아연-공기 배터리의 안정성 향상을 위한 탄소로 둘러싸인 PdCrMnO 삼원계 금속 촉매의 합성 및 특성 분석 = Carbon-encircled PdCrMnO trimetal electrocatalyst enabling enhanced stability in zinc-air batteries

다국어 초록 (Multilingual Abstract)

Dependence on fossil fuels has resulted in energy crises and environmental degradation. therefore, advancements in energy conversion and storage technologies are essential for the efficient utilization of renewable electricity. One of the promising technologies is zinc–air batteries (ZABs) that have attracted increasing attention in recent decades due to their low cost, high safety, environmental compatibility, and high theoretical energy density. The efficient operation of zinc–air batteries critically depends on the development of highly efficient oxygen reduction reaction (ORR) electrocatalysts with exceptional durability. Therefore, in this study, we fabricated trimetal oxide PdCrMnO to improve ORR performance and increase durability in ZAB application. Characterization results show that the catalyst demonstrated polyhedron-like morphology with sharp crystalline domains. Prepared catalyst PdCrMnO performed very good ORR performance, showing Eonset and E1/2 values of 0.81 V and 0.74 V, respectively. Its overpotential is lower than other prepared catalysts (62 mV dec-1). PdCrMnO-based ZAB showed open circuit potential and power density 1.46 V and 217.8 mW-2, respectively. Noticeably, charge-discharge cycles lasted over 65 h, overperforming Pt-C+IrO2. Overall results suggested that synthesized PdCrMnO catalyst is highly efficient in energy storage applications.

목차 (Table of Contents)

• 제 1장 서 론 1
• 1. 1 금속-공기전지의 배경 및 연구 필요성 1
• 1. 2 Zn-공기전지의 작동 원리 2
• 1. 3 Zn-공기전지용 전기화학 촉매의 종류 4
• 1. 4 산소환원반응(ORR) 8
• 1. 5 Pd-Mn-Cr기반 Trimetal Oxide 촉매의 개발 필요성 11
• 제 2장 실험 13
• 2. 1 시약 및 재료 13
• 2. 2 실험 방법 13
• 2. 2. 1 PdCrMn/C 촉매 합성 13
• 2. 2. 2 Mn/C 촉매 합성 13
• 2. 2. 3 CrMn/ 촉매 합성 14
• 2. 3 특성 분석 15
• 2. 3. 1 High-Resolution X-Ray Diffractometer, HR-XRD 15
• 2. 3. 2 High-Performance 3D Imaging RAMAN Spectrocopy, RAMAN 15
• 2. 3. 3 Field Emission Scanning Electron Microscopes, FE-SEM 15
• 2. 3. 4 CS_corrected-Field Emission Transmission Electron Microscope/STEM, Cs_corrected-FE-TEM/STEM 16
• 2. 3. 5 Hybrid- X-ray photoelectron spectrometer system, Hybrid XPS system 16
• 2. 3. 6 Surface Area & Pore size Analyzer, BET & BJH 16
• 2. 4 전기화학적 특성 분석 16
• 2. 4. 1 전극제조 16
• 2. 4. 2 Oxygen reduction reaction, ORR 17
• 2. 4. 3 Zinc-air battery(ZAB) 성능평가 17
• 제 3장 결과 및 고찰 19
• 3. 1 형태학 분석 19
• 3. 2 전기화학 분석 34
• 3. 3 Zin air battery performance 41
• 제 4장 결론 45
• 참 고 문 헌 47