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KR-20260063043-A - PLASMONIC ELECTROCATALYST FOR AQUEOUS AND FLEXIBLE METAL-AIR BATTERY AND METHOD OF PREPARING THE SAME

KR20260063043AKR 20260063043 AKR20260063043 AKR 20260063043AKR-20260063043-A

Abstract

The present invention relates to a plasmonic electrode catalyst for a metal-air battery and a method for manufacturing the same.

Inventors

  • 김동하
  • 김정원

Assignees

  • 이화여자대학교 산학협력단

Dates

Publication Date
20260507
Application Date
20241030

Claims (13)

  1. A perovskite oxide represented by the following chemical formula 1; and A plasmonic electrode catalyst for a metal-air battery comprising plasmonic particles formed on the surface of the above-mentioned perovskite oxide, Plasmonic electrode catalyst for metal-air batteries, wherein the above perovskite oxide is in the form of nanofibers: [Chemical Formula 1] A (1-x) B x C (1-y) C' y O 3-δ , In the above chemical formula 1, A is Sr, La, Pr, or Ba, and B is Ag, Au, Pt, Mg, or Cu, and C and C' are Nb, Co, Fe, Mn, or Ni, respectively, and x is 0.01 to 0.1, and y is 0.01 to 1.
  2. In Article 1, A plasmonic electrode catalyst for a metal-air battery, wherein the above-mentioned nanofiber form includes a hollow structure.
  3. In Article 1, A plasmonic electrode catalyst for a metal-air battery, wherein the plasmonic particle comprises B of Chemical Formula 1.
  4. In Article 1, A plasmonic electrode catalyst for a metal-air battery, wherein the average diameter of the plasmonic particles is 10 nm to 100 nm.
  5. An electrode for a metal-air battery comprising a plasmonic electrode catalyst for a metal-air battery according to claim 1.
  6. A metal-air battery comprising an electrode for a metal-air battery according to claim 5.
  7. In Article 6, The above metal-air battery is a flexible battery, a metal-air battery.
  8. In Article 6, The metal-air battery is a zinc-air battery, a lithium-air battery, an aluminum-air battery, or a magnesium-air battery.
  9. Mixing a perovskite precursor, a polymer, and a solvent to obtain a polymer solution; Obtaining polymer nanofibers from the above polymer solution using an electrospinning process; Calcining the above polymer nanofibers to obtain perovskite oxide nanofibers; and Heat-treating the above perovskite oxide nanofibers to form plasmonic particles on the surface A method for manufacturing a plasmonic electrode catalyst for a metal-air battery, comprising: A method for manufacturing a plasmonic electrode catalyst for a metal-air battery, wherein the perovskite oxide is represented by the following chemical formula 1. [Chemical Formula 1] A (1-x) B x C (1-y) C' y O 3-δ , In the above chemical formula 1, A is Sr, La, Pr, or Ba, and B is Ag, Au, Pt, Mg, or Cu, and C and C' are Nb, Co, Fe, Mn, or Ni, respectively, and x is 0.01 to 0.1, and y is 0.01 to 1.
  10. In Article 9, A method for manufacturing a plasmonic electrode catalyst for a metal-air battery, wherein the plasmonic particles include B of Chemical Formula 1.
  11. In Article 9, A method for manufacturing a plasmonic electrode catalyst for a metal-air battery, wherein the above electrospinning process is performed in a voltage range of 10 kV to 20 kV.
  12. In Article 9, A method for manufacturing a plasmonic electrode catalyst for a metal-air battery, wherein the above-mentioned polymer nanofibers are calcined at a temperature range of 700°C to 1300°C.
  13. In Article 9, A method for manufacturing a plasmonic electrode catalyst for a metal-air battery, wherein the heat treatment of the perovskite oxide nanofiber is performed in a temperature range of 200°C to 500°C.

Description

Plasmonic Electrocatalyst for Aqueous and Flexible Metal-Air Batteries and Method of Preparing the Same The present invention relates to a plasmonic electrode catalyst for a metal-air battery and a method for manufacturing the same. Zinc-air batteries are receiving significant attention as next-generation batteries because they theoretically have a higher energy density compared to existing commercial batteries, and utilize environmentally friendly and inexpensive materials. A zinc-air battery consists of an air electrode (anode), a separator, an electrolyte, and a negative electrode; the air electrode is composed of a double-layer structure consisting of a catalyst layer and a gas diffusion layer. The catalyst layer supports an anode catalyst that activates oxygen reduction and oxygen generation reactions (oxygen oxidation reactions), while the gas diffusion layer provides a flow path for external air. Since the oxygen reduction and oxygen generation reactions occurring at the anode proceed much more slowly than the oxidation rate at the negative electrode, the reaction in the zinc-air battery depends on the rate of the oxygen reduction reaction at the anode. Accordingly, research is continuously being conducted to improve the performance of the anode catalyst where these reactions take place. Furthermore, the oxidation/reduction reactions at the negative electrode proceed at approximately -1.25 V, while the oxygen reduction and oxidation reactions at the anode proceed at approximately +0.4 V. During battery charging, the voltage difference between the oxygen evolution reaction and the carbon corrosion reaction is only about 0.12 V, so there is a possibility that side reactions other than the oxygen evolution reaction may proceed. Therefore, in order to produce a highly stable and high-performance battery, a catalyst that is good for both the oxygen reduction reaction and the oxygen generation reaction must be utilized. FIG. 1 shows a schematic diagram of the synthesis process of nanofiber perovskite oxide (a), scanning electron microscopy (SEM) images (b and c), transmission electron microscopy (TEM) images (d and e), and energy-dispersive X-ray spectroscopy (EDS) analysis results (f and g) of nanofiber perovskite oxide in one embodiment of the present invention. FIG. 2 shows the results of the oxygen reduction reaction (ORR) (a to c) and oxygen evolution reaction (OER) (d to f) performance evaluation of the electrode of the present invention in one embodiment of the present invention, the overpotential measurement results (g), the electrochemical surface area (ECSA) analysis results (h), and the plasmonic phenomenon results (i). FIG. 3 shows, in one embodiment of the present invention, a schematic diagram of a zinc-air battery (a), an open circuit voltage (OCV) graph (b), current-voltage measurement results (c), current density under various voltage conditions (d), current-voltage measurement results (e), charge-discharge test results (f), and energy efficiency change during charge-discharge cycles (g). FIG. 4 shows, in one embodiment of the present invention, a schematic diagram (a) of a flexible zinc-air battery, a photograph and a photograph with the LED voltage turned on (b), a graph of the open circuit voltage (OCV) of the flexible zinc-air battery (c), current-voltage analysis results (d and e), a change in performance according to the degree of bending (f), and a change in energy efficiency during charge-discharge cycles (g). Hereinafter, embodiments and examples of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments and examples described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals. Throughout this specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "electrically connected" with other elements interposed between them. Throughout this specification, when a component is described as being located "on" another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components. Throughout 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. Terms of degree used in this specification, such as “about,” “substantially,” etc., are used to mean at or near the stated value when inherent manufacturing and material tolerances