Issue 11, 2021

Recent advances in understanding oxygen evolution reaction mechanisms over iridium oxide

Abstract

Water electrolysis driven by renewable energy can produce clean hydrogen, but its efficiency remains low, in part because of slow kinetics at the anode for the oxygen evolution reaction (OER). Learning from the most active catalysts for the OER, iridium oxides, would be the key to the development and establishment of design guidelines for active and stable OER catalysts. This article reviews in situ or operando spectroscopic and advanced computational studies in the past decade concerning the OER over iridium oxide for both the oxidation of water molecules and hydroxide ions. By collectively reviewing the reported findings, we illustrate the plausible OER catalytic cycles including the dissolution of iridium during the reaction, which at the same time disclosed discrepancies in the proposed mechanisms. Such discrepancies are thought to originate from variations in the experimental conditions employed in those studies, calling for comprehensive and systematic in situ or operando studies in the future. Toward the end, we discuss a recent approach for improving the activity and stability of OER catalysts.

Graphical abstract: Recent advances in understanding oxygen evolution reaction mechanisms over iridium oxide

Article information

Article type
Review Article
Submitted
14 dec 2020
Accepted
17 jan 2021
First published
18 jan 2021
This article is Open Access
Creative Commons BY-NC license

Inorg. Chem. Front., 2021,8, 2900-2917

Recent advances in understanding oxygen evolution reaction mechanisms over iridium oxide

T. Naito, T. Shinagawa, T. Nishimoto and K. Takanabe, Inorg. Chem. Front., 2021, 8, 2900 DOI: 10.1039/D0QI01465F

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