Yoko Kokubo
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Yoko Kokubo has a total of 10 co-authors. Here are the top co-authors by number of shared publications:
- Artem M. Abakumov
Skolkovo Institute of Science and Technology
1 shared publication - Fumitaka Takeiri
Graduate School of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka, 577-8502, Japan
1 shared publication - Hiroshi Kageyama
Kyoto University
1 shared publication - Iaroslava Shakhova
Advanced Imaging Core Facility, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
1 shared publication - Kenji Arai
Department of Applied Chemistry, Faculty of Chemistry and Biochemistry, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ku, Yokohama, 221-8686, Japan
1 shared publication - Maria A. Kirsanova
Skolkovo Institute of Science and Technology
1 shared publication
Latest Publications
- Open Access
- 28 May 2025
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry A
- Vol. 13 (27) , 21472-21479
Thermally stable proton-conducting oxy-hydroxides synthesized in concentrated water vapor
The diverse functionalities of (oxy-)hydroxides, such as electrocatalytic activity of transition-metal oxy-hydroxides in the oxygen evolution reaction (OER) and ion exchange capabilities of layered double hydroxides (LDHs), continue to attract significant interest. However, these compounds are typically synthesized in aqueous solutions at room temperature, under hydrothermal conditions, or in mild vapor atmospheres. Here, we present a novel (oxy-)hydroxide synthesis technique called “vapor hydroxidation,” which is conducted in a highly concentrated water vapor atmosphere at elevated temperatures. Structural analysis revealed the formation of a new oxy-hydroxide, [Ba2Ox(OH)y]0.55InO2, with a misfit-layered structure, characterized by alternating incommensurate barium hydroxide bilayers and indium oxide blocks. Unlike known (oxy-)hydroxides, this oxy-hydroxide displays exceptional thermal stability, retaining hydroxide ions within its crystal structure up to approximately 700 °C. These features suggest promising potential for high-temperature proton conductivity, as demonstrated by an electrical conductivity of 5 × 10−4 S cm−1 at 500 °C even under dry argon. Our “vapor hydroxidation” method thus opens up a new avenue for the development of proton-functional materials with unconventional chemical and electronic characteristics.
- 28 May 2025
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry A
- Vol. 13 (27) , 21472-21479
Open AccessThermally stable proton-conducting oxy-hydroxides synthesized in concentrated water vapor
The diverse functionalities of (oxy-)hydroxides, such as electrocatalytic activity of transition-metal oxy-hydroxides in the oxygen evolution reaction (OER) and ion exchange capabilities of layered double hydroxides (LDHs), continue to attract significant interest. However, these compounds are typically synthesized in aqueous solutions at room temperature, under hydrothermal conditions, or in mild vapor atmospheres. Here, we present a novel (oxy-)hydroxide synthesis technique called “vapor hydroxidation,” which is conducted in a highly concentrated water vapor atmosphere at elevated temperatures. Structural analysis revealed the formation of a new oxy-hydroxide, [Ba2Ox(OH)y]0.55InO2, with a misfit-layered structure, characterized by alternating incommensurate barium hydroxide bilayers and indium oxide blocks. Unlike known (oxy-)hydroxides, this oxy-hydroxide displays exceptional thermal stability, retaining hydroxide ions within its crystal structure up to approximately 700 °C. These features suggest promising potential for high-temperature proton conductivity, as demonstrated by an electrical conductivity of 5 × 10−4 S cm−1 at 500 °C even under dry argon. Our “vapor hydroxidation” method thus opens up a new avenue for the development of proton-functional materials with unconventional chemical and electronic characteristics.