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Theoretical and experimental studies of current distribution in gas-evolving electrochemical reactors with parallel-plate electrodes

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Abstract

The current density distributions for a gas evolving electrochemical reactor with parallel-plate electrodes at different total currents were measured and calculated. The current density profiles were determined using a segmented electrode method. The numerically computed curves, according to a one-dimensional model, and the experimental measurements show good agreement. Furthermore, a comparison between several mathematical models is made.

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Abbreviations

A :

cross-sectional area (cm2)

b :

constant in the Tafel equation (V−1)

B :

constant defined by Equation 20

C :

constant defined by Equation 23 (Ω cm2 V−2)

D :

constant defined by Equation 24 (Ω)

e :

electrode thickness (cm)

E :

proportionality constant in Equation 27 (cm3 A−1 s−1)

F :

Faraday constant (A s mol−1)

G :

volumetric gas flow rate (cm3 s−1)

i :

current density (A cm−2)

i 0 :

exchange current density (A cm−2)

I :

total current (A)

L :

electrode length (cm)

N :

number of experimental values in Equation 18

N Mac :

MacMullin number

P :

gas pressure (atm)

Q :

volumetric liquid flow rate (cm3 s−1)

R :

gas constant (atm cm3 K−1 mol−1)

S :

interelectrode distance (cm)

S i :

i electrode-to-membrane gap (cm)

S D :

separator thickness (cm)

T :

temperature (K)

U 0 :

reversible cell voltage (V)

v :

velocity (cm s−1)

v 0 :

superficial flow velocity (cm s−1)

v s :

single bubble rise velocity (cm s−1)

v sw :

bubble swarm rise velocity (cm s−1)

V :

applied voltage to the reactor (V)

W :

electrode width (cm)

y :

axial coordinate (cm)

\(\bar \delta _r \) :

mean relative deviation

Δφi :

ohmic drop in the anode-to-cathode gap (V)

Δφm :

ohmic drop in the metal phase (V)

ε:

gas voidage

εm :

limiting gas voidage

η:

overvoltage (V)

v e :

charge number of the electrode reaction

θ0 :

electrolyte resistivity (Ω cm)

η:

resistivity (Ω cm)

σ:

slip ratio

a:

anodic

c:

cathodic

D:

separator

exp:

experimental

th:

theoretical

g:

gas phase

m:

metal phase

s:

solution phase

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Authors and Affiliations

  1. Programa de Electroquímica Aplicada e Ingeniería Electroquímica (PRELINE), Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829, 3000, Santa Fe, Argentina

    J. M. Bisang

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  1. J. M. Bisang
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Bisang, J.M. Theoretical and experimental studies of current distribution in gas-evolving electrochemical reactors with parallel-plate electrodes. J Appl Electrochem 21, 760–766 (1991). https://doi.org/10.1007/BF01402811

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  • DOI: https://doi.org/10.1007/BF01402811

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