Fig. 2: Characterization of quinary FeCoNiCuPt HEA-NPs/G. | Nature Communications

Fig. 2: Characterization of quinary FeCoNiCuPt HEA-NPs/G.

From: Hydrocarbothermal flow synthesis of carbon-supported small and dense high-entropy alloy nanoparticles as electrocatalysts

Fig. 2

a SEM image of HEA-NPs/G. b Low-magnification STEM image of HEA-NPs/G. c Enlarged STEM image of HEA-NPs/G. d ADF-STEM image of HEA-NPs/G. The inset shows the statistical histogram of particle size and average size of HEA-NPs. The size is given as the mean ± standard deviation. e XRD pattern of HEA-NPs/G, indicating a single-phase FCC crystalline structure. f Atomic-resolution ADF-STEM image of an individual HEA-NP with a lattice spacing of 2.25 Å that corresponds to the (111) plane. g EDS elemental maps of HEA-NPs/G composed of five elements (Fe, Co, Ni, Cu, Pt) at low (top), medium (middle), and high (bottom) magnifications. h Size tunability by varying the flow rate of the Ar carrier gas during spray pyrolysis. i Stable reaction condition and high reproducibility of the synthetic method, demonstrated by the similar size and metal loading between samples collected at different times (1 h and 5 h). The data were shown as the mean ± standard deviation, where the mean values were derived from three independent measurements (with data points shown as circles). j A photograph of 1.25562 g of HEA-NPs/G in an analytical balance collected from a one-time continuous reaction.

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