Mechanism of Li Ion Desolvation at the Interface of Graphite Electrode and Glyme–Li Salt Solvate Ionic Liquids

Heejoon Moon, Ryoichi Tatara, Toshihiko Mandai, Kazuhide Ueno, Kazuki Yoshida, Naoki Tachikawa, Tomohiro Yasuda, Kaoru Dokko, Masayoshi Watanabe

J. Phys. Chem. C2014118 (35), pp 20246–20256.    DOI: 10.1021/jp506772f

Li+ intercalation into graphite electrodes was investigated in electrolytes consisting of triglyme (G3) and Li[TFSA] (TFSA = bis(trifluoromethanesulfonyl)amide). Li+-intercalated graphite was successfully formed in an equimolar molten complex, [Li(G3)1][TFSA].

Protic Ionic Liquids and Salts as Versatile Carbon Precursors

Shiguo Zhang, Muhammed Shah Miran, Ai Ikoma, Koru Dokko and Masayoshi Watanabe

J. Am. Chem. Soc.2014136, 1690–1693. DOI: 10.1021/ja411981c

Instead of traditional polymer precursors and complex procedures, easily prepared and widely obtainable nitrogen-containing protic ionic liquids and salts were explored as novel, small-molecule precursors to prepare carbon materials (CMs) via direct carbonization without other treatments. Depending on the precursor structure, the resultant CMs can be readily obtained with a relative yield of up to 95.3%, a high specific surface area of up to 1380 m2/g, or a high N content of up to 11.1 wt%, as well as a high degree of graphitization and high conductivity (even higher than that of graphite). One of the carbons, which possesses a high surface area and a high content of pyridinic N, exhibits excellent electrocatalytic activity toward the oxygen reduction reaction in an alkaline medium, as revealed by an onset potential, half-wave potential, and kinetic current density comparable to those of commercial 20 wt% Pt/C. These low-cost and versatile precursors are expected to be important building blocks for CMs.

Research Group on Macromolecular Electrochemistry