Closure to “Discussion of ‘Preparation of Titanium by Fluoride Electrolysis’ [M. A. Steinberg, S. Carlton, M. E. Sibert, and E. Wainer (pp. 332–340)]”

Sibert, M. E.

doi:10.1149/1.2429978

Cited by 8 publications

(10 citation statements)

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“…Only in some cases it has been possible to do that, e.g., using very high frequencies and special equipment. 69 However, our impedance analysis (see the ESI, † Section S2, for further information about the equivalent electric circuit) shows that in the case of Pt(331) it is possible to distinguish several Faradaic adsorption processes with different time constants. Fig.…”

Section: Potentiodynamic Impedance Spectroscopy Experimentsmentioning

confidence: 96%

Elucidation of adsorption processes at the surface of Pt(331) model electrocatalysts in acidic aqueous media

Pohl

Čolić

Scieszka

et al. 2016

Phys. Chem. Chem. Phys.

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The Pt(331) surface has long been known to be the most active pure metal electrocatalyst for the oxygen reduction reaction (ORR) in acidic media. Its activity is often higher than those known for the Pt-based alloys towards ORR, being comparable with the most active Pt3Ni(111), Pt3Y or Pt5Gd, and being more active than e.g. polycrystalline Pt3Ni. Multiple active sites at this surface offer adsorption energies which are close to the optimal binding energy with respect to the main ORR intermediates; nevertheless, the exact location of these sites is still not clear. Taking into account the unique surface geometry of Pt(331), some adsorbates (including some oxygenated ORR-intermediates) should also contribute to the electronic structure of the neighbouring catalytic centres. However, the experimental elucidation of the specific adsorption of oxygenated species at this surface appears to be a non-trivial task. Such information holds the keys to the understanding of the high activity of this material and would enable the rational design of nanostructured ORR catalysts even without alloying. In this work, the electrified Pt(331)/electrolyte interface has been characterised using cyclic voltammetry (CV) combined with potentiodynamic electrochemical impedance spectroscopy (PDEIS) in 0.1 M HClO4 solutions. The systems were studied in the potential region between 0.05 V and 1.0 V vs. RHE, where the adsorption of *H, *OH and *O species is possible in both O2-free and O2-saturated electrolytes. Our CV and PDEIS results support the hypothesis that in contrast to Pt(111), many Pt(331) surface sites are likely blocked by *O species at the polymer electrolyte membrane fuel cell benchmark potential of 0.9 V (RHE). We propose a model illustrated by simplified adsorbate structures at different electrode potentials, which is, however, able to explain the voltammetric and impedance data, and which is in good agreement with previously reported electrocatalytic measurements.

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Section: Potentiodynamic Impedance Spectroscopy Experimentsmentioning

confidence: 96%

Elucidation of adsorption processes at the surface of Pt(331) model electrocatalysts in acidic aqueous media

Pohl

Čolić

Scieszka

et al. 2016

Phys. Chem. Chem. Phys.

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“…The mild medical abuse may be quite frequent; while the severe one is; fortunately; rare. McClure and colleagues (McClure;& Sibert;1996) searched child protection records in England and discovered medical abuse which mainly involved induction of illness such as suffocation and non-accidental poisoning. Based on their research the authors estimated a prevalence rate of 0.5 children in 100;000 children.…”

Section: Prevalence Of Medical Abusementioning

confidence: 99%

Medical Child Abuse: When Parents Harm Their Children

Rokach¹

2020

JPMHC

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“…(These matrices operate where Hs and Ss have dimension N/2 X N/2. Applying these transforms to eq 17 yields Af'HAsAf'U = Af'HA.A-'SA.UE (20) or HSUS = SsUsEs (21) We now apply the usual methods to find Us and Es, and backtransform the results to the original nonsymmetrized basis via U = A SUS (22) where U contains only N/2 symmetric eigenfunctions. A similar series of transforms produces the N/2 antisymmetric eigenfunctions.…”

Section: Quantum Correspondencementioning

confidence: 99%

Role of mode-mode energy flow in a model of the 1,5 hydrogen shift isomerization of malonaldehyde

Hutchinson¹

1987

J. Phys. Chem.

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tramolecular electron transfer induced by the solvation process takes place. This result is consistent with the fact that dual fluorescence from the locally excited state of the anthracene part and the intramolecular charge-transfer state has been observed in polar solvents.13c Recently, dipole moments of the excited equilibrium state (µ )as well as the Franck-Condon state (µ ) of the intramolecular charge-transfer systems have been determined by means of the electrooptical emission and absorption measurements.13 The values of µ, of AHMA in dioxane, fluorobenzene, 2-chlorobutane, and benzotrifluoride are obtained to be as large as 60 X 10~30 C m,13b_d which seems to be in agreement with the present results obtained by the transient absorption measurements.

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Closure to “Discussion of ‘Preparation of Titanium by Fluoride Electrolysis’ [M. A. Steinberg, S. Carlton, M. E. Sibert, and E. Wainer (pp. 332–340)]”

Cited by 8 publications

References 0 publications

Elucidation of adsorption processes at the surface of Pt(331) model electrocatalysts in acidic aqueous media

Elucidation of adsorption processes at the surface of Pt(331) model electrocatalysts in acidic aqueous media

Medical Child Abuse: When Parents Harm Their Children

Role of mode-mode energy flow in a model of the 1,5 hydrogen shift isomerization of malonaldehyde

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