Exploring low-cost, high-performance, and stable electrocatalysts toward the oxygen evolution reaction (OER) is highly desired but remains challenging. Transition metal hydroxide has been wildly utilized as a promising candidate, but practical implementation is impeded by insufficient catalytic activity, easy agglomeration, and poor conductivity. Here, we report that both phosphorization and combination with MXnene can improve the catalysts’ intrinsic activity and conductivity. Besides, MXene also prevents the agglomeration of the nanoparticles, resulting in the enhanced exposure of active sites. Experimental characterizing and density functional theory simulations revealed that P species can attract electrons to promote the formation of high-valence states of adjacent metal atoms, and coupling MXene support can effectively modulate the electronic structure and optimize the d-band center, which boosts the OER performance. Consequently, the optimized NiFeCoP/Mxene catalyst exhibits a low overpotential of 240 mV at a current density of 10 mA cm⁻², a small Tafel slope of 55 mV dec⁻¹, and superior long-term stability of 40 h in 1 M KOH electrolyte, which is superior to other counterparts.

探索用于析氧反应（OER）的低成本、高性能和稳定的电催化剂是非常需要的，但仍然具有挑战性。过渡金属氢氧化物已被广泛用作一种有前途的候选物，但由于催化活性不足、易团聚和导电性差等问题阻碍了其实际应用。在这里，我们报告磷化和与 MXnene 的结合都可以提高催化剂的内在活性和电导率。此外，MXene 还可以防止纳米颗粒的团聚，从而增加活性位点的暴露。实验表征和密度泛函理论模拟表明，P 物种可以吸引电子以促进相邻金属原子高价态的形成，d波段中心，可提高 OER 性能。因此，优化的 NiFeCoP/Mxene 催化剂在 10 mA cm ^-2的电流密度下表现出 240 mV 的低过电位、55 mV dec ^-1的小塔菲尔斜率，以及在 1 M KOH 中 40 小时的优异长期稳定性电解质，优于其他同类产品。