Abstract
A rotating cylinder cell having a nonuniform current distribution similar to the traditional Hull cell is presented. The rotating cylinder Hull (RCH) cell consists of an inner cylinder electrode coaxial with a stationary outer insulating tube. Due to its well-defined, uniform mass-transfer distribution, whose magnitude can be easily varied, this cell can be used to study processes involving current distribution and mass-transfer effects simultaneously. Primary and secondary current distributions along the rotating electrode have been calculated and experimentally verified by depositing copper.
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Abbreviations
- c :
-
distance between the cathode and the insulating tube (cm)
- F :
-
Faraday's constant (96 484.6 C mol−1)
- h :
-
cathode length (cm)
- i :
-
local current density (A cm−2)
- i L :
-
limiting current density (A cm−2)
- i ave :
-
average current density along the cathode (A cm−2)
- i 0 :
-
exchange current density (A cm−2)
- I :
-
total current (A)
- M :
-
atomic weight of copper (63.54 g mol−1)
- n :
-
valence
- r p :
-
polarization resistance (Ω)
- t :
-
deposition time (s)
- V c :
-
cathode potential (V)
- Wa T :
-
Wagner number for a Tafel kinetic approximation
- x/h :
-
dimensionless distance along the cathode surface
- z :
-
atomic number
- βa :
-
anodic Tafel constant (V)
- βc :
-
cathodic Tafel constant (V)
- Φ:
-
solution potential (V)
- η:
-
overpotential at the cathode surface (V)
- ρ:
-
density of copper (8.86 g cm−3)
- κ:
-
electrolyte conductivity (Ω cm−1)
- μ:
-
deposit thickness (cm)
- γave :
-
average deposit thickness (cm)
- ζ:
-
surface normal (cm)
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Madore, C., Matlosz, M. & Landolt, D. Experimental investigation of the primary and secondary current distribution in a rotating cylinder Hull cell. J Appl Electrochem 22, 1155–1160 (1992). https://doi.org/10.1007/BF01297417
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DOI: https://doi.org/10.1007/BF01297417