Response to discussion of the paper by Barber et al. [J. Electroanal. Chem. 446 (1998) 125] in the Short Communication by J.-P. Diard et al. [J. Electroanal. Chem. 466 (1999) 122]

Barber, J.; Conway, B. E.

doi:10.1016/s0022-0728(99)00136-9

Cited by 136 publications

(244 citation statements)

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“…However, Markovic et al [6,14] suggested that H opd plays some role in HER and HOR. Since the upd of H is sensitive to the crystallographic orientation of the Pt surface [5,8,14,15], this suggestion can reasonably explain the structural dependence of HER and HOR kinetics. Although the structural dependence is out of scope in the present study, we would like to discuss below the role of H upd in HER in the context of aforementioned results with the aid of rich information from surface science in UHV [9].…”

Section: Role Of H Upd In Hermentioning

confidence: 75%

“…2). In our previous publication [22], the deviation was tentatively explained in terms of supersaturation effect of H 2 at the interface, which can give an apparent Tafel slope around 30 mV/decade independent of the mechanism [3,4,15,54,55].…”

Section: Kinetic Analysis Of the Spectrum Of Terminal Hmentioning

confidence: 99%

“…Although a θ H(a) versus η plot for a polycrystalline Pt electrode determined by ac impedance in 0.5 M H 2 SO 4 has been reported in the literature [53], the data was obtained unfortunately with an unactivated (i.e., contaminated) electrode. Therefore, we tentatively use the θ H(a) versus potential plots for Pt(111), (110), and (100) in 0.5 M H 2 SO 4 [15] by assuming that our polycrystalline electrode surface is a mixture of the single-crystal domains. Specifically, the coverages we used for the data analysis were 0.3 (for (100)), 0.55 (for (110)), and 0.65 (for (111)) at -50 mV.…”

Section: Kinetic Analysis Of the Spectrum Of Terminal Hmentioning

confidence: 99%

“…The kinetics of HER exhibits a Tafel slope of ca 30mV/decade commonly on Pt(poly), (111), (110) and (100) in acidic media [3,7,[10][11][12][13], from which HER on Pt in acidic media is generally believed to occur via the Volmer-Tafel mechanism with the latter being rate-determining [1][2][3]. However, recent studies using rotating single-crystal electrodes suggested that the kinetics depends on crystallographic orientation of the electrode surface [6,14,15]. The Volmer-Tafel and Volmer-Heyrovsky mechanisms were proposed for Pt (110) and Pt(100), respectively [6,14].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy

Kunimatsu

Senzaki

Samjeské

et al. 2007

Electrochimica Acta

153

146

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Hydrogen evolution reaction (HER) on a polycrystalline Pt electrode has been investigated in Ar-purged acids by surface-enhanced infrared absorption spectroscopy and electrochemical kinetic analysis (Tafel plot). A vibrational mode characteristic to H atom adsorbed at atop sites (terminal H) was observed at 2080-2095 cm -1 . This band appears at 0.1 V (RHE) and grows at more negative potentials in parallel to the increase in hydrogen evolution current. Good signal-to-noise ratio of the spectra enabled us to establish the quantitative relation between the band intensity (equivalently, coverage) of terminal H and the kinetics of HER, from which we conclude that terminal H atom is the reaction intermediate in HER and the recombination of two terminal H atoms is the rate determining step. The quantitative analysis of the infrared data also revealed that the adsorption of terminal H follows the Frumkin isotherm with repulsive interaction.

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Section: Role Of H Upd In Hermentioning

confidence: 75%

Section: Kinetic Analysis Of the Spectrum Of Terminal Hmentioning

confidence: 99%

Section: Kinetic Analysis Of the Spectrum Of Terminal Hmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy

Kunimatsu

Senzaki

Samjeské

et al. 2007

Electrochimica Acta

153

146

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show abstract

“…The backscattered photons are then, typically, detected in a calorimeter, and the helicity asymmetry is extracted from the rates measured in the calorimeter for the different beam helicities. Compton polarimeters have been developed and installed at HERA [350], NIKHEF [349], and JLab Hall A [351]; we refer the reader to these references for a more complete technical description of Compton polarimetry.…”

