing an electrode for water electrolysis, wherein the coating of step (S20) above is selected from the group consisting of bar coating, spray coating, doctor blade coating, comma coating, slot die coating, gravure coating, lip coating, cap coating, and tape casting.

Description

ELECTRODE COMPOSITION FOR WATER ELECTROLYSIS, ELECTRODE FOR WATER ELECTROLYSIS, WATER ELECTROLYSIS CELL INCLUDING THE SAME, AND PREPARATION METHOD THEREOF The present invention relates to a composition for a water electrolysis electrode capable of improving the electrical conductivity of a manufactured electrode and preventing appearance defects, a water electrolysis electrode, a water electrolysis cell including the same, and a method for manufacturing the same. A Polymer Electrolyte Membrane (PEM) water electrolysis system is an electrochemical conversion device that uses electricity to decompose water ( H₂O ) into hydrogen ( H₂ ) and oxygen ( O₂ ). The PEM water electrolysis system has the advantages of being able to operate at high current densities, enabling the production of high-purity hydrogen and oxygen due to low gas permeability through the solid electrolyte membrane, and ensuring high stability. Such a PEM water electrolysis system consists of a PEM water electrolysis stack and peripheral devices for driving it, and the PEM water electrolysis stack is composed of a plurality of PEM water electrolysis cells. Figure 1 is a cross-sectional view of a conventional polymer electrolyte membrane (PEM) water electrolysis cell. FIGS. 2 and 7 are schematic diagrams of a catalyst support according to an embodiment of the present invention. Figures 3 and 4 are SEM images of the surface of an electrode for water electrolysis according to an embodiment of the present invention. FIG. 5 is the measurement result of the current-voltage curve (iv curve) of a unit cell including an electrode for water electrolysis according to one embodiment of the present invention. Figure 6 is the result of EIS analysis of a unit cell including an electrode for water electrolysis according to an embodiment of the present invention. In this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In this specification, when it is stated that a member is located on the "surface," "one side," "other side," or "both sides" of another member, this includes not only cases where a member is in contact with another member, but also cases where another member exists between the two members. Referring to FIG. 1, a PEM water electrolysis cell typically includes a membrane-electrode assembly (MEA) comprising an electrolyte membrane (10), an anode (20), and a cathode (30), a gas diffusion layer (GDL) (40) for the cathode, a porous transport layer (PTL) (50) for the anode, a separator (60) for the cathode, and a separator (70) for the anode. In this case, water introduced into the anode (20) through the anode separator channel (a) is supplied through the PTL (50), and hydrogen gas generated in the cathode (30) is discharged through the GDL (40) and the cathode separator channel (b). The anode (20) within such a PEM water electrolysis cell typically contains an amorphous oxygen evolution reaction catalyst. A representative example of an amorphous oxygen evolution reaction catalyst is an iridium (Ir)-based catalyst. However, iridium-based catalysts have a small average particle diameter and high surface energy. Consequently, iridium-based catalysts may experience particle aggregation, which can lead to reduced dispersibility of the catalyst within the electrode containing them, cracking, and a decrease in appearance characteristics. Furthermore, this degradation of electrode characteristics can lead to a decrease in the electrical conductivity of the electrode, thereby reducing the hydrogen generation efficiency of the water electrolysis cell containing it. Accordingly, there is a need for research and development on an electrode that can improve the hydrogen production efficiency of a water electrolysis cell containing the same by preventing the aggregation of the oxygen evolution reaction catalyst, thereby preventing appearance defects such as cracks and ensuring excellent appearance characteristics, and by having excellent electrical conductivity. composition for water electrolysis electrodes A composition for a water electrolysis electrode according to the present invention comprises a catalyst support comprising a nanostructured thin film carrier and a first oxygen evolution reaction catalyst supported on the carrier; a second oxygen evolution reaction catalyst; an ionomer; and a solvent. catalyst support The above catalyst support prevents the aggregation of the second oxygen evolution reaction catalyst, thereby preventing appearance defects such as cracks in the electrode manufactured therefrom, resulting in excellent appearance characteristics and improved electrical conductivity. For example, a catalyst support according to the present invention may include a nanostructure-containing thin film support and a first oxygen evolution reaction catalyst supported on the nanostructure of the thi