Fig. 1: Structural characterizations of catalysts. | Nature Communications

Fig. 1: Structural characterizations of catalysts.

From: Splicing the active phases of copper/cobalt-based catalysts achieves high-rate tandem electroreduction of nitrate to ammonia

Fig. 1: Structural characterizations of catalysts.The alternative text for this image may have been generated using AI.

a Schematic illustration of the preparation of a Cu/Co-based binary ‘tandem catalyst’. SEM images of the ZIF-Co-R precursor (b), CuCoSP_no (c) and CuCoSP (d) on the Cu foil substrate. The inset figures are the SEM images at higher magnification. e, f Typical TEM image, EDX mappings, SAED patterns and HR-TEM image of CuCoSP_no (e) and CuCoSP (f). Unlabelled scale bars are 100 nm. The SAED patterns in (f) show the presence of CuO phases and Co-based oxides/hydroxides (CoOx(OH)y), where 1 = Co(OH)2 (100), 2 = Co(OH)2 (101), 3 = CuO (20\(\bar{2}\)), 4 = CoOOH (211) and 5 = CoO (220). The purple colours of the HR-TEM image in (f) are marked to guide the eye and correspond to the Co3O4 nanocrystals. g EDX line−scan of a selected area marked by the white arrows in (e) and (f). h XPS-determined atomic percentage-depth profile of CuCoSP_no and CuCoSP as a function of Ar+ etching time. 2-MI 2-methylimidazole; EC-MOF electrochemically conversion of metal-organic frameworks.

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