19F Ex Situ Solid-State NMR Study on Structural Differences in Pores of Activated Carbon Series Derived from Chemical and Physical Activation Processes for EDLCs

Keiko Ideta, Doo Won Kim, Taegon Kim, Koji Nakabayashi, Jin Miyawaki, Joo Il Park, Seong Ho Yoon

研究成果: Contribution to journalArticle

抜粋

This study demonstrates the differences in the capacitive behaviors between the pore structures generated by physical and chemical activation and infiltrated electrolyte ions in the pores. Three paired samples were successfully synthesized with similar specific surface areas and average pore widths through steam activation (physical) and KOH activation (chemical) processes. Their capacitive behaviors were investigated with their effective charge (β) values through 19F ex situ solid-state NMR and electrochemical methods. Despite their similar pore characteristics, their capacitive behaviors were totally different because of the differences in their surface structures such as the edge-rich for KOH activation and basal-rich for steam activation. The KOH-activated series displayed higher capacitances and β values than those of the steam-activated series due to the existence of an edge-rich surface structure, which induced more effective charging under electrochemical polarization. Additionally, the pore development model (domain theory) through the KOH and steamactivation approaches was discussed by using the β values and chemical shifts by using this 19F ex situ solid-state NMR technique.

元の言語英語
ページ(範囲)12457-12465
ページ数9
ジャーナルJournal of Physical Chemistry C
124
発行部数23
DOI
出版物ステータス出版済み - 6 11 2020

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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