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: ジャーナルへの寄稿学術誌査読

2 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)12457-12465
ページ数9
ジャーナルJournal of Physical Chemistry C
124
23
DOI
出版ステータス出版済み - 6月 11 2020

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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