Abstract
Experimental distributions of the solution potential in flow-through and flow-by porous electrodes of nickel foam operating in limiting current conditions are presented. These are in good agreement with the corresponding theoretical distributions. In the case of a flow-by configuration used in a two-compartment cell, the experiments confirm the validity of the models, presented in Part III, which take into account the presence of a separator (ceramic porous diaphragm or ion exchange membrane).
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Abbreviations
- a e :
-
specific surface area per unit volume of electrode
- C 0 :
-
entrance ferricyanide concentration (y=0)
- D :
-
molecular diffusion coefficient of ferricyanide
- E e :
-
cathode potential
- F :
-
Faraday number
- \(\bar k_d \) :
-
mean (and local) mass transfer coefficient
- L :
-
electrode thickness
- L s-L :
-
separator thickness
- m :
-
number of sheets of foam in a stack
- n :
-
number of terms in Fourier series
- Q :
-
volumetric flow-rate
- r s :
-
ohmic specific resistance of the separator
- ū:
-
mean flow velocity based on empty channel
- V :
-
constant potential
- X :
-
conversion
- x :
-
coordinate for the electrode thickness
- y :
-
coordinate for the electrode length
- y 0 :
-
length of the porous electrode
- z :
-
number of electrons in the electrochemical reaction
- α:
-
parameter\([ = zF\bar k_d a_e C_0 /\gamma _c ]\)
- β:
-
parameter\([ = \bar k_d a_e /\bar u]\)
- γ:
-
ionic electrolyte conductivity
- φ sc :
-
solution potential in the pores of the cathode
- φ M :
-
matrix potential (φ sc = constant)
- λ:
-
parameter [=nπ/y 0]
- ρ:
-
electrolyte density
- \(\bar \varepsilon \) :
-
mean porosity
- ν:
-
kinematic viscosity
- ΔE c :
-
potential drop in the porous cathode
- Δψ:
-
potential drop defined in Fig. 5
- c:
-
cathodic
- o:
-
electrolyte alone
- s:
-
separator
References
Société SORAPEC, 94129 Fontenay-sous-Bois (France).
S. Langlois and F. Coeuret,J. Applied Electrochem. 19 (1989) 43.
Idem, Ibid.,19 (1989) 51.
F. Leroux and F. Coeuret,Electrochim. Acta 30 (1985) 159.
M. A. Enriquez-Granados, D. Hutin and A. Storck,27 (1982) 303.
A. Tentorio and U. Casolo-Ginelli,J. Applied Electrochem. 8 (1978) 195.
D. A. Cox and R. E. W. Jansson,12 (1982) 205.
M. Matlosz and J. Newman,J. Electrochem. Soc. 133 (1986) 1850.
J. Wang,Electrochim. Acta 26 (1981) 1721.
S. Langlois and F. Coeuret,J. Applied Electrochem. 20 (1990) 740.
J. M. Marracino, F. Coeuret and S. Langlois,Electrochim. Acta 32 (1987) 1303.
H. Olive and G. Lacoste,25 (1980) 1303.
F. Leroux and F. Coeuret,28 (1983) 1857.
G. M. Brown and F. A. Posey,J. Electrochem. Soc. 128 (1981) 306.
R. E. Sioda,Electrochim. Acta 16 (1971) 1569.
D. N. Bennion and J. Newman,J. Applied Electrochem. 2 (1972) 113.
F. Coeuret,Electrochim. Acta 21 (1976) 203.
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Langlois, S., Coeuret, F. Flow-through and flow-by porous electrodes of nickel foam Part IV: experimental electrode potential distributions in the flow-through and in the flow-by configurations. J Appl Electrochem 20, 749–755 (1990). https://doi.org/10.1007/BF01094301
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DOI: https://doi.org/10.1007/BF01094301