The oxygen evolution reaction (OER), as the rate-determining step of electrochemical water splitting, is extremely crucial, and thus it is a requisite to engineer feasible and effective electrocatalysts to shrink the reaction energy barrier and accelerate the reaction. Herein, monodisperse Mn₃O₄ nanoparticles on a PANI substrate were synthesized by polymerization and in situ oxidation. Combining Mn₃O₄ nanoparticles and PANI fibers can not only maximize the strong coupling effect and synergistic effect but also construct a well-defined three-dimensional structure with extensive exposed active sites, where the permeation and adherence of the electrolyte are made exceedingly feasible, thus displaying excellent OER activity. Benefiting from the outstanding structural stability, the resulting Mn₃O₄/PANI/NF is able to deliver a low overpotential of 262 mV at a current density of 10 mA cm⁻², which outperforms the commercial RuO₂ catalyst (275 mV) as well as presently reported representative Mn-based and PANI-based electrocatalysts and state-of-the-art OER electrocatalysts. The synthetic method for Mn₃O₄/PANI not only provides a brand-new avenue for the rational design of inorganic material/conductive polymer composites but also broadens the understanding of the mechanism of Mn-based catalysts for highly enhanced OER.

中文翻译：

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强配位聚苯胺上原位生成锰尖晶石的高效OER催化剂

析氧反应（OER）作为电化学水分解的速率决定步骤，至关重要，因此需要设计可行且有效的电催化剂来缩小反应能垒并加速反应。在此，通过聚合和原位氧化合成了聚苯胺基底上的单分散Mn ₃ O _{4纳米颗粒。}结合 Mn ₃ O ₄纳米粒子和聚苯胺纤维不仅可以最大限度地发挥强耦合效应和协同效应，还可以构建具有广泛暴露活性位点的明确三维结构，使电解质的渗透和粘附变得非常可行，从而显示出优异的OER活性. 得益于出色的结构稳定性，所得的 Mn ₃ O ₄ /PANI/NF 能够在 10 mA cm ^-2的电流密度下提供 262 mV 的低过电势，其性能优于商用 RuO ₂催化剂（275 mV）：以及目前报道的具有代表性的 Mn 基和 PANI 基电催化剂和最先进的 OER 电催化剂。_{Mn 3} O的合成方法₄ /PANI不仅为无机材料/导电聚合物复合材料的合理设计提供了一条全新的途径，而且拓宽了对高增强OER的Mn基催化剂机理的理解。