fig5

Figure 5. (A) In situ Raman spectra of Mn-ZIF-67 collected from OCP to 1.80 V vs. RHE in 1.0 M KOH. (B) TEM and (C) HRTEM images of Mn-ZIF-67 after the OER. High-resolution XPS scans of as-prepared Mn-ZIF-67 compared to the post-OER test for (D) Co 2p and (E) Mn 2p. OER: Oxygen evolution reaction; OCP: open-circuit potential; ZIF-67: zeolitic imidazolate framework-67; RHE: reversible hydrogen electrode; TEM: transmission electron microscopy; HRTEM: high-resolution transmission electron microscopy; XPS: X-ray photoelectron spectroscopy.