Effect of the potential traverse rate on the potentiokinetic polarization curves of Ni in 1 N H2SO4

Ijzermans, A. B.

doi:10.1016/s0010-938x(70)80074-9

Cited by 15 publications

(4 citation statements)

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“…(i) an active dissolution region near zero current potential which will be called the dissolution region (I) for simplification, (ii) second active dissolution region (II), which shows a plateau, at the potentials between the dissolution region (I) and passive region, (iii) a passive region, and (iv) a transpassive dissolution region (III) above 1.20 VSHE. These polarization curves are essentially the same as those of bulk Ni mea- sured in sulphuric acid solutions [11,12], indicating that the electrochemical behaviour of deposited Ni can be dealt as bulk Ni.…”

Section: Dissolution Of Ni In Acidic Solutionsupporting

confidence: 55%

Application of electrochemical quartz crystal microbalance technique to investigation of the interfacial reactions at metal electrode/electrolyte

Lee

Pyun

2000

Metals and Materials

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This paper critically evaluates the electrogravimetric curves measured on the thin metal (Fe, Ni, A1 and Cu) film electrode/aqueous electrolyte system at our laboratory and elsewhere, to introduce how to apply the principle of electrochemical quartz crystal microbalance technique to the study of such interfacial reactions at electrode/electrolyte as corrosion, passivation and deposition of metals. From the electrogravimetric curve measured on various thin metal film electrode specimens simultaneously with steady state voltammogram, quasi-steady state or transient voltammogram, the interfacial reaction mechanisms of the metals have been proposed.

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Section: Dissolution Of Ni In Acidic Solutionsupporting

confidence: 55%

Application of electrochemical quartz crystal microbalance technique to investigation of the interfacial reactions at metal electrode/electrolyte

Lee

Pyun

2000

Metals and Materials

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“…The voltammograms associated with the dissolution, prepassivation, and passivation of nickel in sulfuric acid exhibit at least two current peaks (I and II) located at potentials more positive than the equilibrium potential calculated for the NiO electrode (3,14,15,(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29). tion composition including pH (27,(30)(31)(32), with the potential perturbation applied to the specimen (15,21,33), with the electrode history including the degree of surface electroreduction achieved in previous treatments (34), and with the hydrodynamic conditions (14,27), although the general shape of the voltammograms remains'in principle the same at least for an oxide-free Ni(ll0) electrode (35,36), Under potentiostatic conditions, only peak I can be observed (36) and this result can be related to a local increase in pH which compensates the growth of the second current peak through the enhancement of the chemical dissolution of the surface layer. tion composition including pH (27,(30)(31)(32), with the potential perturbation applied to the specimen (15,21,33), with the electrode history including the degree of surface electroreduction achieved in previous treatments (34), and with the hydrodynamic conditions (14,27), although the general shape of the voltammograms remains'in principle the same at least for an oxide-free Ni(ll0) electrode …”

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confidence: 91%

“…The electrochemical studies on the active-passive transition of nickel in acid were also performed by applying nonstationary and impedance techniques (3,(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29). The voltammograms associated with the dissolution, prepassivation, and passivation of nickel in sulfuric acid exhibit at least two current peaks (I and II) located at potentials more positive than the equilibrium potential calculated for the NiO electrode (3,14,15,(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29).…”

mentioning

confidence: 99%

“…The relative contribution of those peaks changes according to the solu-* Electrochemical Society Active Member. tion composition including pH (27,(30)(31)(32), with the potential perturbation applied to the specimen (15,21,33), with the electrode history including the degree of surface electroreduction achieved in previous treatments (34), and with the hydrodynamic conditions (14,27), although the general shape of the voltammograms remains'in principle the same at least for an oxide-free Ni(ll0) electrode (35,36), Under potentiostatic conditions, only peak I can be observed (36) and this result can be related to a local increase in pH which compensates the growth of the second current peak through the enhancement of the chemical dissolution of the surface layer.…”

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confidence: 99%

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Comparative Potentiodynamic Study of Nickel in Still and Stirred Sulfuric Acid‐Potassium Sulfate Solutions in the 0.4–5.7 pH Range

Barbosa

Real

Vilche

et al. 1988

J. Electrochem. Soc.

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Figure 10 shows the coulombic efficiency of Li/LiC104/ PPy batteries at various current densities. Each cell was charged to a 21% of doping level. Since the capacity of BF4--formed PPy is very low compared to the others, even the doping level of 21% is overloaded for this cathode. In fact, for even shallow charges, an extraordinary high cell voltage (over 4.5V) was observed, indicating that the PPy film is subject to oxidative decomposition. For this reason, the results for Li/LiCIO4/PPy formed with BF( are not shown. The battery assembled with the PPy cathode formed with PF6-keeps 100% of eouiombic efficiency up to the current density of 2.5 mAcm -2. From a high current density criteria better battery performance is also displayed in the order of PFC-, CF3803 -, CiO4 -formed PPy cathodes. In conclusion, the battery behavior of Li/LiCiO4/ pPy cell is consistent with the size and nucleophilicity of the polymerization anion. ABSTRACTThe potentiodynamic behavior of polycrystalline nickel disk electrodes in the potential range of the active to passive transition was investigated in still and stirred sulfuric acid solutions containing potassium sulfate in the 0.4 ~< pH ~< 5.7 range. Voltammetric data derived with a nickel rotating disk electrode allow a distinction between the main competing processes associated with the active to passive transition of nickel in acid, through their different dependences on the potential sweep rate and on the rotation speed. The first process corresponds to the formation of a nickel hydroxide solid phase through a relatively simple mechanism initially involving adsorbed (OH) species. The second process comprises the chemical dissolution and precipitation of nickel hydroxide, producing the thickening of the anodic layer. At high positive potentials, this anodic layer progressively transforms into the NiO passive layer. The overall reaction is discussed in terms of a complex reaction pathway in which the participation of water plays a fundamental role. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 169.230.243.252 Downloaded on 2014-11-27 to IP J. Electrochem. Soc.: ELECTROCHEMICAL SCIENCE AND TECHNOLOGY May 1988 ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 169.230.243.252 Downloaded on 2014-11-27 to IP

