Although single-atom catalysts (SACs) are drawing wide attention because they offer properties that differ from those of conventional nanoparticle (NP)-based catalysts, the lack of neighboring metal centers to cooperate in catalysis limits their actual application in many important chemical processes. Here, we report the synthesis of multi-atom Pt catalyst that consists of cross-linked Pt-Pt metal centers stabilized by atomically dispersed ZnFe-N-C support through Pt-N bonds. XAFS analysis reveals that each Pt atom in the multi-atom Pt catalyst coordinates with ∼2.6 N atoms and ∼4.3 Pt atoms. This novel catalyst combines the merits of SACs and NPs, resulting in 100 % exposure of surface Pt atoms and excellent stability and fuel cell performance. With an ultralow Pt loading of 0.035 mg cm⁻² at the cathode, the fuel cell delivers a 1.02 W cm^-2 maximal power output. DFT calculations revealed that the strongly coupled Pt-N bond is critical for stabilizing the cross-linked Pt.

尽管单原子催化剂（SAC）由于其提供的性能不同于传统的基于纳米粒子（NP）的催化剂而受到广泛关注，但由于缺乏相邻的金属中心以配合催化作用，限制了它们在许多重要化学过程中的实际应用。在这里，我们报告了多原子铂催化剂的合成，该催化剂由通过原子分散的ZnFe-NC载体通过Pt-N键稳定的交联Pt-Pt金属中心组成。XAFS分析表明，多原子Pt催化剂中的每个Pt原子与〜2.6 N原子和〜4.3 Pt原子配位。这种新型催化剂结合了SAC和NP的优点，可100％暴露表面Pt原子，并具有出色的稳定性和燃料电池性能。具有0.035 mg cm ^-2的超低Pt负载在阴极，燃料电池提供1.02 W cm ^-2的最大功率输出。DFT计算表明，强耦合的Pt-N键对于稳定交联的Pt至关重要。