Changes induced by transition metal oxides in Pt nanoparticles unveil the effects of electronic properties on oxygen reduction activity

Abstract

Relevance of electronic effects in oxygen reduction on Pt nanoparticles is unveiled taking advantage of metal–support interactions.

A New Generation of Platinum‐Copper Electrocatalysts with Ultra‐Low Concentrations of Platinum for Oxygen‐Reduction Reactions in Alkaline Media

“…It is noteworthy that our Pt−Cu NPs exhibit excellent activity on the bleeding edge, compared to most of the reported electrocatalysts . The high catalytic activity of Pt 0.25 Cu electrocatalyst may be due to optimum metal loading, the small size of NPs, twinned effects, and the excellent electron interaction . In this study, Pt−Cu NPs are rich in Cu, leading to enhanced catalytic activity.…”

“…In this study, Pt−Cu NPs are rich in Cu, leading to enhanced catalytic activity. The alloying Pt with 3d transition metals can change the electronic structure of Pt, thus prompting the O 2 reduction . The presence of Cu may enhance the OH ˗ generation, and thus improving CO tolerance .…”

H 2 ‐induced thermal treatment significantly influences the development of a high performance low‐platinum core‐shell PtNi/C alloyed oxygen reduction catalyst

“…Nevertheless, developing the more active and better durable Pt‐based catalysts are still imperative in achieving more efficient energy conversion. Preparation of the desired Pt alloyed catalysts paves the way in developing the next‐generation ORR catalysts, promising in replacing the commercial Pt/C . For instance, PtM (M = Cu, Ag, Fe, Co, Ni etc.)…”

“…Preparation of the desired Pt alloyed catalysts paves the way in developing the next-generation ORR catalysts, promising in replacing the commercial Pt/C. 14 For instance, PtM (M = Cu, 7 Ag, 15 Fe, 16 Co, 17 Ni 18,19 etc.) alloyed nanoparticles exhibit outstanding ORR performances due to the synergistic influences of electronic and geometric effects between Pt and nonprecious metals.…”

Phase Segregated Pt–SnO2/C Nanohybrids for Highly Efficient Oxygen Reduction Electrocatalysis

“…[19] Such nanoarchitectures are not easily accessible by conventional step-loading methods (i.e., initial deposition of MO x on carbon substrates followed by growth of Pt NPs), because the large lattice mismatch between the dominant crystal planes of Pt and most MO x materials leads to growth of Pt on the carbon substrates competing with the desired growth on MO x . [20,21] As a possible oxide support, tin dioxide (SnO 2 ) has the advantages of being stable in acidic media and possessing high corrosion resistance in the ORR process. In this work, we develop a phase-segregation method for synthesizing platinumtin oxide hybrids supported on carbon black (PtSnO 2 /C) in situ by airannealing PtSn alloy NPs supported on carbon black (PtSn/C).…”