Tan, Y., Li, A., Wang, Y., Jiang, X., Cheng, Y., Chao, D., Zhang, Y. and Cheng, C. 2026. Modulation of the Spin State of Atomic Fe-N4 Sites with Interlayer-Adjacent Ir-N4 for Superior ORR Activity. Nano-Micro Letters. 18, (Mar. 2026), 272. DOI:https://doi.org/10.1007/s40820-026-02108-9.