Ecklonia cava based mesoporous activated carbon for high-rate energy storage devices

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 84; pp. 393 - 399
• Main Authors: Kim, Kue-Ho, Shin, Dong-Yo, Ahn, Hyo-Jin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.04.2020; 한국공업화학회
• Subjects: Activated carbon; Ecklonia cava; Electrical double-layer capacitors; Mesoporous structure; Rate performance; 화학공학; Electrical double-layer capacitors; Ecklonia cava; Mesoporous structure; Rate performance; Activated carbon
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2020.01.027

[Display omitted] Activated carbon has received enormous global attention as an electrode material for electrical double layer capacitors (EDLCs) due to its superior electrochemical performance. But while manufacturing high-quality activated carbon as an electrode material, overcoming limitations such as depletion of raw material resources, poor high-rate performance, and cycle stability is still a significant challenge. To address these limitations, we firstly suggest a novel mesoporous activated carbon derived from ecklonia cava (Meso-ACDE) using an acid-base reaction and KOH activation processes. The optimized Meso-ACDE electrode showed a superior specific capacitance of 182Fg−1 at the current density of 0.2Ag−1 and a high-rate capacitance of 154Fg−1 at the current density of 20.0Ag−1 with an excellent cycling stability up to 2000 cycles. The enhanced electrochemical performance of the Meso-ACDE electrode was mainly attributed to the well-developed mesoporous structure with a high concentration of oxygen related functional groups, which were acquired during the activation process. Thus, we believe that the Meso-ACDE could be a promising alternative to conventional activated carbon for high-performance EDLCs.