fig4

Figure 4. Structural characterization of Ir-NiCoP/Ni₅P₄@NiFe-LDH-1-O_V before and after electrochemical cycling. (A) XPS of Ni 2p; (B) Co 2p; (C) Fe 2p; (D) Ir 4f; (E) O 1s; (F) P 2p; (G) TEM image of Ir-NiCoP/Ni₅P₄@NiFe-LDH-1-O_V after electrochemical cycling; (H) HRTEM image. LDH: Layered double hydroxide; XPS: X-ray photoelectron spectroscopy; TEM: transmission electron microscopy; HRTEM: high-resolution TEM.