Fig. 2: Materials characterization of Fe/Cu dual atoms catalyst.
From: Fe/Cu diatomic catalysts for electrochemical nitrate reduction to ammonia
a HAADF-STEM image of Fe/Cu-HNG. b Zoomed-in HAADF-STEM image indicates the formation of dual atoms sites where two distinct adjacent bright dots were marked with blue dashed circles. c Corresponding intensity profiles of dual atoms pair. d STEM and e EDX elemental mapping images of C, N, Fe, and Cu in Fe/Cu-HNG. f Statistical distribution of Fe/Cu distance of the observed diatomic pairs. g EELS spectrum of Fe/Cu atomic sites. h N2 adsorption–desorption isotherms of Fe/Cu-HNG (inset: corresponding pore-size distribution). i XRD pattern of Fe/Cu-HNG.
