Mn_ySb_1–yO_x powders with a series of compositions were evaluated as catalysts for chemical water oxidation in aqueous perchloric, sulfuric, or methanesulfonic acid. O₂(g) evolved spontaneously over Mn_ySb_1–yO_x catalyst powders that had been suspended in solutions that were pre-loaded with Ce⁴⁺ ions. The rate of O₂ evolution depended on the amount, as well as the oxidation state, of the Mn in the powder. The highest O₂ evolution rate was observed from the most Mn-rich catalyst, which had an effective surface oxidation state of Mn^2.9+ in its rest state. The facile synthetic accessibility of such catalysts in powder form constitutes a step toward replacing Ir or Ru in Ce-mediated oxygen evolution in decoupled water splitting systems, as well as toward developing inks of earth-abundant catalysts for preparation of catalyst-coated membranes used in conventional proton-exchange membrane electrolyzers.

中文翻译：

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用于酸性环境中铈介导的氧气释放的粉状 MnySb1–yOx 催化剂

具有一系列成分的Mn _y Sb _{1– y} O _{x粉末被评估为在高氯酸、硫酸或甲磺酸水溶液中进行化学水氧化的催化剂。}O ₂ ( g )在悬浮在预载有 Ce ⁴⁺离子的溶液中的Mn _y Sb _{1– y} O _x催化剂粉末上自发产生。_{O 2}释放的速率取决于粉末中Mn的量以及氧化态。从最富锰的催化剂观察到最高的 O _{2释放速率，其具有有效的 Mn 表面氧化态}^2.9+处于静止状态。这种粉末形式的催化剂易于合成，是朝着在去耦水分解系统中取代 Ce 介导的氧气析出中的 Ir 或 Ru 迈出的一步，以及朝着开发地球上丰富的催化剂油墨以制备用于传统的质子交换膜电解槽。