Issue 14, 2019

Efficient oxygen evolution on mesoporous IrOx 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.

Graphical abstract: Efficient oxygen evolution on mesoporous IrOx nanosheets

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
13 Feb 2019
Accepted
31 May 2019
First published
19 Jun 2019

Catal. Sci. Technol., 2019,9, 3697-3702

Efficient oxygen evolution on mesoporous IrOx nanosheets

B. Jiang, J. Kim, Y. Guo, K. C. W. Wu, S. M. Alshehri, T. Ahamad, N. Alhokbany, J. Henzie and Y. Yamachi, Catal. Sci. Technol., 2019, 9, 3697 DOI: 10.1039/C9CY00302A

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