X NWs are prepared by a solution-based method wherein the chemical composition canīe readily and predictably controlled. X nanowires (NWs) encapsulated with a conformal Pt monolayer shell (Pt~Pd In this report, we examine the composition- and size-dependent performance in The increasedĪctivity and catalytic performance is accompanied by improved durability toward ORR.Ħ. In addition, core-shell Pt~PdĩAu nanowires have been prepared by electrodepositing a Pt monolayer shell and theĬorresponding specific, platinum mass, and platinum group metal mass activities wereįound to be 0.95 mA/cm2, 2.08 A/mgPt and 0.16 A/mgPGM, respectively. Specifically, PdĤPt nanowires possess oxygen reduction reaction (ORR) activities of 0.49 and 0.79 mA/cmĢ, respectively, which are larger than the analogous value for commercial Pt nanoparticles Reduction as compared with commercial Pt nanoparticles and other 1D nanostructures,Īs a result of their homogeneous alloyed structure. Our as-prepared nanowires maintain significantly enhanced activity toward oxygen X nanowires with control over composition and size We have employed an ambient, template-based technique that is simple, efficient,Īnd surfactantless to generate a series of The specific and platinum mass activity of the core-shell catalysts was foundĢ and 1.74 A/mg as the diameter was decreased from the submicrometer size regime toĥ. Platinum monolayer overcoating was reliably deposited onto the surface of the Pd nanowiresīy Cu underpotential deposition (UPD) followed by galvanic displacement of the CuĪdatoms. Trend in oxygen reduction reaction (ORR) electrocatalysis. Moreover, as-prepared submicrometer and nanosized wires were studiedīy comparison with ultrathin 2 nm Pd nanowires in order to elucidate the size-dependent In order to determine that a unique two-step growth process predominates within the Nanowires, free-standing nanowire arrays, and cross sections of the filled template Has been extensively explored, and we have carried out characterization of the isolated Nanowires or as ordered free-standing arrays. Of 270 ± 45 nm and 45 ± 9 nm, respectively, and could be isolated either as individual The nanowires grown in 200 and 15 nm polycarbonate template pores maintain diameters High-quality, single crystalline Pd nanowires. In this report, we utilize the U-tube double diffusion device as a reliable, environmentallyįriendly method for the size-controlled synthesis of Testing, and it was found that the area-specific activity increased by 1.5 fold afterĤ. Nanowires also maintained excellent electrochemical durability under accelerated half-cell Pt nanoparticles, core-shell nanoparticles, and acid-treated nanowires. Pt, respectively, which were significantly enhanced as compared with conventional commercial Were found to maintain outstanding area and mass specific activities of 0.77 mA/cm Of the acid and ozone-treated nanowires were assessed, and the ozone-treated nanowires Subsequently, the desired nanowireĬore-Pt monolayer shell motif was reliably achieved by Cu underpotential depositionįollowed by galvanic displacement of the Cu adatoms. Selectively remove undesirable organic residues. Two distinctive treatment protocols followed by selective CO adsorption in order to As-prepared wires are activated by the use of Initially, ultrathin Pd nanowires with diameters of 2.0 ± 0.5 nm were generated,Īnd a method has been developed to achieve highly uniform distributions of these catalysts Ultrathin Pt monolayer shell–Pd nanowire core catalysts. We report on the synthesis, characterization, and electrochemical performance of Our ultrathin, acid-treated, unsupported nanowires displayed an electrochemicalĢ, which was nearly 4 times greater than that of analogous, unsupported platinum nanotubesĪnd 7 times greater than that of commercial supported platinum nanoparticles.ģ. Of both supported and unsupported Pt nanoparticles as well as with previously synthesized Nanowires toward the oxygen reduction reaction was studied in relation to the activity Nanowires with a diameter of 1.3 ± 0.4 nm. An acid-wash protocol was employed in order to yield highly exfoliated, crystalline Ultrathin Pt nanowires with a diameter of less than 2 nm. We report on the synthesis, characterization, and electrocatalytic performance AgĪnd Au nanowires also evinced reasonable ORR activity in alkaline solution.Ģ. Higher ORR activity as compared with that of commercial Pt nanoparticles alone. Specifically, Pt 1-D nanostructures possessed a two-fold Was specifically demonstrated in their manifestation as electrocatalysts for an oxygen The potentialĪpplicability of such crystalline, highly purified 1-D samples for practical uses One-dimensional (1-D) metal (Ag, Au and Pt) nanowires and their corresponding arrays have been synthesized using an ambient, surfactantless synthesis technique.
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