Pt–Cu nanoctahedra: synthesis and comparative study with nanocubes on their electrochemical catalytic performance

Abstract

Pt-Cu nanoctahedra were successfully synthesized through a simultaneous reduction of platinum(II) acetylacetonate and copper(I)/(II) chloride in the presence of tungsten hexacarbonyl, oleylamine and oleic acid at high temperature. Comparative studies of electrocatalysis on Pt nanocubes, the {111}terminated Pt-Cu nanoctahedra and {100}-bounded Pt-Cu nanocubes with similar composition and size indicate that the activity of Pt-Cu nanocrystals towards formic acid oxidation is shape-dependent, and is higher than that of Pt nanocubes.

Recent Advances in the Synthesis and Electrocatalytic Applications of Platinum‐Based Bimetallic Alloy Nanostructures

“…This stabilization lowers the total surface energy of {1 0 0} faces and induces the formation of nanocubes. PtCu nanoctahedra (Figure B) were also synthesized successfully through a simultaneous reduction of Pt(acac) 2 and CuCl/CuCl 2 in the presence of tungsten hexacarbonyl, OAm, and oleic acid (OA) at 200 °C …”

Polyethyleneimine-assisted synthesis of high-quality platinum/graphene hybrids: the effect of molecular weight on electrochemical properties

“…21,22 The weak peak O 1 at 0.55 V and the strong peak O 2 at 0.9 V on the Pt/C electrocatalyst correspond to the direct dehydrogenation oxidation and indirect dehydration oxidation of formic acid, respectively (Fig. [27][28][29][30][31][32][33][34][35][36][37][38][39] The isolated Pt atom facilitates the direct dehydrogenation pathway of the FAOR (i.e., the ensemble effect). The ratio of the two peak currents (IO 1 /IO 2 ) is calculated to be 0.22, indicating that the FAOR on the Pt/C electrocatalyst occurs mainly through the indirect dehydration pathway.…”

“…4B-b). [27][28][29][30][31][32][33][34][35][36][37][38][39] Due to the adsorption of PEI-600 on the Pt surface, the contiguous Pt atoms on the Pt nanoparticle surface are interrupted by adsorbed N atoms, which facilitates the direct dehydrogenation pathway of the FAOR. For the Pt/RGO-600 hybrids, peak O 1 is signicantly enhanced (Fig.…”

Octahedral Noble‐Metal Nanoparticles and Their Electrocatalytic Properties

“…[44][45][46] By taking advantage of the reducing ability of CO and its oxidation to CO 2 on selected crys- Figure 2. [48] Similarly, the UPD-induced formation of Pt-Cu octahedral nanoalloys by employing a weak reducing agent, N,N-dimethylformamide, was presented by Zheng et al [49] They proposed that platinum ions with more positive reduction potential were reduced prior to copper precursors to form platinum nuclei followed by the UPD of copper preferentially onto the {111} surface of platinum. [38] B) SEM images of polyhedral structures of gold NCs with respect to the amount of AgNO 3 added to the reaction mixture.…”