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Description:

Two dimensional (2D) crystals have attracted strong interest as a new class of proton conducting materials that can block atoms, molecules and ions while allowing proton transport through the atomically thin basal planes. Although 2D materials exhibit this perfect selectivity, the reported proton conductivities have been relatively low. Here we show that vacancy-rich titania monolayers are highly permeable to protons while remaining impermeable to helium with proton conductivity exceeding 100 S cm-2 at 200 oC and surpassing targets set by industry roadmaps. The fast and selective proton transport is attributed to an extremely high density of titanium-atom vacancies (one per square nm), which effectively turns titania monolayers into angstrom-scale sieves. Our findings highlight the potential of 2D oxides as membrane materials for hydrogen-based technologies.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Nanosheets, Proton transport, Ion conductivity

Date published: 2024-12-04

Publisher: Springer Nature

Journal:

• Nature Communications (ISSN: 20411723) vol. 15 p. 1-8 10546

Funding:

• Science and Technology Development Fund (FDCT), Macao SAR 0063/2023/RIA1
• Natural Science Foundation of China 52322319
• UM research grant SRG2022-00053- IAPME
• UM and UMDF research grant MYRG-GRG2023-00014-IAPMEUMDF
• European Research Council VANDER
• Lloyd’s Register Foundation Designer Nanomaterials
• Royal Society URF\R1\201515
• andDirected Research Projects Program of the Research and Innovation Center for Graphene and 2D Materials at Khalifa University RIC2D-D001

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41467-024-54544-z

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Updated at: 2024-12-06 17:17:41 +0900

Published on MDR: 2024-12-06 17:17:41 +0900