# Atomically dispersed hexavalent iridium oxide from MnO 2 reduction for oxygen evolution catalysis

“Atomically dispersed hexavalent iridium oxide from MnO 2 reduction for oxygen evolution catalysis” (2024), by Ailong Li et al. Energy research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Ailong Li, Shuang Kong, Kiyohiro Adachi, Hideshi Ooka, Kazuna Fushimi, Qike Jiang, Hironori Ofuchi, Satoru Hamamoto, Masaki Oura, Kotaro Higashi et al.
- Published: May 9, 2024
- Field: Energy
- DOI: https://doi.org/10.1126/science.adg5193
- Source: https://doi.org/10.1126/science.adg5193

## Abstract

Hexavalent iridium (Ir VI ) oxide is predicted to be more active and stable than any other iridium oxide for the oxygen evolution reaction in acid; however, its experimental realization remains challenging. In this work, we report the synthesis, characterization, and application of atomically dispersed Ir VI oxide (Ir VI - ado ) for proton exchange membrane (PEM) water electrolysis. The Ir VI - ado was synthesized by oxidatively substituting the ligands of potassium hexachloroiridate(IV) (K 2 IrCl 6 ) with manganese oxide (MnO 2 ). The mass-specific activity (1.7 × 10 5 amperes per gram of iridium) and turnover number (1.5 × 10 8 ) exceeded those of benchmark iridium oxides, and in situ x-ray analysis during PEM operations manifested the durability of Ir VI at current densities up to 2.3 amperes per square centimeter. The high activity and stability of Ir VI - ado showcase its promise as an anode material for PEM electrolysis.

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