Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts

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Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts
Title:
Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts
Journal Title:
ACS Nano
Keywords:
Publication Date:
10 November 2022
Citation:
Gao, J., Liu, Y., Liu, B., & Huang, K.-W. (2022). Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts. ACS Nano, 16(11), 17761–17777. https://doi.org/10.1021/acsnano.2c08519
Abstract:
Water oxidation reaction (also known as the oxygen evolution reaction, OER) plays a critical role in green hydrogen production via water splitting, electrochemical carbon dioxide reduction, and nitrogen fixation. The four-electron and four-proton transfer OER process involves multiple reaction intermediates and elementary steps that lead to sluggish kinetics; therefore, a high overpotential is needed to drive the reaction. Among the different water-splitting devices, the proton exchange membrane water electrolyzer offers greater advantages but its anode electrocatalysts are limited to iridium-based materials. Iridium catalyst has been extensively studied in recent years due to its balanced activity and stability for acidic OER, and many exciting signs of progress have been made. In this review, the surface and bulk Pourbaix diagrams of iridium species in aqueous solution are first introduced. The iridium-based catalysts including metallic or oxides, amorphous or crystalline, single crystals, atomically dispersed or nanostructured, and iridium compounds for OER are then elaborated. The latest progress of active sites, reaction intermediates, reaction kinetics, and elementary steps are summarized. Finally, the future research directions regarding acidic OER on iridium catalysts are discussed.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - Career Development Fund
Grant Reference no. : C210812029
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsnano.2c08519.
ISSN:
1936-0851
1936-086X
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