pH-Controlled Synthesis of Carbon Xerogels for Coin-Type Organic Supercapacitor Electrodes

Ji Chul Jung; Wonjong Jung

doi:10.3740/MRSK.2023.33.10.430

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2023 Vol.33, Issue 10 Preview Page

Research Paper

pH-Controlled Synthesis of Carbon Xerogels for Coin-Type Organic Supercapacitor Electrodes pH를 조절하여 제조한 카본제어로젤을 이용한 코인타입 유기계 슈퍼커패시터 전극

27 October 2023. pp. 430-438

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Abstract

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.

Keywords

supercapacitor

carbon xerogel

pH control

electrochemical performance

organic electrolyte

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 33
No :10
Pages :430-438
Received Date : 2023-10-09
Revised Date : 2023-10-16
Accepted Date : 2023-10-17
DOI :https://doi.org/10.3740/MRSK.2023.33.10.430

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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