저에너지 전자빔을 이용한 연료전지용 백금 촉매 제조 기술 개발 및 전기화학적 특성 연구 = Development of platinum catalyst synthesis technology for fuel cells using low energy electron beam and study of their electrochemical properties

다국어 초록 (Multilingual Abstract)

Recently, major countries such as Europe, the United States, and China trend to reduce carbon emission by increasing the use of renewable energy. Hydrogen energy is one of the most important renewable energy sources because it generates a higher energy density than solar power, wind power, and hydropower energy. This hydrogen energy can be used in a polymer electrolyte fuel cell (PEMFC) which can power electric vehicles or factories. A PEMFC stack for automobiles is composed of repeatedly stacking hundreds of membrane-electrode assemblies (MEAs), gas diffusion layers (GDLs), and separators. The most important component in determining the price, life, and performance of a fuel cell vehicle is MEA. Usually, MEA is manufactured by coating platinum (Pt) catalysts on both sides of an electrolyte membrane. The Pt catalysts cost about 50 % of the fuel cell stack price. In order to reduce the price of fuel cell vehicles and commercialize them, an innovative technique for Pt nanoparticles production is required. This study proposes the Electron Beam (EB) irradiation method to synthesize the Pt catalysts for PEMFC. This method uses a low-energy electron beam to irradiated the Pt solutions to produce Pt nanoparticles. In this technique, we can control the dispersion and size of Pt catalysts using dispersant and OH radical scavenger. By systematically controlling the amount of dispersant and radical scavenger, we found suitable conditions for synthesizing Pt nanoparticles for PEMFCs applications with small size particles and good dispersion. Thus, with this technique, the mass production of Pt catalysts can be achieved.

목차 (Table of Contents)

• 1. 서론 1
• 2. 이론적 배경 6
• 2.1. 연료전지 종류 및 기본원리 6
• 2.1.1. PEM (고분자 전해질) 연료전지 8
• 2.2. 화학적 합성방법 10
• 2.3. 전자빔 발생장치 기본원리 11
• 3. 실험 방법 15
• 3.1. 촉매 합성 15
• 3.2. 물리적 특성 분석 17
• 3.3. 전기화학적 특성 분석 19
• 4. 결과 및 고찰 21
• 4.1. 촉매 합성 특성 분석 21
• 4.2. 분산제 및 라디칼 스캐빈저 첨가 특성 분석 23
• 4.2.1. Pt/C 촉매의 입자 분포 분석 23
• 4.2.2. Pt/C 촉매의 입자 크기 및 구조 분석 28
• 4.2.3. Pt/C 촉매의 입자 열분석 35
• 4.2.4. Pt/C 촉매의 전기화학 평가 39
• 5. 결론 46