2026-03-09T23:49:58Z https://ynu.repo.nii.ac.jp/oai

oai:ynu.repo.nii.ac.jp:02001448 2025-04-30T06:09:00Z 495:496

Highly porous boron nitride as a metal-free heterogeneous catalyst for cycloaddition of CO2 to epoxides Miyamoto, Teppei Department of Applied Chemistry, Faculty of Engineering, Kyushu University 0000-0002-7829-3451 30456157 Takagaki, Atsushi Division of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University 0000-0003-1047-6152 Song, Jun, Tae Department of Applied Chemistry, Faculty of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University 0000-0003-3621-4361 Watanabe, Motonori Department of Applied Chemistry, Faculty of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University 80184555 Ishihara, Tatsumi Department of Applied Chemistry, Faculty of Engineering, Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University embargoed access Self-repairing catalysts are useful for achieving alkaline water electrolyzers with long lifetimes under intermittent operation. However, rational methodologies for designing self-repairing catalysts have not yet been established. Herein, hybrid cobalt hydroxide nanosheets (Co-ns), with a high deposition (repairing) rate, and β-FeOOH nanorods (Fe-nr), with high oxygen evolution reaction (OER) ability, are electrostatically self-assembled into composite catalysts. This strategy is developed to integrate multifunctionality in self-repairing catalysts. Positively charged Co-ns and negatively charged Fe-nr form uniform composites when dispersed in an electrolyte. These composites are electrochemically deposited on a nickel electrode by electrolysis at 800 mA cm−2. Co-ns form a conductive mesoporous assembly of CoOOH nanosheets as a support. Fe-nr are then distributed on the CoOOH nanosheets as active sites for the OER. Because of the high deposition rate of Co-ns, the amount of Fe-nr deposited increases 22 times compared to when Fe-nr is deposited alone, and the OER current density increases 14 times compared to that of Co-ns alone. The composite self-repair catalyst shows the highest activity and durability under an accelerated durability test (ADT), and its degradation rate decreases from 84 μV cycle−1 (Fe-nr only) to 60 μV cycle−1 (composite catalyst) under ADT conditions without repair. Royal Society of Chemistry 2024-12-07 eng journal article AM http://hdl.handle.net/10131/0002001448 https://ynu.repo.nii.ac.jp/records/2001448 https://doi.org/10.1039/D4CY01080A JP21K18853 20444753 Catalysis Science & Technology 14 23 8 6782 6789 https://ynu.repo.nii.ac.jp/record/2001448/files/revised_manuscript.pdf application/pdf 731.0 KB 2025-10-04 2024-10-03 https://ynu.repo.nii.ac.jp/record/2001448/files/d4cy01080a1.pdf application/pdf 201.0 KB 2024-10-03 2024-10-03