Figure 1. Structural characterization of Ir-NiCoP/Ni5P4@NiFe-LDH-1-OV. (A) XRD. (B) XPS of Ni 2p; (C) Co 2p; (D) Fe 2p; (E) Ir 4f; (F) EPR of the samples. EPR: Electron paramagnetic resonance; XRD: X-ray diffraction; LDH: layered double hydroxide; XPS: X-ray photoelectron spectroscopy.