Section: Overview Of Compton Polarimetrymentioning

confidence: 99%

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Plaster¹

2004

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The nucleon elastic electromagnetic form factors are fundamental quantities needed for an understanding of nucleon and nuclear electromagnetic structure. The evolution of the Sachs electric and magnetic form factors with Q 2 , the square of the fourmomentum transfer, is related to the distribution of charge and magnetization within the nucleon. High precision measurements of the nucleon form factors are essential for stringent tests of our current theoretical understanding of confinement within the nucleon.Measurements of the neutron form factors, in particular, those of the neutron electric form factor, have been notoriously difficult due to the lack of a free neutron target and the vanishing integral charge of the neutron. Indeed, a precise measurement of the neutron electric form factor has eluded experimentalists for decades; however, with the advent of high duty-factor polarized electron beam facilities, experiments employing polarization degrees of freedom have finally yielded the first precise measurements of this fundamental quantity.Following a general overview of the experimental and theoretical status of the nucleon form factors, a detailed description of an experiment designed to extract the neutron electric form factor from measurements of the neutron's recoil polarization in quasielastic 2 H(e, e')lH scattering is presented. The experiment described here employed the Thomas Jefferson National Accelerator Facility's longitudinally polarized electron beam, a magnetic spectrometer for detection of the scattered electron, and a neutron polarimeter designed specifically for this experiment. Measurements were conducted at three Q 2 values of 0.45, 1.13, and 1.45 (GeV/c) 2 , and the final results extracted from an analysis of the data acquired in this experiment are reported and compared with recent theoretical predictions for the nucleon form factors. Next, I would like to thank those who I credit most for my development: Jim Kelly and Andrei Semenov. At times, I found Jim's extremely high standards and desire for rigor to be exasperating, especially during the development of our simulation code and discussions of formalism (e.g., the "dreaded" Wigner rotation!), but, in retrospect, I am glad that I was constantly challenged to do something in an even better way and never permitted to give up. Indeed, I didn't fully appreciate the rigor of our analysis until our results were final, but hindsight is always 20/20. Also, I thank Jim for numerous comments and suggestions on this thesis; it is much better and much more complete because of his many suggestions. Andrei was the true guru (read: czar) of our analysis efforts, and he instilled in me the importance of careful work.I especially appreciate Andrei's timely responses to the numerous questions I always had concerning the analysis and the various analysis tools that we used; if there was someone who was sure to know the answer, that person was Andrei. Without Andrei, our analysis efforts would never have gotten off the ground. I also offer thank...

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Preconcentration and Electroanalysis of Copper Species at Electrochemically Activated Glassy Carbon Electrodes

Shiu¹,

Shi²

1998

Electroanalysis

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Electrochemically activated glassy carbon electrodes were applied to the preconcentration and electroanalysis of metal species. Activated glassy carbon electrodes were obtained by potentiostatic oxidation at +2.0 V in 0.5 M sulfuric acid. Copper species were readily extracted onto the modified electrode and were determined electrochemically. Voltammetric peak currents showed linear response for copper concentrations in the range between 1 to 20 μM with a large slope of 2.11 A M−1 and a correlation coefficient of 0.997. The reproducibility of the voltammetric measurements was found to be within 7 % RSD for five replicate measurements on copper concentration of 10 μM. The modified electrodes could be applied for repeated copper determinations without appreciable deterioration in electrode response. Results suggest that the preconcentration of copper species onto activated electrodes involved primarily cation‐exchange interactions with the surface graphite oxide film.

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Response to discussion of the paper by Barber et al. [J. Electroanal. Chem. 446 (1998) 125] in the Short Communication by J.-P. Diard et al. [J. Electroanal. Chem. 466 (1999) 122]

Cited by 136 publications

References 1 publication

Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy

Hydrogen adsorption and hydrogen evolution reaction on a polycrystalline Pt electrode studied by surface-enhanced infrared absorption spectroscopy

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Preconcentration and Electroanalysis of Copper Species at Electrochemically Activated Glassy Carbon Electrodes

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