Anhydrous Fast Proton Transport Boosted by the Hydrogen Bond Network in a Dense Oxide‐Ion Array of α‐MoO3. Issue 34 (20th July 2022)

• Record Type: Journal Article
• Authors: Ma, Zihan; Shi, Xiang‐Mei; Nishimura, Shin‐ichi; Ko, Seongjae; Okubo, Masashi; Yamada, Atsuo
• Is Part Of: Advanced materials. Volume 34:Issue 34(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-20
• Subjects: aqueous batteries -- high‐rate batteries -- proton intercalation -- proton transfer; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202203335
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Developing high‐power battery chemistry is an urgent task to buffer fluctuating renewable energies and achieve a sustainable and flexible power supply. Owing to the small size of the proton and its ultrahigh mobility in water via the Grotthuss mechanism, aqueous proton batteries are an attractive candidate for high‐power energy storage devices. Grotthuss proton transfer is ultrafast owing to the hydrogen‐bonded networks of water molecules. In this work, similar continuous hydrogen bond networks in a dense oxide‐ion array of solid α‐MoO3 are discovered, which facilitate the anhydrous proton transport even without structural water. The fast proton transfer and accumulation that occurs during (de)intercalation in α‐MoO3 is unveiled using both experiments and first‐principles calculations. Coupled with a zinc anode and a superconcentrated Zn 2+ /H + electrolyte, the proton‐transport mechanism in anhydrous hydrogen‐bonded networks realizes an aqueous MoO3 –Zn battery with large capacity, long life, and fast charge–discharge abilities. Abstract : The kinetic property of inserted charge carriers in a battery electrode dominates the power density of the system. In this work, the fast proton‐transfer mechanism in the unique dense framework of α‐MoO3 is decoded. The hydrogen bond network boosts the proton transport and thus realizes a proton battery with high rate capabilities and long life.