Fig. 2: Characterization of nitroprussides.

a PXRD patterns and b FT-IR spectra of FeCo-NP-n. c Nitrogen sorption isotherms of FeCo-NP and FeCo-NP-24, and d Fe 2p XPS spectra of FeCo-NP and FeCo-NP-24. Source data for Fig. 2 are provided as a Source Data file.