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Engineering oxygen vacancies on dendrite-like IrO2 for the oxygen evolution reaction in acidic solution

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Abstract

Here we report IrO2 with dendrite-like nanostructures (DLNs) as a catalyst for the oxygen evolution reaction (OER) in acidic solution. The IrO2 DLNs are prepared by the molten salt method and have self-standing three dimensional structures. IrO2 with DLNs has a high mass activity determined to be 19-fold that of commercial IrO2. Combining a wide array of ex situ characterization methods, we demonstrate that the sublayer Ir cations and lattice O participate in the OER. The Ir corrosion and O/OH adsorption during the OER can lead to IrO2 surface reconstruction, from a compressed one to a stretched one.

Graphical abstract: Engineering oxygen vacancies on dendrite-like IrO2 for the oxygen evolution reaction in acidic solution

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Article information


Submitted
02 Jan 2020
Accepted
26 Feb 2020
First published
27 Feb 2020

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

Engineering oxygen vacancies on dendrite-like IrO2 for the oxygen evolution reaction in acidic solution

C. Cai, S. Han and Y. Tang, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/D0SE00007H

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