Enhanced Activity for Oxygen Reduction Reactions by Carbon-supported High-index-facet Pt-Ti Nanoparticles

Abstract

Pt-Ti alloy nanoparticles (NPs) were synthesized over carbon-black supports via a wet-chemistry route. The prepared Pt-Ti NPs were atomically disordered and surrounded by high-index facets to have a spherical form. Controlled vacuum-annealing yielded atomically ordered Pt 0.75 Ti 0.25 NPs, which were surrounded by the low-index {111} facets. The spherical Pt-Ti NPs exhibited enhanced activity than pure Pt NPs or even faceted Pt 0.75 Ti 0.25 NPs toward the electrochemical oxygen-reduction reaction (ORR).

Tuning the surface electronic structure of a Pt3Ti(111) electro catalyst

“…For practical application the optimization of the ORR activity, especially of dispersed nanoparticles, is of relevance. 1,39 Here, UHV-STM methods are not applicable. However, Pt segregation to the outermost layer of the Pt 3 Ti(111) alloy is likely for Pt concentrations slightly higher than 75 at %.…”

Atomically Ordered Pt5La Nanoparticles as Electrocatalysts for the Oxygen Reduction Reaction

“…In addition, the ORR requires an overpotential of ∼200 to 250 mV when Pt is used as an electrocatalyst. To enhance the ORR performance of Pt, various efforts have been made on the design of Pt–T alloys (T = 3d transition metals such as Ti, Co, Ni, and Cu). − Pt–T alloys and core–shell catalysts exhibit enhanced mass and specific activities toward the ORR as compared to pure Pt electrocatalysts owing to their morphology, downshift of the d-band center, modification of the electronic state, and compressive strain . These effects can destabilize the intermediate OH species adsorbed on the Pt surface, thus enhancing the ORR kinetics.…”

Pt–Cu nanoalloy catalysts: compositional dependence and selectivity for direct electrochemical oxidation of formic acid

“…as reported earlier by us and several other research groups. [44][45][46][47][48] The performance of the nanoalloy Pt-Cu and commercial Pt catalysts was also tested using methanol and ethanol. All these catalysts showed activity for the oxidation of methanol and ethanol, which is, however, relatively inferior to the catalytic oxidation of FA, where both E o and i a were lower for the oxidation of methanol and ethanol as shown in Fig.…”