Experimental investigation of the primary and secondary current distribution in a rotating cylinder Hull cell |
| |
Authors: | C Madore M Matlosz D Landolt |
| |
Affiliation: | (1) Laboratoire de Métallurgie Chimique, Département des Matériaux, Ecole Polytechnique Fédérale de Lausanne, MX-C Ecublens, CH-1015 Lausanne, Switzerland |
| |
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.List of symbols
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 ()
-
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
Greek symbols a
anodic Tafel constant (V)
- c
cathodic Tafel constant (V)
-
solution potential (V)
-
overpotential at the cathode surface (V)
-
density of copper (8.86 g cm–3)
-
electrolyte conductivity ( cm–1)
-
deposit thickness (cm)
- ave
average deposit thickness (cm)
-
surface normal (cm) |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|