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.

中文翻译：

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用于析氧催化的 MnO 2 还原原子分散的六价氧化铱

六价铱（Ir六、) 对于酸中的析氧反应，预计氧化物比任何其他氧化铱都更加活跃和稳定；然而，其实验实现仍然具有挑战性。在这项工作中，我们报告了原子分散 Ir 的合成、表征和应用六、氧化物（铱六、-闲事）用于质子交换膜（PEM）水电解。他们的六、-闲事通过氧化取代六氯铱酸钾(IV) (K2氯化亚铁6）与氧化锰（MnO2）。质量比活度 (1.7 × 105安培每克铱）和周转数（1.5 × 108）超过了基准氧化铱，并且 PEM 操作期间的原位 X 射线分析表明了铱的耐用性六、电流密度高达每平方厘米 2.3 安培。 Ir的高活性和稳定性六、-闲事展示其作为 PEM 电解阳极材料的前景。