Fig. 3: Metal component distributions in Pt20Pd20Cu60/C catalyst before and after potential cycling. | Nature Communications

Fig. 3: Metal component distributions in Pt20Pd20Cu60/C catalyst before and after potential cycling.

From: Alloying–realloying enabled high durability for Pt–Pd-3d-transition metal nanoparticle fuel cell catalysts

Fig. 3

a, b STEM-EELS elemental mapping images and corresponding EELS line-scan profiles for the as-prepared (thermochemically calcined) catalyst. c, d STEM elemental mapping images and corresponding EELS line-scan profiles for the catalyst after 20,000 cycles (electrochemically cycled) by accelerated durability test in a standard electrochemical cell. The exact atomic compositions determined by energy-dispersive X-ray spectroscopy (EDS) are Pt21Pd21Cu58 and Pt27Pd27Cu46 for the as-prepared and the 20,000-cycled Pt20Pd20Cu60/C, respectively. e Illustration of the metal component distribution of the ternary NP before (Alloy) and after (Realloyed) potential cycling based on the results shown in b and d. The intermediate “Dealloyed” NP is also included for comparison.

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