Fig. 3: Origins and formation mechanisms of strains during alkaline NO3−RR. | Nature Communications

Fig. 3: Origins and formation mechanisms of strains during alkaline NO3−RR.

From: Reaction-driven formation of anisotropic strains in FeTeSe nanosheets boosts low-concentration nitrate reduction to ammonia

Fig. 3

a Operando Fe K-edge XANES spectra of FeTeSe nanosheets in 1 M KOH under OCP, in 1 M KOH + 10 mM KNO3 under OCP, during NO3−RR at −0.4 V for 20, 40, and 60 min. b, c Enlarged regions of (a). d, e FT k2-weighted Fe K-edge EXAFS spectra (d), and the corresponding contour map (e). The color bar represents intensity with unit of Å−3. f Changes of the normalized X-ray absorption coefficient under different conditions for Fe−O, Fe−Se, Fe−Te, and second-shell Fe−Te scattering paths. g Total X-ray scattering of the FeTeSe nanosheets before (red) and after (blue) electrolysis, as well as their difference pattern (green). h Scheme illustrating the in-situ formation of strained catalyst due to chalcogen vacancies and oxygen dopants in 2D FeTeSe nanosheets. i O 1 s spectra of the pristine FeTeSe nanosheets and those after catalysis in 1 M KOH under OCP, in 1 M KOH + 10 mM KNO3 under OCP, in 1 M KOH + 10 mM KNO3 at −0.55 V for 1, 2, and 4 h. OCP denotes open-circuit potential. Source data are provided as a Source Data file.

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