铱
催化作用
氧气
氧化物
氧还原
还原(数学)
化学
材料科学
无机化学
物理化学
冶金
电化学
生物化学
几何学
数学
有机化学
电极
作者
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,Ryuhei Nakamura
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2024-05-09
卷期号:384 (6696): 666-670
被引量:16
标识
DOI:10.1126/science.adg5193
摘要
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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