Fig. 2: Physicochemical property characterization.
From: Coordination modulation of iridium single-atom catalyst maximizing water oxidation activity
a XRD pattern of the Ir1/NFS and Ir1/NFH. b XPS spectra of Ir 4f region with fitting curves for Ir1/NFS and Ir1/NFH. c–e XPS spectra of (c) S 2p, (d) Ni 2p, and (e) Fe 2p regions with fitting curves for Ir1/NFS and NFS.
