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  • Atomically dispersed hexavalent iridium oxide from MnO2 reduction for oxygen evolution catalysis

    • Atomically dispersed hexavalent iridium oxide from MnO2 reduction for oxygen evolution catalysis

    Title Atomically dispersed hexavalent iridium oxide from MnO2 reduction for oxygen evolution catalysis
    Authors Ailong Li, Shuang Kong, Kiyohiro Adachi, Hideshi Ooka, Kazuna Fushimi, Qike Jiang, Hironori Ofuchi, Satoru Hamamoto, Masaki Oura, Kotaro Higashi, Takuma Kaneko, Tomoya Uruga, Naomi Kawamura, Daisuke Hashizume and Ryuhei Nakamura
    Magazine Science
    Date 05/10/2024
    DOI 10.1126/science.adg5193
    Introduction Hexavalent iridium (Ir VI) oxide is theoretically considered the most active and stable iridium oxide for the oxygen evolution reaction in acidic environments. However, its practical development has faced considerable hurdles. This study details the preparation, characterisation, and application of an atomically dispersed Ir VI oxide (Ir VI-ado) designed for proton exchange membrane (PEM) water electrolysis. The synthesis involved the oxidative ligand substitution of potassium hexachloroiridate(IV) (K2IrCl6) using manganese oxide (MnO2). The resulting Ir VI-ado demonstrated exceptional performance, exhibiting a mass-specific activity of 1.7 × 10^5 amperes per gram of iridium and a turnover number of 1.5 × 10^8, surpassing the benchmarks set by other iridium oxides. In situ x-ray analysis performed during PEM operations confirmed the sustained durability of Ir VI at current densities up to 2.3 amperes per square centimetre. The greater activity and stability of Ir VI-ado highlight its significant potential as an anode material for PEM electrolysis systems.
    Quote Ailong Li, Shuang Kong and Kiyohiro Adachi et al. Atomically dispersed hexavalent iridium oxide from MnO 2 reduction for oxygen evolution catalysis . Science. 2024. Vol. 384(6696):666-670. DOI: 10.1126/science.adg5193
    Element Iridium (Ir) , Manganese (Mn) , Oxygen (O) , Potassium (K)
    Materials Chemical Compounds
    Industry Fuel Cells , Energy Storage & Batteries , Chemical Manufacturing , Research & Laboratory
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