Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Jiajian Gao
  • Yan Liu
  • Bin Liu
  • Kuo-Wei Huang

Detail(s)

Original languageEnglish
Pages (from-to)17761-17777
Journal / PublicationACS Nano
Volume16
Issue number11
Online published10 Nov 2022
Publication statusPublished - 22 Nov 2022
Externally publishedYes

Abstract

The water oxidation reaction (or oxygen evolution reaction, OER) plays a critical role in green hydrogen production via water splitting, electrochemical CO2 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 necessary to drive the reaction. Among the different water-splitting electrolyzers, the proton exchange membrane type electrolyzer has greater advantages, but its anode catalysts are limited to iridium-based materials. The 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 an aqueous solution are 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 is summarized. Finally, future research directions regarding iridium catalysts for acidic OER are discussed. © 2022 American Chemical Society.

Research Area(s)

  • Active sites, Electrocatalysis, Iridium electrocatalyst, Nanostructure, Oxygen evolution reaction, Reaction intermediates, Reaction mechanism, Scaling relations, Water oxidation reaction

Citation Format(s)

Progress of Heterogeneous Iridium-Based Water Oxidation Catalysts. / Gao, Jiajian; Liu, Yan; Liu, Bin et al.
In: ACS Nano, Vol. 16, No. 11, 22.11.2022, p. 17761-17777.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review