An Advanced Electrode Assembly for Electrochemical Measurements in Aqueous Solutions

Feller, H.G.; Osterwald, Jörg

doi:10.1149/1.2426046

Cited by 11 publications

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“…[9] must be used to obtain the relation between Vo and thickness, viz. Vo = D~ ( ~aA ) [10] where A is given by (e/kT). Dividing both sides of this equation into the formation potential, V, gives V/Vo ----~aAE [11] where E, the average electric field strength within the layer, is given by V/D.…”

Section: Discussionmentioning

confidence: 99%

“…The samples were then electropolished in a 2% hydrochloric acid, 98% saturated potassium iodide solution (9). After rinsing in distilled water and drying, the samples were mounted between Teflon washers in an electrode holder similar to that described by Feller and Osterwald (10). Each sample was then anodically oxidized to a potential of 100V using a constant current, and the oxide film thus formed was removed from the sample by dissolution in 0.1M sulfuric acid.…”

Section: Methodsmentioning

confidence: 99%

“…If the charge-transfer process remains rate-determining, the increased charge-transfer overpotential n' in the presence of additive will be given by n' = a -b b In i' =a+bln(-~ 0 ) [3] An expression relating the overpotential increment and the fractional surface coverage can then be obtained by subtracting Eq. [1] and [3] to give 0 = 1-exp (--An/b) [4] Equation [4], based on the simple blocking theory, has been used in the study of hydrogen overvoltage at solid electrodes (8,10) and values of 0 calculated in this way from overvoltage data have been found to agree satisfactorily with values obtained from doublelayer capacity measurements (10). If it can be as-…”

Section: Introductionmentioning

confidence: 99%

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A Study of the Anodic Oxidation of Bismuth

Smet¹,

Hopper²

1969

J. Electrochem. Soc.

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The galvanostatic oxidation of bismuth in sodium borate‐boric acid and sodium carbonate solutions has been studied over a potential range of 90V by analysis of openhyphen;circuit transients. An anodic layer which shows bright interference colors is found to grow on the metal surface. Experimental results indicate that the dependence of the oxidation current density, i, on the overpotential, V, is expressable in the form normali=i0expfalse(V/Vofalse) , where i 0 and Vo are parameters determined from the data analysis. The parameter Vo is found to vary linearly with the overpotential during galvanostatic oxidation, while the parameter i 0 depends on the applied current density. These results are related to a high field conduction model.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Study of the Anodic Oxidation of Bismuth

Smet¹,

Hopper²

1969

J. Electrochem. Soc.

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“…The tungsten working electrode is a cylindrical single crystal with a flat on one side for optical measurements. It is clamped between Teflon washers in an electrode holder (14) and exposes a vertical surface of area 1.23 cm~ to the electrolyte when mounted in the cell. When not in use, the electrode is stored with an oxide film on its surface, and this film is removed by dissolution in dilute sodium hydroxide just before the sample is inserted in the cell.…”

Section: Methodsmentioning

confidence: 99%

An Ellipsometric Study of Electrochromism in Tungsten Oxide

Ord

1982

J. Electrochem. Soc.

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A self‐nulling ellipsometer was used to follow the optical changes which occur when galvanostatic anodic oxidation of tungsten in 0.5M sulfuric acid is interrupted at 5V intervals by the application of cathodic transients which color the oxide film. The film undergoes two distinct optical changes during the cathodic cycle, the first due to the strain and anisotropy resulting from electrostriction, and the second due to the optical absorption associated with electrochromism. For color cycles of limited duration, application of an anodic current will bleach the film with little optical hysteresis and return it to its initial thickness and refractive index. Longer color cycles reach a point where further coloring is accompanied by film dissolution. The optical data fit a model in which coloring takes place by a progressive change in the entire film rather than by movement of an interface separating colored and bleached layers of a duplex film. The coloring process appears to have no clearly defined end point either in sulfuric acid or in acetic acid where the color cycle can be extended without film dissolution.

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“…Die zylindrische Elektrode bestand aus hochreinem Nickel (99,999%). Sie war in eine schon fruher(7) beschriebene Teflonhalterung eingespannt und hatte eine Oberflache von etwa 1 cm2 . Sie wurde vor jedem Versuch abgeschmirgelt und anschliefiend anodisch in 1 n Schwefelsaure fur 15 min rnit 7 mA/cm2 im transpassiven Gebiet abgeatzt.…”

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Passivität und Transpassivität von Nickel in flußsauren Elektrolyten

Osterwald

Trunk

1977

Materials & Corrosion

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Es wird über potentiostatische und galvanostatische Messungen an Nickel in flußsauren Elektrolyten berichtet. Die Elektrodenkennlinie unterscheidet sich deutlich von der in Schwefelsäure. Insgesamt werden vier Stromdichtemaxima beobachtet, wobei das letzte bei etwa 2,5 VH liegt. In der Umgebung der Ruhespannung und jeweils nach den drei letzten Maxima überzieht sich die Elektrode mit dunklen Deckschichten. Schwach punktförmiger Angriff wird nach dem zweiten Maximum beobachtet. Vor den drei ersten Maxima treten unter galvanostatischen Bedingungen positiv und negativ gedämpfte sinusförmige Oszillationen auf. Dieses Phänomen deutet darauf hin, daß ähnliche Mechanismen zur Ausbildung der maxima führen. Die Untersuchung zeigt, daß die Passivität des Nickels nicht allein auf einer Wechselwirkung zwischen Metall und Wasser beruht, sondern daß ein erheblicher Einfluß der Art des gelösten Anions vorhanden ist.

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An Advanced Electrode Assembly for Electrochemical Measurements in Aqueous Solutions

Abstract: not Available.

Cited by 11 publications

References 0 publications

A Study of the Anodic Oxidation of Bismuth

A Study of the Anodic Oxidation of Bismuth

An Ellipsometric Study of Electrochromism in Tungsten Oxide

Passivität und Transpassivität von Nickel in flußsauren Elektrolyten

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