Mass spectrometric and modeling investigations of bimetallic silver–cobalt clusters

Pt-free silver nanoalloy electrocatalysts for oxygen reduction reaction in alkaline media

“…The 3d post transition metals (TM) cobalt and nickel which are well-known alloying elements in Ptbased systems, are immiscible with silver in bulk. 159,160 Theoretical studies of small and large Ag-Co nanoclusters showed that Ag atoms tend to occupy surface sites 161,162 . DFT studies for Ag-Ni system have validated that Ag atoms tend to occupy surface sites.…”

Global optimization of small bimetallic Pd–Co binary nanoalloy clusters: a genetic algorithm approach at the DFT level

“…73 The overall effect is for core segregation of Co and surface segregation of Pd, with this core-shell type of segregation (which is related to the lower surface energy of Pd compared to Co, since the element having smaller surface energy and cohesive energy favours occupying the surface to minimise the total energy 74 ) also predicted for larger PdCo clusters. 75 Janssens et al 76 found that with fewer than 50 atoms, for Ag n Co m with n c m the cobalt dopants occupy highly coordinated sites and are strongly bound, for clusters with m c n the silver atoms are poorly coordinated surface atoms and are loosely bound. The GM structure of Pd 5 Co is an octahedron (C 4v symmetry) in the quartet magnetic state.…”

Improved signal stability from a laser vaporization source with a liquid metal target

“…The study of mixed metal clusters is emerging as an important research area, but they are difficult to make. [20][21][22] Some control over the cluster composition can be obtained by adjusting the pulse energy and position of the vaporization lasers. [15][16][17] More recently, they have been prepared by laser vaporization of an alloy rod 18 and from targets generated by mixing and pressing metal powders.…”