Palladium–nickel alloys loaded on tungsten carbide as platinum-free anode electrocatalysts for polymer electrolyte membrane fuel cells

Abstract

The strong interaction between PdNi alloys and WC makes PdNi/WC a novel Pt-free electrocatalyst for the anode hydrogen oxidation reaction of polymer electrolyte membrane fuel cells with activity and stability comparable to those of the conventional Pt/C catalysts.

Improved ethanol electrooxidation performance by shortening Pd–Ni active site distance in Pd–Ni–P nanocatalysts

“…15, OH − shows preferential adsorption on Ni atoms, which is in good agreement with experimental observation26. This can be ascribed to the electrostatic attraction between OH − and Ni atom that carries significantly positive charge262844 demonstrated by Hirshfeld charge analysis (Supplementary Table 5). However, the P atom carries significant negative charge and Pd atom is almost electrically neutral in Pd–Ni–P ternary catalysts, which is in accord with our XPS results.…”

Bifunctional Electrocatalysis on Pd‐Ni Core–Shell Nanoparticles for Hydrogen Oxidation Reaction in Alkaline Medium

“…Different synthesis routs can lead to the formation of NiPd alloy, core–shell Pd@Ni or core–shell Ni@Pd nanoparticles, depending on the reaction sequence. One‐step reduction of Pd(II) and Ni(II) solution usually leads to alloyed nanoparticles with atomic composition according to the stoichiometry of the reagents . More generally, the core–shell structure can be achieved through two‐step reactions.…”

An Effective Pd–Ni2P/C Anode Catalyst for Direct Formic Acid Fuel Cells

“…XPS was applied to probe the origin of the promotional effect of Ni 2 P. From Pd to Pd–Ni 2 P/C (Figure 4), the Pd 3d peaks are shifted significantly, by about 1 eV, to a lower binding energy. This shift might be attributed to an partial electron transfer from Ni 2 P to Pd; this would increase the electron density of Pd and enhance the penetration of outer‐layer electrons to the inner layer 7. This results in higher shielding of the nuclear charge and weakens the binding of 3d electrons.…”