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  • Articles  (6)
  • nickel  (6)
  • 2000-2004  (6)
  • 1955-1959
  • Electrical Engineering, Measurement and Control Technology  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Normal and anomalous codeposition of Zn–Ni alloys from chloride bath (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 173-179 
    Details
    ISSN: 1572-8838
    Keywords: alloys ; electrodeposition ; nickel ; zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The codeposition of Zn–Ni alloys from chloride bath has been studied by means of potentiostatic electrodeposition in the potential range −700 to −1100 mV vs Ag/AgCl, where both normal and anomalous codeposition occurs. Deposition of alloys of different composition, morphology and structure, depending on the cathodic potential, was found. Analysis of the partial current densities showed that the production of nickel rich alloys in the potential range −700 to −900 mV is due to the underpotential reduction of zinc, driven by nickel ion discharge. Morphological and microstructural analyses showed that these alloys have the face-centred-cubic structure of nickel (α phase) and that the addition of zinc in the nickel lattice causes internal stresses in the deposits, which are prevalently amorphous. At potentials more negative than −910 mV, corresponding to the equilibrium potential of the zinc rich γ phase deposition, the rate of deposition of the α phase decreases and the further increase in deposit zinc content leads to the formation of the γ phase, with a decrease in internal stress. In this range of potential, zinc and nickel reduction can occur separately, according to their respective exchange current densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003820423207
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  • 2
    Electronic Resource
    Electronic Resource
    Durability and thermal cycling of Ni/YSZ cermet anodes for solid oxide fuel cells (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 247-257 
    Details
    ISSN: 1572-8838
    Keywords: cermet ; durability ; nickel ; solid oxide fuel cell ; thermal cycling ; yttria stabilized zirconia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The long-term properties of Ni/yttria stabilized zirconia (YSZ) cermet anodes for solid oxide fuel cells were evaluated experimentally. A total of 13 anodes of three types based on two commercial NiO powders were examined. The durability was evaluated at temperatures of 850 ∘C, 1000 ∘C and 1050 ∘C over 1300 to 2000 h at an anodic d.c. load of 300 mA cm−2 in hydrogen with 1 to 3% water. The anode-related polarization resistance, R P, was measured by impedance spectroscopy and found to be in the range of 0.05 to 0.7 Ω  cm2. After an initial stabilization period of up to 300 h, R P varied linearly with time within the experimental uncertainty. At 1050 ∘C no degradation was observed. At 1000 ∘C a degradation rate of 10 mΩ cm2 per 1000 h was found. The degradation rate was possibly higher at 850 ∘C. A single anode was exposed to nine thermal cycles from 1000 to below 100 ∘C at 100 ∘C h−1. An increase in R P of about 30 mΩ cm2 was observed over the first two cycles. For the following thermal cycles R P was stable within the experimental uncertainty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003991529552
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  • 3
    Electronic Resource
    Electronic Resource
    Anodic polarization behaviour of cast iron alloys in deaerated concentrated H3PO4 solutions containing Cl− and F− ions (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 339-345 
    Details
    ISSN: 1572-8838
    Keywords: anodic behaviour ; cast iron alloys ; chloride ion ; chromium ; fluoride ion ; nickel ; phosphoric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The anodic behaviour of four cast iron alloys containing up to 16.7% Ni, in deaerated 60 wt% H3PO4 with and without 5 × 10−3 M F−, Cl− ions and 1:1 Cl−/F− mixture was studied by the potentiostatic technique. Values of E corr of the alloys are markedly influenced by their composition. The anodic behaviour in the active region is controlled by Fe in the alloys and the dissolution reaction is characterized by Tafel slopes, b a, between 64 and 88 mV (decade)−1. A two-electron transfer mechanism for the anodic dissolution is proposed. Passivation of the alloys is due to the formation of oxide layers including Fe2O3 and/or Fe3O4. Both critical and passive c.d. (I cc and I P) are markedly increased in the presence of Cl− ions, but the presence of F− ions inhibit the active dissolution of the alloys. The Tafel slope for oxygen evolution reaction (o.e.r.) in the transpassive region, $$b_{{\text{O}}_{\text{2}} } $$ is 240 ± 25 mV. In the proposed mechanism for the o.e.r., the rate determining step is an electron transfer reaction and possible interpretation of the high Tafel slopes is given based on the dual barrier model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003903806668
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  • 4
    Electronic Resource
    Electronic Resource
    Separation of nickel from cobalt using electrodialysis in the presence of EDTA (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 439-445 
    Details
    ISSN: 1572-8838
    Keywords: cobalt ; EDTA ; electrodialysis ; nickel ; separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Optimum conditions are determined for the removal of nickel from cobalt solutions by electrodialysis exploiting the greater stability of the EDTA complex with nickel. The Ni–(EDTA)2− complex and hydrated Co2+ ions are transferred from the feed solution to the electrodialysis anolyte and catholyte chambers, respectively. A three compartment cell is required to prevent the transfer of hydrated Ni2+ from the anolyte chamber as the EDTA present is destroyed at the anode. Complete removal of nickel from cobalt can be achieved but there is a compromise between cobalt purity and the percentage of cobalt transferred to the catholyte chamber for recovery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003966132167
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  • 5
    Electronic Resource
    Electronic Resource
    Electrochemical hydrogen evolution on polypyrrole from alkaline solutions (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 939-944 
    Details
    ISSN: 1572-8838
    Keywords: conductive polymers ; hydrogen ; iron ; nickel ; polypyrrole ; porous electrodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Thin films of conductive polypyrrole (PPy) were formed electrochemically from aqueous sulfuric acid. The films showed good electrocatalytic properties towards hydrogen evolution (h.e.r) from alkaline solutions on planar and packed-bed iron electrodes. Current–potential relations were measured at various temperatures and KOH concentrations on Fe, Ni and Fe/PPy planar electrodes. The current was found to be constant during 40 h of operation. SEM micrographs showed no difference in the morphology before and after this period. The activation energy for h.e.r. was found to be 50.2, 58.5 and 33.4 kJ mol−1 for Fe, Ni and Fe/PPy planar electrodes, respectively. The results showed that Fe/PPy can be used to produce hydrogen at both ambient and relatively high temperatures ∼70 ∘C. The polypyrrole coating on iron screens was found to reduce the potential required to sustain a specific rate of hydrogen generation and, hence, the energy consumed during the process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003946512641
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  • 6
    Electronic Resource
    Electronic Resource
    An interpretation of the Zech–Podlaha–Landolt model of metal codeposition via queuing theory (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 1169-1172 
    Details
    ISSN: 1572-8838
    Keywords: deposition ; electrolysis ; iron ; nickel ; queuing theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The electrode kinetics of anomalous codeposition of iron group metals is interpreted by queuing theory applied to the recently proposed Zech–Podlaha–Landolt model which postulates an adsorbed mixed–metal species existing temporarily as an electrochemically activated complex. The complex acts as an intermediate in a consecutive reaction leading to enhanced deposition of the more electronegative metal. Numerical illustrations for the codeposition of iron and nickel, and cobalt and nickel from a sulphate electrolyte are provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004007618685
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