Water-resistant redox-active metal–organic framework

Ryota Akai, Showa Kitajima, Kohei Okubo, Nobuyuki Serizawa, Hirotomo Nishihara, Hitoshi Kasai and Kouki Oka ()
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Ryota Akai: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials
Showa Kitajima: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials
Kohei Okubo: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials
Nobuyuki Serizawa: Keio University, Department of Applied Chemistry, Faculty of Science and Technology
Hirotomo Nishihara: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials
Hitoshi Kasai: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials
Kouki Oka: Tohoku University, Institute of Multidisciplinary Research for Advanced Materials

Nature Communications, 2025, vol. 16, issue 1, 1-10

Abstract: Abstract Metal–organic frameworks (MOFs) comprise coordination bonds and have attracted attention for electrochemical applications. However, MOFs are usually structurally weak in aqueous solutions, especially in acidic aqueous solutions, owing to their coordination bonds, making their application in charge-storage devices challenging. In the current work, we demonstrate a redox-active MOF (RAMOF) that is structurally stable and achieves reversible charge storage with almost the theoretical capacity even in acidic aqueous electrolytes owing to its strong Zr–O bonds and the large coordination number. In addition, the RAMOF exhibits high durability ( > 98% after 100 cycles) and high Coulombic efficiency (99.9%) owing to its high crystallinity and proton conductivity. An aqueous MOF–air rechargeable battery is fabricated and exhibits high durability and high Coulombic efficiency. Furthermore, the material recycling of the RAMOF based on its coordination bonds is demonstrated. Therefore, we conceptually prove the application and advantages of RAMOFs in aqueous environments.

Date: 2025
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DOI: 10.1038/s41467-025-65849-y

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