Search

Your search keyword '"Yoshii, Takeharu"' showing total 15 results
Start Over Author "Yoshii, Takeharu" Search Limiters Full Text
15 results on '"Yoshii, Takeharu"'

7. Preface for ITICAT2023

Author

Li, Hongjiao, primary, Yoshii, Takeharu, additional, Zhang, Cuijuan, additional, Kawi, Sibudjing, additional, and Li, Yongdan, additional

Published
2024
Full Text
View/download PDF

9. Prominent structural dependence of quantum capacitance unraveled by nitrogen-doped graphene mesosponge

Author

Tang, Rui, Aziz, Alex, Yu, Wei, Pan, Zheng-Ze, Nishikawa, Ginga, Yoshii, Takeharu, Nomura, Keita, Taylor, Erin E, Stadie, Nicholas P, Inoue, Kazutoshi, Kotani, Motoko, Kyotani, Takashi, Nishihara, Hirotomo, Tang, Rui, Aziz, Alex, Yu, Wei, Pan, Zheng-Ze, Nishikawa, Ginga, Yoshii, Takeharu, Nomura, Keita, Taylor, Erin E, Stadie, Nicholas P, Inoue, Kazutoshi, Kotani, Motoko, Kyotani, Takashi, and Nishihara, Hirotomo

Abstract

Porous carbons are important electrode materials for supercapacitors. One of the challenges associated with supercapacitors is improving their energy density without relying on pseudocapacitance, which is based on fast redox reactions that often shorten device lifetimes. A possible solution involves achieving high total capacitance (Ctot), which comprises Helmholtz capacitance (CH) and possibly quantum capacitance (CQ), in high-surface carbon materials comprising minimally stacked graphene walls. In this work, a templating method is used to synthesize 3D mesoporous graphenes with largely identical pore structures (≈2100 m2 g−1 with an average pore size of ≈7 nm) but different concentrations of oxygen-containing functional groups (0.3–6.7 wt.%) and nitrogen dopants (0.1–4.5 wt.%). Thus, the impact of the heteroatom functionalities on Ctot is systematically investigated in an organic electrolyte excluding the effect of pore structures. It is found that heteroatom functionalities determine Ctot, resulting in the cyclic voltammetry curves being rectangular or butterfly-shaped. The nitrogen functionalities are found to significantly enhance Ctot owing to increased CQ.

Published
2024

11. Edge‐Site‐Free and Topological‐Defect‐Rich Carbon Cathode for High‐Performance Lithium‐Oxygen Batteries

Author

Yu, Wei, primary, Yoshii, Takeharu, additional, Aziz, Alex, additional, Tang, Rui, additional, Pan, Zheng‐Ze, additional, Inoue, Kazutoshi, additional, Kotani, Motoko, additional, Tanaka, Hideki, additional, Scholtzová, Eva, additional, Tunega, Daniel, additional, Nishina, Yuta, additional, Nishioka, Kiho, additional, Nakanishi, Shuji, additional, Zhou, Yi, additional, Terasaki, Osamu, additional, and Nishihara, Hirotomo, additional

Published
2023
Full Text
View/download PDF

12. Chemistry of zipping reactions in mesoporous carbon consisting of minimally stacked graphene layers

Author

Xia, Tian, primary, Yoshii, Takeharu, additional, Nomura, Keita, additional, Wakabayashi, Keigo, additional, Pan, Zheng-Ze, additional, Ishii, Takafumi, additional, Tanaka, Hideki, additional, Mashio, Takashi, additional, Miyawaki, Jin, additional, Otomo, Toshiya, additional, Ikeda, Kazutaka, additional, Sato, Yohei, additional, Terauchi, Masami, additional, Kyotani, Takashi, additional, and Nishihara, Hirotomo, additional

Published
2023
Full Text
View/download PDF

15. Porphyrin/Fullerene Porous Molecular Cocrystal Featuring a Robust One-Dimensional Channel.

Author

Sato N, Toyoda R, Sato T, Lang Goo Z, Takaishi S, Chida K, Yoshii T, Nishihara H, Sugimoto K, and Sakamoto R

Abstract

Microporous molecular crystals are promising materials because of their designable porosity as well as their resistance to chemical and other stimuli. Here, we developed microporous molecular cocrystals by taking advantage of the specific interactions between porphyrins and fullerene molecules. Single-crystal X-ray diffraction analysis revealed that one nickel(II) porphyrin interacts with two fullerene molecules to form a two-dimensional honeycomb network with an eclipsed stacking mode, providing one-dimensional void channels. After the pores were activated by heat treatment or mechanical grinding, the prepared cocrystal can incorporate gas and solvent molecules reversibly while maintaining its single-crystallinity. Also, it retained its single-crystallinity in the presence of water, acid-base, or high pressure. These findings in this study expand the availability of molecular crystals based on intermolecular interactions as porous materials, which are expected to work under conditions that have not been applicable to other molecule-based porous materials., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Co-published by University of Science and Technology of China and American Chemical Society.)

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results