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Electrochemical behaviour of nickel anode in H₂SO₄ solutions and the effect of halide ions

Rehim

Wahaab

Maguid

1986

Materials & Corrosion

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The electrochemical behaviour of pure nickel in H,S04 solutions has been potentiodynamically investigated. The effects of the following factors on the anodic dissolution and passivation of the metal are discussed: potential scan rate, successive cyclic voltammetry and progressive additions of Cl-, Br-and I-ions. Increasing the potential scan rate increases the critical current density i, , denoting that the active dissolution of nickel in H2S04 is a diffusion controlled process. Cyclic voltammetry shows that the reverse excursion does not restore the anode to its active state. On successive cycling, the height of i,, decreases; this could be attributed to the decrease in the reduction efficiency of passivating oxide film during the cathodic half cycles.The presence of the halogen ions below a certain concentration specific to each anion inhibits the anodic dissolution both in the active and passive states. The inhibitive action of these additives decreases in the order I-, Br-, C1-. Beyond the specific concentrations, the halogen ions accelerate the anodic dissolution and shift the active passive transition to more positive values. The aggressiveness of these anions decreases in the sequence Cl-, Br-, I-. Further increase in the halogen ion concentrations can lead to breakdown of the passive film and initiate pitting. The susceptibility of nickel to pitting attack enhances with increasing H2S04 concentration.Das elektrochemische Verhalten von reinem Nickcl in Schwefelsame wurde potentiodynamisch untersucht. In diesem Zusammenhang werden die Einfliisse der folgenden Fdktoren auf die anodische Auflosung und Passivierung des Metalls erortert: Potentialvorschubgeschwindigkeit, zyklische Voltarnmetrie und steigende Zusatzmengen von Chlorid, Bromid und Jodid. Erhohen der Potentialvorschubgeschwindigkeit erhoht die kritische Stromdichte L, was ein Indiz dafiir ist, dab die aktive Auflosung von Nickel in Schwefelsaure diffusionskontrolliert ist. Die Ergebnisse der zyklischen Voltammetrie zeigen, daO beim Durchlauf in Gegenrichtung die Anode nicht wieder aktiviert wird. Bei mehrfachem Durchlaufen des Zyklus nimmt die kritische Stromdichte ab; dieser Effekt konnte der Abnahme des Reduktionswirkungsgrades fur den passivierenden Oxidfilm wahrend der kathodischen Halbzyklen zugeschrieben werden.Halogenionen unterhalb einer bestimmten Konzentration (die fur jedes Anion spezifisch ist) hemmcn die anodischc Auflosung sowohl im Aktiv-als auch im Passivbereich. Die hemmende Wirkung dieser Zusatze nimmt in der Reihe Jodid -Bromid -Chlorid ab. Oberhalb dieser spezifischen Konzentrationen wirken Halogenionen beschleunigend auf die anodische Auflosung und verschieben den AktivlPassiv-Ubergang in Richtung von positiven Werten. Die Aggressivitat dieser Anionen nimmt in der Reihenfolge Chlorid -Bromid -Jodid ab.Weiteres Erhohen der Halogenionenkonzentration kann zum Durchbruch der Passivschicht fiihren und Lochkorrosion ausloscn. Die Anfalligkeit von Nickel fur Lochkorrosion nimmt mit der Schwefelsaurekonzentration zu.

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Effect of the potential traverse rate on the potentiokinetic polarization curves of Ni in 1 N H2SO4

Cited by 15 publications

References 12 publications

Application of electrochemical quartz crystal microbalance technique to investigation of the interfacial reactions at metal electrode/electrolyte

Application of electrochemical quartz crystal microbalance technique to investigation of the interfacial reactions at metal electrode/electrolyte

Comparative Potentiodynamic Study of Nickel in Still and Stirred Sulfuric Acid‐Potassium Sulfate Solutions in the 0.4–5.7 pH Range

Electrochemical behaviour of nickel anode in H₂SO₄ solutions and the effect of halide ions

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Effect of the potential traverse rate on the potentiokinetic polarization curves of Ni in 1 N H2SO4

Cited by 15 publications

References 12 publications

Application of electrochemical quartz crystal microbalance technique to investigation of the interfacial reactions at metal electrode/electrolyte

Application of electrochemical quartz crystal microbalance technique to investigation of the interfacial reactions at metal electrode/electrolyte

Comparative Potentiodynamic Study of Nickel in Still and Stirred Sulfuric Acid‐Potassium Sulfate Solutions in the 0.4–5.7 pH Range

Electrochemical behaviour of nickel anode in H2SO4 solutions and the effect of halide ions

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Electrochemical behaviour of nickel anode in H₂SO₄ solutions and the effect of halide ions