Developing efficient platinum (Pt)-based electrocatalysts is enormously significant for fuel cells. Herein, we report an integrated electrocatalyst of ultralow-Pt alloy encapsulated into nitrogen-doped nanocarbon architecture for efficient oxygen reduction reaction. This hybrid Pt-based catalyst achieves a mass activity of 3.46 A mg_pt⁻¹ at the potential of 0.9 V vs. RHE with a negligible stability decay after 10,000 cycles. More importantly, this half-cell activity can be expressed at full cell level with a high Pt utilization of 10.22 W mg_Pt⁻¹_cathode and remarkable durability after 30,000 cycles in single-cell. Experimental and theoretical investigations reveal that a highly strained Pt structure with an optimal Pt-O binding energy is induced by the incorporation of Co/Ni into Pt lattice, which would account for the improved reaction kinetics. The synergistic catalysis due to nitrogen-doped nanocarbon architecture and active Pt component is responsible for the enhanced catalytic activity. Meanwhile, the strong metal-support interaction and optimized hydrophilic properties of nanocarbon matrix facilitate efficient mass transport and water management. This work may provide significant insights in designing the low-Pt integrated electrocatalysts for fuel cells and beyond.

开发高效的铂 (Pt) 基电催化剂对于燃料电池具有极其重要的意义。在此，我们报告了一种将超低铂合金封装到氮掺杂纳米碳结构中以实现高效氧还原反应的集成电催化剂。这种混合 Pt 基催化剂在 0.9 V 相对于 RHE 的电位下实现了 3.46 A mg _pt ^-1的质量活性，在 10,000 次循环后稳定性衰减可忽略不计。更重要的是，这种半电池活性可以在全电池水平上表现出来，具有 10.22 W mg _Pt ^-1_{阴极的高 Pt 利用率}在单电池中经过 30,000 次循环后具有出色的耐用性。实验和理论研究表明，通过将 Co/Ni 掺入 Pt 晶格中，可以诱导具有最佳 Pt-O 结合能的高应变 Pt 结构，这可以解释改进的反应动力学。由于氮掺杂纳米碳结构和活性 Pt 组分的协同催化作用是增强催化活性的原因。同时，纳米碳基质的强金属-载体相互作用和优化的亲水性能有助于有效的传质和水管理。这项工作可能为设计用于燃料电池及其他领域的低铂集成电催化剂提供重要见解。