Nanomagnetic CoPt truncated octahedrons: facile synthesis, superior electrocatalytic activity and stability for methanol oxidation

Abstract

Nanomagnetic CoPt truncated octahedral nanoparticles (TONPs) were successfully synthesised through a facile one-pot strategy. These single crystal CoPt TONPs with an average size of about 8 nm exhibit excellent electrocatalytic performance of both activity and stability for methanol oxidation reaction (MOR). The mass and specific activities of CoPt TONPs is 8 and 6 times higher than that of standard commercial Pt/C, respectively. After accelerated durability test (ADT), the loss of electrochemical surface area (ECSA) for CoPt TONPs is only 18.5%, which is significantly less than that of commercial Pt/C (68.2%), indicating that CoPt TONPs possess much better stability than commercial Pt/C in the prolonged operation. The Curie temperature of CoPt TONPs down to 8 nm is as high as 350 K with weak ferromagntism at room temperature (RT), which is greatly valuable for recycling in the eletrocatalytic applications.

Efficient Synthesis of Bimetallic Pt3Zn Alloy Nanocrystals with Different Shapes and their Enhanced Electrocatalytic Activity

“…In the forward scan, the forward peak at high potential (around 0.56 V) was corresponding to MOR, which was first oxidized to CO 2 , CO and other carbonaceous intermediates. The backward peak at around 0.2 V was owing to the removal of incompletely oxidized absorbed CO or other carbonaceous intermediates . The specific current density of the Pt 3 Zn (AA), Pt 3 Zn (Glc) and Pt 3 Zn (SC) showed excellent MOR oxidation specific activities of 1.69, 1.40 and 1.47 mA cm Pt −2 , which were about 2.73, 2.26 and 2.37 times higher than that of Pt/C (0.62 mA cm Pt −2 ).…”

One-step synthesis of the PdPt bimetallic nanodendrites with controllable composition for methanol oxidation reaction

“…Based on this case, various structures have been successfully generated for Pt-based bimetallic nanostructures in a wide range of elements, such as PtPd [6−11], PtCu [12,13], PtAg [14], PtCo [15,16], PtAu [17,18], PtNi [19 −21], PtRu [22−25], and PtFe [26]. By comparison, given that Pd and Pt have nearly the same structures (the same group of the periodic table, the face-centered cubic (fcc) crystal structure and the similar lattice constants) [27,28], the PdPt bimetallic nanoparticles (NPs) are especially attractive for catalyzing multiple reactions due to the presence of the powerful catalytic components of Pd and Pt.…”

Lithographic patterning of ferromagnetic FePt nanoparticles from a single-source bimetallic precursor containing hemiphasmidic structure for magnetic data recording media

“…Magnetic nanoparticles (NPs), owing to their designable functional properties, are regarded as an important class of artificial nanostructured materials in various fields, such as electrocatalysis, magnetic data storage, and biomedical applications [1][2][3][4][5][6][7][8][9][10][11]. Monodisperse L1 0 FePt NPs with nearly equal atomic ratio exhibit high magnetocrystalline anisotropy and have a chemically ordered facecentered tetragonal (fct) structure [12], which are also considered as the prospective activated materials for the next-generation data storage system [13].…”