Fig. 2: Characterization of the Cu-Ag model catalyst. | Nature Communications

Fig. 2: Characterization of the Cu-Ag model catalyst.

From: Unraveling the synergistic effects of Cu-Ag tandem catalysts during electrochemical CO2 reduction using nanofocused X-ray probes

Fig. 2: Characterization of the Cu-Ag model catalyst.

a Schematic illustration of the developed synthesis route for isolated Cu-Ag NPs on an electrically conductive GC substrate. b Representative ADF-STEM-EDX mapping of a single, bimetallic NP (Cu0.88Ag0.12 catalyst). c Corresponding ADF-STEM image revealing the Cu-Ag interface and d the elemental distribution obtained from the EDX line-scan (c). e, f Representative SEM images of Cu0.88Ag0.12 and g, h corresponding SEM-EDX elemental mappings before and after eCO2RR in an H-cell setup in CO2-saturated 0.1 M KHCO3 electrolyte at room temperature. i GI-XRD analysis of the spent Cu0.88Ag0.12 catalyst revealing the presence of segregated Cu0 and Ag0 phases, according to the corresponding reference patterns shown as blue and red vertical bars, respectively. Broad reflections indicated by dark gray asterisks can be attributed to the GC substrate. j Nanofocused X-ray characterization techniques for the identification of active sites via combined structural and chemical analyses under reaction conditions.

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