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Experimental investigation of the primary and secondary current distribution in a rotating cylinder Hull cell

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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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