Composition-Controlled Synthesis of Bimetallic PdPt Nanoparticles and Their Electro-oxidation of Methanol

Abstract

PdPt alloy nanoparticles (NPs) are promising catalysts for various chemical reactions because of the presence of powerful catalytic components of Pt and Pd on the surface of one nanostructure. In this paper, we report a facile synthesis of polyhedral PdPt alloy NPs via coreduction of Pd(acac) 2 (acac = acetylacetonate) and Pt(acac) 2 with morpholine borane in oleylamine at 90 and 180 °C. In the synthesis, the molar ratio of the two metal precursors added in the reaction mixture was carried over to the final PdPt NP product, and compositions of the PdPt NPs were readily tuned from Pd 88 Pt 12 to Pd 34 Pt 66 . These PdPt NPs show the composition-dependent catalytic activity for methanol oxidation, with NPs in 40À60 atomic % Pt exhibiting the superior activity and durability.

Mixed-phase Pd–Pt bimetallic alloy on graphene oxide with high activity for electrocatalytic applications

“…The onset potential of methanol oxidation observed with GO/PdPt-03 was 0.50 V, while that for GO/Pd and GO/Pt was 0.64 V and 0.62 V, respectively. The onset potential with respect to the electro-oxidation mechanism of alcohol on Pt catalysts is basically related to the breaking of CeH bonds and subsequent removal of intermediates such as CO ad by the oxidation with OH ad supplied by PteOH sites or other sources to the electrooxidation mechanism of alcohol on Pt catalysts [33,34]. This result indicates that the bimetallic GO/PdPt demonstrated better performance for the promotion of CeH breaking and CO ad tolerance in the methanol electro-oxidation.…”

Nanoporous twinned PtPd with highly catalytic activity and stability

“…However, during the electrooxidation process, methanol is dehydrogenated into adsorbed carbonaceous intermediates on Pt atoms 1 , which heavily affect the catalytic capacity by the formation of strong Pt-CO bonds that lead to the degradation of catalytic activity. These issues have been addressed by combining Pt with other transition metals in various forms, known as the bi-functional catalytic mechanism, which is responsible for accelerating the oxidation and removal of carbonaceous molecules generated in the process [1][2][3][4][5][6][7][8][9][10][11][12] . For example, Pd can weaken the Pt-CO bond and promote the oxidation process of CO to CO 2 via water dehydrogenation, i.e.…”

“…the formation of Pd-OH. By adjusting the atomic ratio between Pt and Pd, the degradation and dehydrogenation processes of methanol can be coordinated effectively [7][8]12 .…”

An ultrasensitive electrochemical immunosensor for CEA using MWCNT-NH2 supported PdPt nanocages as labels for signal amplification

“…In recent years, carbon nanotubes have been promising materials for electrochemical biosensors on account of their high electronic conductivity, great chemical stability, high surface area and extremely high mechanical strength. 25,26 In addition, the application of PdPt bimetallic hollow nanocages affording more exposed active sites is also an innovative point in the eld of biosensing. For the nanomaterials, Pd-based NPs are highly efficient catalysts 19,20 to facilitate a large number of reactions including oxygen reduction and alkene hydrogenation and have been utilized in fuel cells and immunoassays.…”