4.8 Article

Mesoporous Metallic Iridium Nanosheets

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 39, Pages 12434-12441

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b05206

Keywords

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Funding

  1. Australian Research Council (ARC) [FT150100479]
  2. JSPS KAKENHI [17H05393, 17K19044]
  3. Suzuken Memorial Foundation
  4. Grants-in-Aid for Scientific Research [17K19044] Funding Source: KAKEN

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Two-dimensional (2D) metals are an emerging class of nanostructures that have attracted enormous research interest due to their unusual electronic and thermal transport properties. Adding mesopores in the plane of ultrathin 2D metals is the next big step in manipulating these structures because increasing their surface area improves the utilization of the material and the availability of active sites. Here, we report a novel synthetic strategy to prepare an unprecedented type of 2D mesoporous metallic iridium (Ir) nanosheet. Mesoporous Ir nanosheets can be synthesized with close-packed assemblies of diblock copolymer (poly-(ethylene oxide)-b-polystyrene, PEO-b-PS) micelles aligned in the 2D plane of the nanosheets. This novel synthetic route opens a new dimension of control in the synthesis of 2D metals, enabling new kinds of mesoporous architectures with abundant catalytically active sites. Because of their unique structural features, the mesoporous metallic Ir nanosheets exhibit a high electrocatalytic activity toward the oxygen evolution reaction (OER) in acidic solution as compared to commercially available catalysts.

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