The rational design of electrocatalysts with active and long-durable characters applying in acidic proton exchange membrane electrolyzers is a spotlight for the sustainable energy storage. With the aim of tuning electronic structure of electrocatalysts and altering potential limiting step of the oxygen evolution reaction (OER), the ultra-small Pt, La co-doped IrO₂ nanoparticles with average size of 2 nm highly dispersed on N-doped carbon (NC) was designed. Impressively, the representative Pt_0.1La_0.1-IrO₂@NC exhibited the record performance toward OER in 0.5 M H₂SO₄ with a low overpotential of 205 mV (10 mA·cm⁻²), an extremely excellent stability of 135 h, and a fairly high TOF value of 5.71 s⁻¹ at η =280 mV. Theoretical calculations revealed that the co-doping of Pt, La into the lattice of IrO₂ could rationally tune d band centers and lower the energy barrier for the potential-determining step (from *O to *OOH) toward OER.

酸性质子交换膜电解槽中具有活性和持久特性的电催化剂的合理设计是可持续储能的重点。为了调整电催化剂的电子结构并改变氧释放反应（OER）的电势限制步骤，平均粒径为2 nm的超小Pt，La共掺杂的IrO ₂纳米粒子高度分散在N掺杂的碳上（ NC）的设计。令人印象深刻的是，代表性的Pt _0.1 La _0.1 -IrO ₂ @NC在0.5 MH ₂ SO _4中具有205 mV（10 mA·cm ^-2的低电势）的OER记录性能。），135 h的极佳稳定性以及在η= 280 mV时的5.71 s ^-1的相当高的TOF值。理论计算表明，Pt，La共掺杂到IrO ₂晶格中可以合理地调整d能带中心并降低势能确定步骤（从* O到* OOH）向OER的能垒。