Efficient oxygen evolution on mesoporous IrO:X nanosheets

Bo Jiang; Jeonghun Kim; Yanna Guo; Kevin C.W. Wu; Saad M. Alshehri; Tansir Ahamad; Norah Alhokbany; Joel Henzie; Yusuke Yamachi

doi:10.1039/c9cy00302a

Efficient oxygen evolution on mesoporous IrO_:X nanosheets

Bo Jiang, Jeonghun Kim, Yanna Guo, Kevin C.W. Wu, Saad M. Alshehri, Tansir Ahamad, Norah Alhokbany, Joel Henzie^*, Yusuke Yamachi

^*Corresponding author for this work

Kagami Memorial Research Institute for Materials Science and Technology

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

Abstract

Amorphous iridium oxide (IrO_x) is a 5d rare metal-based catalyst that has high activity towards the oxygen evolution reaction (OER) over a broad range of pH values. The scarcity of the elemental Ir makes large-scale applications more challenging, so increasing the material utilization efficiency is critical. We developed a sophisticated soft-templating method to synthesize mesoporous nanosheets via solution-based assembly of close-packed polymeric micelles in the presence of metal precursors and reducing agents. Heating the mesoporous nanosheets caused them to form amorphous IrO_x perforated with a semi-regular arrangement of ∼13 nm diameter holes. Mesoporous nanosheets have a unique mixture of 2D and 3D topologies that enable superior electrocatalytic activities for the OER, and good stabilities under both acidic and basic conditions.

Original language	English
Pages (from-to)	3697-3702
Number of pages	6
Journal	Catalysis Science and Technology
Volume	9
Issue number	14
DOIs	https://doi.org/10.1039/c9cy00302a
Publication status	Published - 2019

ASJC Scopus subject areas

Catalysis

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title = "Efficient oxygen evolution on mesoporous IrO:X nanosheets",

abstract = "Amorphous iridium oxide (IrOx) is a 5d rare metal-based catalyst that has high activity towards the oxygen evolution reaction (OER) over a broad range of pH values. The scarcity of the elemental Ir makes large-scale applications more challenging, so increasing the material utilization efficiency is critical. We developed a sophisticated soft-templating method to synthesize mesoporous nanosheets via solution-based assembly of close-packed polymeric micelles in the presence of metal precursors and reducing agents. Heating the mesoporous nanosheets caused them to form amorphous IrOx perforated with a semi-regular arrangement of ∼13 nm diameter holes. Mesoporous nanosheets have a unique mixture of 2D and 3D topologies that enable superior electrocatalytic activities for the OER, and good stabilities under both acidic and basic conditions.",

author = "Bo Jiang and Jeonghun Kim and Yanna Guo and Wu, {Kevin C.W.} and Alshehri, {Saad M.} and Tansir Ahamad and Norah Alhokbany and Joel Henzie and Yusuke Yamachi",

note = "Funding Information: This work was supported by the Australian Research Council (ARC) Future Fellow (grant FT150100479), JSPS KAKENHI (grants 19H02803 and 19F19074), and the research fund from the Suzuken Memorial Foundation. The authors extend their appreciation to the International Scientific Partnership Program (ISPP-024) at King Saud University (KSU) for funding this research work. This work was performed in part at the Queensland node of the Australian National Fabrication Facility, a company established under the National Collaborative Research Infrastructure Strategy to provide nano-and micro-fabrication facilities for Australia's researchers. Publisher Copyright: {\textcopyright} 2019 The Royal Society of Chemistry.",

year = "2019",

doi = "10.1039/c9cy00302a",

language = "English",

volume = "9",

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journal = "Catalysis Science and Technology",

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AU - Jiang, Bo

AU - Kim, Jeonghun

AU - Guo, Yanna

AU - Wu, Kevin C.W.

AU - Alshehri, Saad M.

AU - Ahamad, Tansir

AU - Alhokbany, Norah

AU - Henzie, Joel

AU - Yamachi, Yusuke

N1 - Funding Information: This work was supported by the Australian Research Council (ARC) Future Fellow (grant FT150100479), JSPS KAKENHI (grants 19H02803 and 19F19074), and the research fund from the Suzuken Memorial Foundation. The authors extend their appreciation to the International Scientific Partnership Program (ISPP-024) at King Saud University (KSU) for funding this research work. This work was performed in part at the Queensland node of the Australian National Fabrication Facility, a company established under the National Collaborative Research Infrastructure Strategy to provide nano-and micro-fabrication facilities for Australia's researchers. Publisher Copyright: © 2019 The Royal Society of Chemistry.

PY - 2019

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N2 - Amorphous iridium oxide (IrOx) is a 5d rare metal-based catalyst that has high activity towards the oxygen evolution reaction (OER) over a broad range of pH values. The scarcity of the elemental Ir makes large-scale applications more challenging, so increasing the material utilization efficiency is critical. We developed a sophisticated soft-templating method to synthesize mesoporous nanosheets via solution-based assembly of close-packed polymeric micelles in the presence of metal precursors and reducing agents. Heating the mesoporous nanosheets caused them to form amorphous IrOx perforated with a semi-regular arrangement of ∼13 nm diameter holes. Mesoporous nanosheets have a unique mixture of 2D and 3D topologies that enable superior electrocatalytic activities for the OER, and good stabilities under both acidic and basic conditions.

AB - Amorphous iridium oxide (IrOx) is a 5d rare metal-based catalyst that has high activity towards the oxygen evolution reaction (OER) over a broad range of pH values. The scarcity of the elemental Ir makes large-scale applications more challenging, so increasing the material utilization efficiency is critical. We developed a sophisticated soft-templating method to synthesize mesoporous nanosheets via solution-based assembly of close-packed polymeric micelles in the presence of metal precursors and reducing agents. Heating the mesoporous nanosheets caused them to form amorphous IrOx perforated with a semi-regular arrangement of ∼13 nm diameter holes. Mesoporous nanosheets have a unique mixture of 2D and 3D topologies that enable superior electrocatalytic activities for the OER, and good stabilities under both acidic and basic conditions.

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Efficient oxygen evolution on mesoporous IrO_:X nanosheets

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