RESEARCH / A0226
Spatial engineering and d-orbital coupling in axial dual-atom sites for bifunctional
Read the original paper · 10.1038/s41467-025-66362-y ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Fig. 2 |Synthesis and characterization of FeCo-ADA. Aberration-corrected HAADF-STEM images of a, FeCo-ADA, c, FeCo-BDO. The distance distribution between neighboring atoms in b, FeCo-ADA, d, FeCo-BDO. The insets in panel depict the HAADF-STEM image and the proposed structural model of a typical neighboring atom pair. e, HAADF-STEM image and corresponding EDS mapping images. f, AFM image of FeCo-ADA. g, XRD patterns of FeCo-ADA. The inset in panel depicts the intensity profiles of the two atoms labeled in (a). The black, blue, yellow, and purple balls represent carbon, nitrogen, iron, and cobalt atoms, respectively. h, Fe K-edge XANES spectra. i, FT-EXAFS spectra. j, Experimental Fe K-edge XANES spectra and the corresponding theoretical spectra of FeCo-ADA. k, FT-EXAFS fitting curves at the R space of FeCo-ADA. The black, blue, yellow, and purple balls represent carbon, nitrogen, iron, and cobalt atoms, respectively.
Fig. 4 |In-situ X-ray absorption near-edge structure spectroscopy and the reaction pathways. In-situ XANS spectra of Fe (a) and Co (c) K-edge during ORR. The trend of the oxidation states of Fe (b) and Co (d) at different ORR potentials. In situ XANS spectra of Fe (e) and Co (g) K-edge during OER. The trend of the oxidation