Polarization and Overvoltage with Special Attention Given to Transfer Resistance

Ferguson, A. L.

doi:10.1149/1.3500245

Cited by 8 publications

(5 citation statements)

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“…If this is constant for a certain set of circumstances, the locus of i vs. V will be a straight line with intercept e and slope 1/r. This determination is called the direct method (5) of obtaining e and r. Another method which may be used to check or complement this is the interruption method. This consists in breaking the circuit and observing V before and after, as well as i before, the break.…”

Section: (Ii)mentioning

confidence: 99%

“…Once the "characteristics", i.e., the straight lines associated with the critical points, have been found, it is an easy matter, knowing equation (III), to give the main features of a transient corresponding to any values of E and R. 5 Under similar circumstances, the potential drop across the diffusion layer has been deduced to be negligible. See reference (9).…”

Section: Prediction Of General Features Of a Make Transient-mentioning

confidence: 99%

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Anodic Behavior of Copper in HCl

Stephenson

Bartlett

1954

J. Electrochem. Soc.

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Anodic behavior of copper in 2N HC1 has been studied by both electrical and optical methods The temporal behavior of current and voltage have been found, as well as the current vs. voltage characteristics. The anode surface has been observed both visually and photographically with the aid of conventional microscopes, and the anolyte has been photographed cinematographically using a sehlieren microscope.When the current is turned on, a layer, probably CuC1, starts to form at random nucleation spots on the anode. This grows until the whole anode is covered, at which time the current drops abruptly. Up until this time the anolyte becomes less concentrated, but the concentration may increase again after the current has become low.The anode-calomel voltage may be written as V = e(i) + it, where e(i) becomes constant at high current densities. The values of e(i) have been found by both the interruption and the direct method, and there appear to be at least four of physical significance These values are --0.35, --0.27, -0.05, and +0.11 v.In general, the current drops twice before reaching its minimum value. If t I is the time from the make to the first drop, and if Q = ]to1 i dt, and if io is the "initial" current after the make, then empirically Q = 24(io -0.70) -0 53, where io is in ma.The anode layer is about 3 ~ thick in the steady state. When the circuit is broken, r and e change rather rapidly (in about 0.1 sec), but the layer dissolves off slowly.

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Section: (Ii)mentioning

confidence: 99%

Section: Prediction Of General Features Of a Make Transient-mentioning

confidence: 99%

Anodic Behavior of Copper in HCl

Stephenson

Bartlett

1954

J. Electrochem. Soc.

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“…This phenomenon is clearly evident on the oscillogram. This technique has been reviewed and furthered by Ferguson (50). Silverman and Remick (J)9) made oscillographic studies for the purpose of exploring the potentialities of this technique as a tool for reaction mechanism studies.…”

Section: Alternating-current Techniquesmentioning

confidence: 99%

Electrochemical methods available for reaction mechanism studies

Remick¹

1956

J. Chem. Educ.

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“…This method is simpler, and, 573 according to authoritative views (8,10), is as accurate and reliable as the "indirect" method, if applied correctly.…”

Section: Experimental Procedures and Materials Usedmentioning

confidence: 99%

Effect of Fluorides and Other Addition Agents on the Cathodic Potential of Titanium in Hydrofluoric Acid

Straumanis

Shih

Schlechten

1955

J. Electrochem. Soc.

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The absolute hydrogen overvoltage values of titanium in hydrofluoric acid increase, or the cathodic potentials, vii, decrease (become more negative) with addition of alkali fluorides to the acid. The vH decreases with increasing concentration of the salt in the sequence NH4F --~ KF ~ NaF, which is also the sequence of decreasing cationic radius. For example, at 50 ma/cm ~ ~H decreases from -0.8 v in pure 0.1N hydrofluoric acid to -1.68 v in the same acid if it is 1M with respect to sodium fluoride. If the titanium cathode dissolves in the acid, the wi-current density relationship is linear; if the dissolution ceases (at higher concentrations of the added fluoride), Tafel's relationship is fulfilled. In between there is a mixed straight line and quasi logarithmic relationship, the latter occurring at higher current densities. Organic colloid solutions of agar-agar or arabic gum appreciably decrease vii; methylene blue solutions increase it slightly.

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Polarization and Overvoltage with Special Attention Given to Transfer Resistance

Cited by 8 publications

References 0 publications

Anodic Behavior of Copper in HCl

Anodic Behavior of Copper in HCl

Electrochemical methods available for reaction mechanism studies

Effect of Fluorides and Other Addition Agents on the Cathodic Potential of Titanium in Hydrofluoric Acid

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