Observation of the structural transition Pt(100) 1 × 1 → hex by LEED intensities

Heinz, K.; Lang, Elmar; Strauß, Karl; Müller, K.

doi:10.1016/0378-5963(82)90106-4

Cited by 101 publications

(20 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Energetics, atomic displacements and reconstructions are good agreement with available first principles calculations and experiments. New results on the 5× 29 reconstruction of the 001 Pt surface, which is too large for DFT calculations, are consistent with experimental suggestions that the reconstruction is more stable than the 5 × 1 reconstruction 42 . The full relativistic model SO-SCTB gave a much larger surface energy for the missing row reconstruction of the 011 surface than that obtained from the SR-SCTB model, consistent with earlier claims 39 that relativistic effects are required to stabilize this structure.…”

Section: Discussionsupporting

confidence: 70%

See 1 more Smart Citation

Relativistic tight-binding model: Application to Pt surfaces

Tchernatinsky

Halleý

2011

Phys. Rev. B

View full text Add to dashboard Cite

We report a parametrization of a previous self consistent tight binding model, suitable for metals with high atomic number in which nonscalar relativistic effects are significant in the electron physics of condensed phases. The method is applied to platinum. The model is fitted to DFT band structures and cohesive energies and spectroscopic data on platinum atoms in 5 oxidation states and is then shown without further parametrization to correctly reproduce several low index surface structures. We also predict reconstructions of some vicinal surfaces.

show abstract

Section: Discussionsupporting

confidence: 70%

“…We find that the SR-SCTB 5 × 1 surface energy is lower than the 1 × 1 SR-SCTB surface energy, but higher than 5 × 29 SR-SCTB surface energy. This supports the suggestion that the 5 × 1 reconstruction is a metastable state 42 . Finally, we applied our SR-SCTB model to calculate surface energies of the vicinal surfaces 210 and 310 .…”

Section: Pt Surfacessupporting

confidence: 79%

Relativistic tight-binding model: Application to Pt surfaces

Tchernatinsky

Halleý

2011

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…As a feedback mechanism the reconstruction of the central (100) plane is deduced directly from the FIM images. The cycle of reconstruction of (1·1) and lifting of hex structure is discussed in detail in [66], in this context it is noteworthy to remark, that the cycle is connected with a considerable change of density in the top Pt layer which has to eject about 20% of the atoms [67]. This process is combined with formation and dissolution of surface clusters which will be discussed below.…”

Section: Reaction Kineticsmentioning

confidence: 97%

Catalytic reactions on platinum nanofacets: bridging the size and complexity gap

Suchorski

Drachsel

2007

Top Catal

View full text Add to dashboard Cite

In this short review we present few selected sections of our own work on the catalytic reactions as studied on a nanoscale using the field emission and field ion microscopies (FEM/FIM) and the corresponding probe-hole techniques: magnetic field ion mass separation combined with the field ion appearance energy spectroscopy (FIAES) and an atom probe with a Wien-filter ion mass selection combined with the time of flight (ToF) and coincidence analyses. We focus on the CO respectively hydrogen oxidation on Pt nanofacets present on an apex of a Pt tip that serves as a model of a single catalytic pellet of a supported catalyst. Exhibiting a heterogeneous surface formed by different orientations, like a catalyst pellet, a Pt tip can be prepared and characterized with atomic resolution. Surface reactions in such a well-defined system can be monitored with a resolution of £ 2 nm by FEM or FIM and the reacting species originating from few selected surface sites can be analyzed by FIAES or ToF in a probe-hole experiment. By using the single tip the usual averaging of data over at least few catalytic pellets of the common array-type model catalyst is avoided and thus a ''smoothing out'' of the characteristics of the single particles can be eliminated. As a result, the correlation of processes on individual nanofacets and fluctuation effects can be studied in situ. Until now, the FIM/FEM techniques are known to be quite successful in studying the oscillating surface reactions on Pt and Rh surfaces. In the present review we concentrate, in turn, on the local reaction kinetics in the nanosized reaction systems as mirrored by spectroscopic measurements and on the fluctuation-induced deviations from the behaviour predicted by macroscopic rate laws.

show abstract

“…It might be correlated with the complicated gold oxidation process in sulfuric acid which involves chemical adsorption, electro-oxidation, possible gold dissolution and a potential induced surface reconstruction process [18,28,30,31,[33][34][35][36][37][45][46][47][48][49][50]. Based on the studies on the bulk gold electrode [46,51], under the condition A, a step like structure is believed to be formed with the "lifting" effect of some surface gold atoms from the change of surface energy due to specific adsorbed anions on the gold surface [52]. With the increasing of the upper limit potential to condition B, via STM, Kolb et al observed that the step-like structures start to vanish due to the instability under higher potential [45] and these structures will be removed completely when the potential reaches the condition C. This reported phenomena correlates well with what we observed for the electrocatalytic effects for the HER on the Au-NPs/GCE and bulk Au (Fig.…”

mentioning

confidence: 99%

Activation Effect of Electrochemical Cycling on Gold Nanoparticles towards the Hydrogen Evolution Reaction in Sulfuric Acid

Wang

Sun

Liao

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

A B S T R A C TThis article reports a study of electrochemical cycling effects on hydrogen evolution catalytic activity of gold nanoparticles in sulfuric acid. We found that after cycling within the double layer regime, up to 0.64 V vs RHE, there is a dramatic effect on the HER activity of gold nanoparticles: 128 mV drop of the overpotential, a decrease of 23 mV/dec for the Tafel slope as well as a nearly twenty times increase of the turn-over frequency (TOF). This enhanced activity is tentatively assigned to the formation of stepped like structures by the consecutive electrochemical cycling in the double layer region.

show abstract

Observation of the structural transition Pt(100) 1 × 1 → hex by LEED intensities

Cited by 101 publications

References 20 publications

Relativistic tight-binding model: Application to Pt surfaces

Relativistic tight-binding model: Application to Pt surfaces

Catalytic reactions on platinum nanofacets: bridging the size and complexity gap

Activation Effect of Electrochemical Cycling on Gold Nanoparticles towards the Hydrogen Evolution Reaction in Sulfuric Acid

Contact Info

Product

Resources

About