Mechanisms of mass transfer of dissolved gas from a gas-evolving electrode and their effect on mass transfer coefficient and concentration overpotential

Vogt, Helmut

doi:10.1007/bf01320646

Cited by 46 publications

(22 citation statements)

References 19 publications

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“…The other one is the transfer of the dissolved product to the gas-liquid interface causing bubble growth. This mass transfer rate can be assessed [2]. The present study focuses on mass transfer from the bulk to the electrode.…”

Section: Introductionmentioning

confidence: 99%

Local microprocesses at gas-evolving electrodes and their influence on mass transfer

Vogt

Stephan

2015

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Local microprocesses at gas-evolving electrodes and their influence on mass transfer

Vogt

Stephan

2015

Electrochimica Acta

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“…This complicates practical handling, but the shortcoming can be remedied. A useful approximation with a deviation of less than 4 % is Equation (15).…”

Section: Discussionmentioning

confidence: 99%

“…The rate

{true \dot{N}}_{P, w}

generated at the electrode differs from the rate arriving in bulk. The mean value

{true \dot{N}}_{P}

representative of mass transfer on the active area:

{true \overset{N}{true}}_{P} = k_{a P} A true(1 - Θ true) {(c_{\infty} - c_{w})}_{P}

can be estimated from:

{true \dot{N}}_{P} = {true \dot{N}}_{P, w} true(1 - \frac{2}{3} f_{G} true)

…”

Section: The Product Appears In Dissolved Formmentioning

confidence: 99%

Single‐phase free convective mass transfer in electrochemical reactors

Vogt

2015

Can J Chem Eng

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At small values of current density and in the absence of significant forced convection, the simultaneous mass transfer of reagent and of product is controlled by free convection. A practical mass transfer equation is derived applicable to laminar as well as to turbulent flow. The function considers the particular conditions of electrodes with and without gas evolution and differs in application to reagent and to product. In addition to the more accurate and complex equation, a simpler relationship suitable for rough estimates is suggested.

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“…Three main areas have been investigated such as: the bubble formation (Chirkov & Psenichnikov, 1986), the mass transfer and hydrodynamic instabilities at gas-evolving surfaces (Kreysa & Kuhn, 1985), and the behavior of gas in porous electrodes in fuel cells (White & Twardoch, 1988). Many works were developed up to the present about gas-evolving electrodes (St-Pierre & Wragg, 1993a, 1993bVogt, 1979Vogt, , 1984aVogt, , 1984bVogt, , 1984cVogt, , 1989aVogt, , 1989bVogt, , 1992Vogt, , 1994Vogt, , 1997Czarnetzki & Janssen, 1989;Boissonneau & Byrne, 2000;Ellis et al, 1992;Janssen et al 1984;Lastochkin & Favelukis, 1998;Wongsuchoto et al, 2002;Buwa & Ranade, 2002;Gabrielli et al, 2002;Correia & Machado, 1998;Lasia, 1998;Iwasaki et al, 1998;Fahidy & Abdo, 1982;Lasia, 1998Lasia, , 1997Barber et al, 1998;Eigeldinger & Vogt, 2000;Solheim et al, 1989;Elsner & Coeuret, 1985;Dykstra et al, 1989;Khun & Kreysa, 1989;Lubetkin, 1989;Martin & Wragg, 1989;Lantelme & Alexopoulos, 1989;Gijsbers & Janssen, 1989;Chen, 2001;…”

Section: Introductionmentioning

confidence: 99%