Surface X-ray scattering studies of the growth of Pd thin films on the Pt(001) electrode surface and the effects of the adsorption of CO

Formic acid oxidation on Pd-modified Pt(100) and Pt(111) electrodes: A DEMS study

“…The methodology employed for the Pd adlayer was similar to that previously reported [25][26][27][28][29]31]. Very briefly, both Pt(100) or Pt(111) clean surfaces were immersed at 0.10 V in a 10 )5 M PdSO 4 dissolved in 0.1 M H 2 SO 4 in meniscus configuration.…”

“…Additionally, an improvement in the electrocatalytic activity on Pt(100) electrodes modified with Pd sub-monolayers was observed, with an onset potential as low as 0.12 V. The full palladium monolayer showed a somewhat smaller catalytic activity. On Pt(111) electrodes, no significant increase in electrocatalytic activity was reported when the palladium coverage was below the monolayer range [25][26][27][28][29]. When more than a monolayer was deposited, the onset potential for formic acid oxidation shifted to more negative potentials (0.2 V).…”

“…This increase in activity was more significant as the Pd coverage increased above the monolayer range. The different method of adlayer preparation could be the origin of the observed differences, since the electrodeposition method seems to produce more uniform adlayers [25][26][27][28][29].…”

Carbon Monoxide Adsorption on Cobalt-Deposited Platinum Single Crystal Surfaces Investigated by IR Reflection-Absorption and Low-Energy Electron Diffraction

“…Alloying of Pt with Fe, Ni, Co, Pd, Ru, etc. improves the carbon monoxide (CO) tolerance of the anode electrode surface in fuel cells [9][10][11][12][13]. Furthermore, Markovic and co-workers found a volcano-type relation between the surface electronic structure (the d-band center) and oxygen reduction reaction (ORR) activities for Pt 3 M, where M = Ni, Co, Fe, Ti, V; Pt 3 Co is most active for the ORR that proceeds on the cathode electrode [14,15].…”

Stability of underpotentially deposited Ag layers on a Au(111) surface studied by surface X-ray scattering

“…Underpotential deposition (upd) is one of the best techniques to prepare ultrathin metal films on single crystal electrode surfaces with well-defined atomic arrangements [1][2][3]. The potential dependent structures of upd metal films with atomic resolution have been studied in situ by scanning tunneling microscopy (STM) [1,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], atomic force microscopy (AFM) [22,23], and surface X-ray scattering (SXS) [24][25][26][27][28][29][30][31][32].…”