Abstract

NaNbO3 microcubes with Pd for application in an Alkaline Direct Ethanol Fuel Cell (ADEFC) anode with high performance and minimal amounts of Pd are investigated herein. The Pd heterostructure on NaNbO3 is evaluated in two different structures NaNbO3–Pd/C and NaNbO3@Pd/C. NaNbO3–Pd/C electrocatalyst presents a less positive Eonset for CO-stripping. The NaNbO3–Pd/C electrocatalyst exhibits lower Pd and Nb mass losses compared to NaNbO3@Pd/C during the 24-h experiment. A single ADEFC experiment has 18 mW cm−2 at 50 and 60 °C using only 0.16 mg cm−2 of Pd for NaNbO3–Pd/C production. This Pd metallic loading is 6-fold lower than that of commercial Pd/C (AA). Experimental evidence indicates that the electronic effect between Pd and Nb and the high EASA are the likely reasons for these findings. Therefore, NaNbO3 microcubes with Pd may be an advantageous electrocatalyst for applications in ADEFC anodes.

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