Fig. 2: Structural characterizations of Ir single atoms on CoOOH nanosheets.
From: Selectively anchoring single atoms on specific sites of supports for improved oxygen evolution
a, b HAADF-STEM images of Ir1/TO–CoOOH (a) and Ir1/VO–CoOOH (b). Singly-dispersed Ir atoms are indicated by yellow circles. c, d EDX elemental mapping of Ir1/TO–CoOOH (c) and Ir1/VO–CoOOH (d). e, f Normalized XANES (e) and EXAFS (f) spectra at the Ir L3-edge for Ir1/TO–CoOOH and Ir1/VO–CoOOH. Ir powder, IrCl3, and IrO2 were used as references. g Experimental and fitting EXAFS results of Ir1/TO–CoOOH and Ir1/VO–CoOOH. The experimental and fitting results are shown in solid lines and circles, respectively. The inset atomic models are the first-shell coordination of Ir. The red, yellow, and purple spheres represent O, Cl, and Ir atoms, respectively. h Cl 2p XPS spectrum of Ir1/TO–CoOOH. i Co L-edge XAS spectra of CoOOH, Ir1/TO–CoOOH, and Ir1/VO–CoOOH.
