Efficient oxygen evolution on mesoporous IrOx nanosheets. Issue 14 (19th June 2019)

• Record Type: Journal Article
• Authors: Jiang, Bo; Kim, Jeonghun; Guo, Yanna; Wu, Kevin C. W.; Alshehri, Saad M.; Ahamad, Tansir; Alhokbany, Norah; Henzie, Joel; Yamachi, Yusuke
• Is Part Of: Catalysis science & technology. Volume 9:Issue 14(2019)
• Page Start: 3697
• Page End: 3702
• Publication Date: 2019-06-19
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c9cy00302a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Amorphous iridium oxide (IrO x ) is a promising catalyst that has high activity in the oxygen evolution reaction (OER) over a broad range of pH values. 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.