Inter‐relationships between Oxygen Evolution and Iridium Dissolution Mechanisms

The widespread utilization of proton exchange membrane (PEM) electrolyzers currently remains uncertain, as they rely on the use of highly scarce iridium as the only viable catalyst for the oxygen evolution reaction (OER), which is known to present the major energy losses of the process. Understandin...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2022-03, Vol.61 (14), p.e202114437-n/a
Main Authors: Lončar, Anja, Escalera‐López, Daniel, Cherevko, Serhiy, Hodnik, Nejc
Format: Article
Language:English
Subjects:
Catalysts
Dissolution
electrocatalysis
Green hydrogen
Hydrogen production
Intermediates
Iridium
Minireview
Minireviews
Oxygen
oxygen evolution reaction
Oxygen evolution reactions
stability
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Summary:The widespread utilization of proton exchange membrane (PEM) electrolyzers currently remains uncertain, as they rely on the use of highly scarce iridium as the only viable catalyst for the oxygen evolution reaction (OER), which is known to present the major energy losses of the process. Understanding the mechanistic origin of the different activities and stabilities of Ir‐based catalysts is, therefore, crucial for a scale‐up of green hydrogen production. It is known that structure influences the dissolution, which is the main degradation mechanism and shares common intermediates with the OER. In this Minireview, the state‐of‐the‐art understanding of dissolution and its relationship with the structure of different iridium catalysts is gathered and correlated to different mechanisms of the OER. A perspective on future directions of investigation is also given. The storage of excess renewable energy in the form of hydrogen depends on the efficiency of the oxygen evolution reaction (OER) and thus the rational design of novel iridium‐based catalysts with improved electrocatalytic properties. To achieve this, it is necessary to understand both the OER and dissolution mechanisms as well as their inter‐relationship. This Minireview gathers state‐of‐the‐art information of these phenomena on different Ir catalysts.
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202114437