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Electrocatalysis Of Oxygen Evolution Reaction On Sriro3 Grown Using Molecular Beam Epitaxy

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Abstract

Electrochemical generation of oxygen via the oxygen evolution reaction (OER) is a key enabling step for many air-breathing electrochemical energy storage devices. Among the known OER catalysts, IrO2 (Ir4+: 5d5) is among the most active. In this thesis we present our measurement of the OER kinetics on single-crystal, epitaxial SrIrO3(100) synthesized using molecular-beam epitaxy on DyScO3(110). We find that by switching the host structure of the Ir4+ octahedra from edge-sharing rutile (IrO2) to corner-sharing perovskite (SrIrO3), the OER activity can increase by more than an order of magnitude. The dependence of the OER activity on the structure of Ir4+ suggests on the importance of the neighboring structure beyond a simple Ir4+-O6 unit in OER electrocatalysis. This finding highlights the need to incorporate the near-neighbor interaction consideration to the design of the future transition metal oxide electrocatalysts.

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2015-08-17

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5d perovskite oxides; iridates; oxygen evolution reaction

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Suntivich,Jin

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Abruna,Hector D

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Materials Science and Engineering

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M.S., Materials Science and Engineering

Degree Level

Master of Science

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Government Document

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dissertation or thesis

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