Revisiting the Activity Gap of Iridium Electrocatalysts for Acidic Water Oxidation.

Jiajian Gao, Sze Xing Tan, Yan Liu, Bin Liu, Kuo-Wei Huang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Iridium electrocatalysts have been extensively studied for the acidic water oxidation reaction (2H2O → O2 + 4H+ + 4e–, also known as the oxygen evolution reaction, OER) in recent years. However, the activity of different iridium catalysts, such as amorphous, crystalline, and metallic ones, varies significantly, and there is no common explanation for the origin of this difference. Here four types of iridium catalysts were selected as models and characterized by various techniques. The redox behavior of iridium catalysts and oxidation of hydrogen peroxide (in the form of OOH–) were applied to in situ probe the adsorption energy of oxygen reaction intermediates (*OH, *O, and *OOH) on iridium catalysts under the OER conditions. Structure–activity analysis suggested that the more optimal and broader distribution of adsorption energies on metallic iridium (iridium black) and its good conductivity are the origin of its highest activity among the four different iridium catalysts.
Original languageEnglish (US)
Pages (from-to)6494-6505
Number of pages12
JournalThe Journal of Physical Chemistry Letters
StatePublished - Jul 13 2023

ASJC Scopus subject areas

  • General Materials Science


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