슈퍼커패시터용 금속산화물-탄소섬유 복합 전극 소재의 제조 및 특성 = Fabrication and Characterization of Metal Oxide-Carbon Cloth Composite Electrodes for Supercapacitors

다국어 초록 (Multilingual Abstract)

For supercapacitor applications, metal oxide-carbon cloth composite electrodes were synthesized using a Sol-Gel dipping process. Firstly, the effect of argon (Ar) plasma surface treatment on carbon cloth was investigated to enhance substrate wettability for uniform metal oxide coating, giving rise to improve the electrochemical performance of metal oxide–based supercapacitor electrodes.
The influence of Ar plasma pretreatment was evaluated by comparing plasma-treated and untreated carbon cloth electrodes. Following plasma activation, metal oxide sol solutions were deposited via a dip-coating process and subsequently calcined to fabricate the electrodes. Electrochemical evaluations revealed that plasma-treated electrodes exhibited enhanced coating uniformity and significantly improved electrochemical performance compared to untreated counterparts.
Subsequently, manganese–cobalt (Mn–Co) oxide composite electrodes were prepared on plasma-treated carbon cloth under identical fabrication conditions, with calcination temperatures of 300°C and 400°C.
The Mn:Co molar ratio in the sol solutions was systematically varied to optimize electrochemical properties. Uniform Mn–Co oxide composite layers were successfully formed, and the effects of calcination temperature and metal composition on the structural and electrochemical characteristics were comprehensively analyzed.
Cyclic stability tests demonstrated excellent durability, with the plasma-treated AP-Mn–O@CC and AP-Co–O@CC electrodes retaining approximately 119.57% and 88.89% of their initial capacitance, respectively, after prolonged charge–discharge cycling. Notably, the Mn–Co composite electrode with a Mn:Co ratio of 2:1 calcined at 400°C exhibited the highest specific capacitance of 355.68 F/cm² and an energy density of 382.56 Wh/kg, confirming its superior electrochemical performance and stability.

목차 (Table of Contents)

• (Abstract)
• Ⅰ. 서론 1
• 1.1 웨어러블 기기 확산과 플랙시블 에너지 저장장치의 요구 1
• 1.2 슈퍼커패시터의 분류 3
• 1.2.1 Electrochemical double-layer capacitors (EDLCs) 5
• 1.2.2 Pseudocapacitors 7
• 1.2.3 Hybrid capacitors 9
• 1.3 슈퍼커패시터용 전극 소재 11
• 1.3.1 탄소섬유 12
• 1.3.2 금속 산화물 13
• Ⅱ. 연구목적 14
• Ⅲ. 실험 16
• 3.1 탄소섬유 표면 상의 플라즈마 전처리의 영향 16
• 3.1.1 실험개요 16
• 3.1.2 시약구매 17
• 3.1.3 금속 Sol 용액 합성 18
• 3.1.4 탄소섬유 표면처리 18
• 3.1.5 Dip-coating 18
• 3.1.6 Working Electrodes 제조 19
• 3.1.7 특성 분석 19
• 3.1.8 전기화학적 특성 평가 20
• 3.2 망간 코발트 산화물-탄소 섬유 복합 전극소재 21
• 3.2.1 실험개요 21
• 3.2.2 시약구매 22
• 3.2.3 금속 Sol 용액 합성 23
• 3.2.4 탄소섬유 표면처리 23
• 3.2.5 Dip-coating 23
• 3.2.6 Working Electrodes 제조 24
• 3.2.7 특성 분석 24
• 3.2.8 전기화학적 특성 평가 25
• Ⅳ. 결과 및 논의 26
• 4.1 탄소섬유 표면 상의 플라즈마 전처리의 영향 26
• 4.1.1 접촉각 결과 26
• 4.1.2 SEM 및 EDS 결과 28
• 4.1.3 XRD 결과 32
• 4.1.4 XPS 결과 34
• 4.1.5 FT-IR 결과 35
• 4.1.6 Cyclic voltammograms (CV) 결과 36
• 4.1.7 Galvanostatic Charge-Discharge(GCD) 결과 38
• 4.1.8 Cyclic performance 결과 41
• 4.1.9 Electrochemical impedance spectroscopy (EIS) 결과 42
• 4.2 망간 코발트 산화물/탄소섬유 복합 전극 제조 43
• 4.2.1 SEM 및 EDS 결과 43
• 4.2.2 XRD 결과 48
• 4.2.3 XPS 결과 50
• 4.2.4 FT-IR 결과 54
• 4.2.5 Cyclic voltammograms (CV) 결과 55
• 4.2.6 Galvanostatic Charge-Discharge(GCD) 결과 57
• 4.2.7 Cyclic performance 결과 60
• 4.2.8 Electrochemical impedance spectroscopy (EIS) 결과 62
• Ⅴ. 결론 63
• Ⅵ. 참고 문헌 65