귤껍질 폐기물 업사이클링을 통한 산소 환원 반응용 무금속 전기화학촉매의 개발

다국어 초록 (Multilingual Abstract)

Upcycling of Mandarin Peel Waste into Metal-free Electrocatalysts for Oxygen Reduction Reaction Nayeon Lee Department of Chemistry, Kyung Hee University With the growing global energy demand, the world's reliance on fossil fuels has continuously increased. This dependence has intensified significant environmental challenges, underscoring the importance of waste reduction and a shift toward renewable energy sources. Among various waste management strategies, waste upcycling is considered one of the most promising strategies. The effective recycling of agricultural by-products for developing metal-free carbon-based catalysts derived from waste materials offers an environmentally friendly, efficient, and promising approach. In line with this trend, the development of waste-derived ORR catalysts offers a dual solution to waste management and energy concerns. These catalysts can serve as sustainable alternatives to traditional Pt-group metal catalysts and can be applied in zinc- air batteries (ZABs) of fuel cells that can leverage the efficient ORR capabilities. In this research, we focused on upcycling mandarin peel waste (MPW) from bio-waste, which accounts for over 60,000 tons of waste annually in South Korea. We present a nitrogen-doped, metal-free carbon-based electrocatalyst to address waste management and sustainable energy needs. The synthesized MPW-based catalyst demonstrates its potential as an ORR catalyst suitable for energy storage systems, addressing waste treatment challenges and contributing to environmental problem-solving. The optimized MPW catalyst demonstrated high ORR performance, attributed to enhanced oxygen accessibility to the active sites facilitated by its high porosity. Durability and stability were validated through an accelerated stability test (AST) over 40,000 cycles. Furthermore, the catalyst exhibited excellent stability for more than 12 hours in a single-cell test. We believe this catalyst holds great potential as an effective ORR catalyst for the air electrode in ZAB.

목차 (Table of Contents)

• 제1 장 서론 1
• 1.1 연구 배경 및 연구 동향 1
• 1.1.1 연구 배경 1
• 제2 장 실험 8
• 2.1 시약 및 기기 8
• 2.1.1 시약 8
• 2.1.2 분석 기기 9
• 2.2 실험 방법 10
• 2.2.1 귤껍질 폐기물 기반 촉매의 합성 및 전극의 제작 10
• 2.2.2 전기화학적 성능 및 장기안정성 평가 11
• 제3 장 결과 및 고찰 15
• 3.1 촉매 표면 분석 15
• 3.2 전기화학적 성능 평가 22
• 3.2.1 촉매 제작 조건 및 로딩량 최적화 22
• 3.2.2. 산소 환원 반응 성능 및 장기 안정성 평가 27
• 3.2.3. 단위 셀 테스트 35
• 제4 장 결론 37
• 참고문헌 39