Abstract
High stability, availability of multiple oxidation states and accessibility within wide electrochemical window are the prime features of Nb that make it a favorable candidate for electrocatalysis, especially when combined with Pt. However, Nb was used as a support in form of oxides in all previously reported Pt-Nb electrocatalysts, and no Pt-Nb alloying phase has been demonstrated hitherto. Herein, we report a multifunctional Pt-Nb composite (PtNb/NbOx-C) where Nb exists both as an alloying component with Pt as well as an oxide support which is synthesized by means of a simple wet chemical method. In this work, the Pt-Nb alloy phase has been firmly verified for the first time by multiple spectroscopic methods. This allows for the first experimental evidence of the theoretical prediction that Pt-Nb alloy improves the oxygen reduction reaction (ORR) activity of Pt. In addition, such a combination of multi-phase Nb brings up myriad features encompassing increased ORR durability, immunity to phosphate anion p...
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