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Ultrasmall α-MnO2 (<10 nm) with a low aspect ratio (c/a ~ 2) is synthesized using a newly developed alcohol solution process. This material demonstrated exceptional performance across various multivalent battery systems, primarily due to the significantly reduced cation diffusion distance. Notably, an ultrasmall α-MnO2-graphene composite achieved high capacity with low overpotential when paired with an F-free electrolyte in Ca battery. Regarding aerobic oxidation catalysis, the nanosizing of α-MnO2 had a profound impact on aerobic oxidation catalysis. The increased efficiency of oxidative conversion reactions, such as the oxidation of 1-phenylethanol, was attributed to the greatly expanded active surface area of the catalyst. The versatile
functionality of ultrasmall α-MnO2 underscores its potential to revolutionize energy storage and catalysis, offering broad applicability in next-generation green energy technologies.

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• In Copyright
  

  This is the peer reviewed version of the following article: R. Iimura, S. Kawasaki, T. Yabu, S. Tachibana, K. Yamaguchi, T. Mandai, K. Kisu, N. Kitamura, Z. Zhao-Karger, S. Orimo, Y. Idemoto, M. Matsui, M. Fichtner, I. Honma, T. Ichitsubo, H. Kobayashi, Ultrasmall α-MnO2 with Low Aspect Ratio: Applications to Electrochemical Multivalent-Ion Intercalation Hosts and Aerobic Oxidation Catalysts. Small 2025, 21, 2411493, which has been published in final form at https://doi.org/10.1002/smll.202411493. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

Keyword: Nanoparticle, Oxide, Magnesium battery

Date published: 2025-01-16

Publisher: Wiley

Journal:

• Small (ISSN: 16136810) vol. 21 issue. 7

Funding:

• Japan Science and Technology Agency JPMJGX23S1 (GteX)
• Japan Science and Technology Agency JPMJAL1301 (ALCA-SPRING)
• Japan Society for the Promotion of Science 23K13816
• Light Metal Educational Foundation
• Tohoku University
• Deutsche Forschungsgemeinschaft 390874152

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5434

First published URL: https://doi.org/10.1002/smll.202411493

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Updated at: 2026-01-16 12:30:16 +0900

Published on MDR: 2026-01-16 08:32:33 +0900