Iridium, ruthenium, and cobalt oxides are target materials as efficient and stable mesoporous metal oxide electrocatalysts for oxygen evolution reaction (OER). However, they are costly, toxic, and not practical for an efficient OER process. Here, a two‐step method is introduced, based on earth‐abundant manganese; molten salt‐assisted self‐assembly process to prepare mesoporous LiMn_2−x Co_x O₄ (x = 0–0.5) modified electrodes, in which a systematic incorporation of Co(II) into the structure is performed using successive ionic layer adsorption and reaction followed by an annealing (SILAR‐AN) process. Applying SILAR‐AN over a stable m‐LiMn_1.6Co_0.4O₄ electrode improves the OER performance; the Tafel slope and overpotential drop from 66 to 46 mV dec⁻¹ and 304 to 265 mV (at 1.0 mA cm⁻²), respectively. The performance of the modified electrodes is comparable to benchmark IrO₂ and RuO₂ catalysts and much better than cobalt oxide electrodes. Electronic interactions between the neighboring Mn and Co sites synergistically amplify the OER performance of the m‐LiMn_2−x Co_x O₄ electrodes. The data are compatible with an eight steps nucleophilic acid‐base reaction mechanism during OER.

中文翻译：

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通过SILAR方法改性介孔LiMn2O4和LiMn2-xCoxO4进行高效水氧化电催化

铱，钌和钴氧化物是目标材料，它们是用于氧释放反应（OER）的高效，稳定的中孔金属氧化物电催化剂。然而，它们昂贵，有毒，并且对于有效的OER工艺而言不实用。在此，我们介绍了一种基于富含稀土元素的锰的两步法。熔融盐辅助自组装过程，以制备介孔LiMn _{2- x} Co _x O ₄（x = 0-0.5）修饰电极，其中使用连续离子层吸附和离子交换法将Co（II）系统地结合到结构中反应，然后进行退火（SILAR-AN）过程。在稳定的m-LiMn _1.6 Co _0.4 O _4上使用SILAR‐AN电极提高了OER性能；Tafel斜率和过电势分别从66 mV dec ^-1和304 mF下降到265 mV（1.0 mA cm ^-2）。改性电极的性能与基准IrO ₂和RuO ₂催化剂相当，并且比氧化钴电极好得多。相邻的Mn和Co位点之间的电子相互作用可协同放大m-LiMn ₂ - _x Co _x O ₄电极的OER性能。数据与OER期间的八步亲核碱反应机制兼容。