Efficient oxygen evolution on mesoporous IrO:X nanosheets
Journal
Catalysis Science and Technology
Journal Volume
9
Journal Issue
14
Pages
3697-3702
Date Issued
2019
Author(s)
Jiang, B.
Kim, J.
Guo, Y.
Wu, K.C.W.
Alshehri, S.M.
Ahamad, T.
Alhokbany, N.
Henzie, J.
Yamachi, Y.
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.
Type
journal article