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.
Bibliographical noteFunding 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.
© 2019 The Royal Society of Chemistry.
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