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pp.430-438
In this study, we synthesized pH-controlled resorcinol-formaldehyde (RF) gels through the polymerization of two starting materials: resorcinol and formaldehyde. The prepared RF gels were dried using an acetone substitution method, and they were subsequently carbonized under nitrogen atmosphere to obtain carbon xerogels (CX_Y) prepared at different pH (Y). The carbon xerogels were utilized as active materials for coin-type organic supercapacitor electrodes to investigate the influence of pH on the electrochemical properties of the carbon xerogels. The carbon xerogels prepared at lower pH (CX_9.5 and CX_10) exhibited sufficient particle growth, with a three-dimensional network of particles during the RF gel formation, resulting in the development of abundant mesopores. Conversely, the carbon xerogels prepared at higher pH (CX_11 and CX_12) retained densely packed structures of small particles, leading to pore collapse and low specific surface areas. Consequently, CX_9.5 and CX_10 showed high specific surface areas, and provided ample adsorption sites for the formation of electric double layers with electrolyte ions. Moreover, the three-dimensional particle network in CX_9.5 and CX_10 significantly enhanced electrical conductivity. The presence of well-developed mesopores in these materials further facilitated the effective transport of electrolyte ions, contributing to their superior performance as organic supercapacitor electrodes. This study confirmed that pH-controlled carbon xerogels are one of the promising active materials for organic supercapacitor electrodes. Furthermore, we concluded that pH during RF gel formation is a crucial factor determining the electrode performance of the carbon xerogels, highlighting the need for precise pH control to obtain high-performance carbon xerogel electrodes.
2. 실험 방법
2.1. pH를 조절하여 RF gel 제조
2.2. 카본제어로젤 제조
2.3. 특성분석
2.4. 카본제어로젤 전극 제조
2.5. 코인타입 슈퍼커패시터 조립과 전기화학적 특성평가
3. 결과 및 고찰
3.1. 카본제어로젤의 비표면적과 기공 특성
3.2. RF gel의 구조 형성 과정
3.3. pH가 RF gel과 카본제어로젤 구조형성에 미치는영향
3.4. pH를 조절하여 제조한 카본제어로젤 전극의 슈퍼커패시터 용량
4. 결 론
Acknowledgement
