Mechanism for oxidative dissolution of a Cr atom from a Pt surface: molecular orbital theory

Article Abstract:

A study was conducted to analyze a mechanism for the oxidative dissolution of a chromium atom from the Pt(111) surface. The semiempirical atom superposition and electron delocalization molecular orbital theory were utilized to carry out the analysis. Experimental results indicated that increases in the potential would reduce the OH bond scission activation energy barriers. Findings also showed that PtOH is held in the surface because of the blocking of the surface sites by adsorbed H2O.

Research, Platinum, Atoms, Surface chemistry, Scission (Chemistry), Chromium, Chromium (Metal)

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Activation energies for oxygen reduction on platinum alloys: Theory and experiment

Article Abstract:

A combined theoretical and experimental analysis of the electrode potential dependencies of activation energies is presented for the first step in oxygen reduction over platinum and platinum alloy catalysts in both polycrystalline carbon supported form. Tafel data for several of the catalysts are used to predict potential dependent activation energies for oxygen reduction over the 0.6-0.9 V range in strong and weak acid.

Electric properties, Chemical research, Platinum compounds, Carbon compounds

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Oxygen electroreduction on Fe(super II) and Fe(super III) coordinated to N4 chelates. Reversible potentials for the intermediate steps from quantum theory

Article Abstract:

Fe(super II) is the potential active site for the four-electron reduction of oxygen by heat-treated iron macrocycles. The hydrogen-bonding interaction between (OHOH) bonded to FeII and a nitrogen lone-pair orbital in the N4 chelate is discussed.

Oxygen, Industrial Gas Manufacturing, Industrial gases, Hydrogen bonding, Hydrogen bonds, Iron, Iron (Metal), Properties

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