KR-20260067935-A - Method for doping nonmetal ions of oxide cathode material for fuel cell and solid oxide fuel cell comprising the same

KR20260067935AKR 20260067935 AKR20260067935 AKR 20260067935AKR-20260067935-A

Abstract

The present invention relates to a method for doping non-metal ions into an oxide air electrode material for a fuel cell and to a solid oxide fuel cell comprising an oxide air electrode material prepared thereby. More specifically, the invention relates to a method for doping non-metal ions into an oxide air electrode material for a fuel cell having excellent electrochemical properties by doping non-metal ions into the crystal structure of the oxide air electrode material through a topotatic reaction, and to a solid oxide fuel cell comprising an oxide air electrode material prepared thereby.

Inventors

정우철
김현승
남성우

Assignees

서울대학교산학협력단

Dates

Publication Date: 20260513
Application Date: 20241204
Priority Date: 20241106

Claims (8)

A step of positioning a polymer-based precursor containing non-metallic ions and an oxide air electrode material spaced apart within a container; A step of placing the above container inside a furnace; A step of heating the furnace to generate a gas containing non-metal ions from the polymer-based precursor; and A method for doping non-metal ions in an oxide air electrode material for a fuel cell, comprising the step of contacting a gas containing the non-metal ions with the oxide air electrode material to dope the non-metal ions into the crystal structure of the oxide air electrode material.
In paragraph 1, A method for doping non-metallic ions into an oxide air electrode material for a fuel cell, wherein the polymeric precursor containing the above non-metallic ions is polyvinyl chloride (PVC) containing chloride (Cl) ions.
In paragraph 1, A method for doping non-metal ions of an oxide air electrode material for a fuel cell, wherein the oxide air electrode material is a ceramic-based perovskite oxide.
In paragraph 3, A method for doping non-metallic ions into an oxide air electrode material for a fuel cell, wherein the ceramic-based perovskite oxide is strontium titanium ferrite (SrTi 1-x Fe x O 3-δ , STF).
In paragraph 1, A method for doping non-metal ions of an oxide air electrode material for a fuel cell, wherein the oxide air electrode material is in the form of a porous thin film.
In paragraph 1, A method for doping non-metal ions into an oxide air electrode material for a fuel cell, wherein the gas containing the above non-metal ions is hydrogen chloride (HCl).
In paragraph 1, A method for doping non-metallic ions of an oxide air electrode material for a fuel cell, wherein the heating is performed at 80 to 130 ℃ over an inert gas.
A solid oxide fuel cell comprising a non-metal ion-doped oxide air electrode material manufactured by a method according to any one of claims 1 to 7.

Description

Method for doping nonmetal ions of oxide cathode material for fuel cell and solid oxide fuel cell comprising the same The present invention relates to a method for doping non-metal ions into an oxide air electrode material for a fuel cell and to a solid oxide fuel cell comprising an oxide air electrode material prepared thereby. More specifically, the invention relates to a method for doping non-metal ions into an oxide air electrode material for a fuel cell having excellent electrochemical properties by doping non-metal ions into the crystal structure of the oxide air electrode material through a topotatic reaction, and to a solid oxide fuel cell comprising an oxide air electrode material prepared thereby. A fuel cell is a device that generates electrical energy by electrochemically reacting a fuel with an oxidant. This chemical reaction takes place within a catalyst bed via a catalyst, and generally, continuous power generation is possible as long as fuel is continuously supplied. Examples of fuel cells include molten carbonate fuel cells (MCFC), polymer electrolyte membrane fuel cells (PEMFC), direct carbon fuel cells (DCFC), and phosphoric acid fuel cells (PAFC), but the most extensive research is being conducted on solid oxide fuel cells (SOFC). Solid oxide fuel cells (SOFCs) are referred to as representative third-generation eco-friendly fuel cells capable of converting chemical energy into electrical energy with high efficiency. They are capable of reversible operation to convert electrical energy into chemical energy, thereby producing energy carriers such as green hydrogen and ammonia. These solid oxide fuel cells operate at the highest temperatures (700–1000 °C) among existing fuel cells. As mentioned above, solid oxide fuel cells operate at high temperatures of 700°C or higher, which results in high maintenance costs and can cause rapid material degradation, and have been a practical obstacle to commercialization. To solve these problems, research has been actively conducted to lower the operating temperature of solid oxide fuel cells. To lower the operating temperature of solid oxide fuel cells, research has been conducted to improve reactivity by doping the air electrodes of solid oxide fuel cells with various non-metallic ions. However, doping these non-metallic ions requires a high-temperature fabrication process, and since some of the process may be lost, precise compositional control is impossible, making it difficult to optimize the fabrication process. Therefore, in order to address the aforementioned problems, the inventors recognized the urgent need to develop a method for manufacturing a solid oxide fuel cell capable of lowering the operating temperature by easily doping non-metallic ions into the air electrode, and thus completed the present invention. FIG. 1 is a diagram schematically illustrating a method for doping non-metallic ions of an oxide air electrode material for a fuel cell according to the present invention. Figure 2 is a transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS) image for confirming non-metallic ions doped on an oxide air electrode material according to Example 1-1 of the present invention. Figure 3 is an X-ray photoelectron spectroscopy (XPS) spectrum and graph confirming the doping control ability of non-metal ions according to the content of a polymer-based precursor containing non-metal ions according to Examples 1-1 to 1-4 of the present invention. Figure 4 is a graph showing the calculated surface oxygen exchange coefficient (ks) values for an oxide air electrode material doped with non-metallic ions (Example 1-1) and an oxide air electrode material not doped with non-metallic ions (Preparation Example 1) according to the present invention. Figure 5 is a graph confirming the electrochemical performance of a half cell (Example 2) containing an oxide air electrode material doped with non-metal ions according to the present invention and a half cell not doped with non-metal ions (Preparation Example 2). Specific details for implementing the present invention will be described in detail below with reference to the attached drawings. When a part of the entire specification 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 describing the principles of a preferred embodiment of the present invention in detail, if it is determined that a specific description of related known functions or configurations could unnecessarily obscure the essence of the present invention, such detailed description is omitted. Non-metal ion doping method for oxide air electrode materials for fuel cells According to one aspect of the present invention, a method for doping non-metal ions into an oxide air electrode material for a fuel cell is provided, comprising the steps of: positioning a polymer-based precursor containing non