Flow-through electrodes

Wroblowa, H.

doi:10.1016/s0022-0728(73)80322-5

Cited by 18 publications

(4 citation statements)

References 19 publications

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“…Again using dimensionless quantities, x ----x/L, i(x) = i (x)/iL, and substituting in the above equation gives di(x)/dx ----8d2R(x)/dx 2 --dR(x)/d-x [4] where 0 is the dimensionless group Deff/Lu, and iL is the maximum current which can be obtained when the reactant is entirely consumed, i.e., iL ----nFuRb where u is superficial velocity. For convenience in presentation the bars will be dropped, and it is to be understood that the subsequent equations are in dimensionless form.…”

Section: Di(x) /Dx -= Nf[def~dfr (X) /Dx ~ --Udr (X) /Dx]mentioning

confidence: 99%

“…In dimensionless form this is 1 --i(x) --R(x) --odR(x)/dx [5] which, of course, can also be obtained by integration of Eq. [4]. Ohms law in dimensionless form is i(x) --(1/A)d~](x)/dx [6] where A _--iLLpeff/b is the maximum ohmic potential drop in multiples of b and is obtainable only when the limiting current is supported by reaction over an infinitesimally small element at x ----0.…”

Section: Di(x) /Dx -= Nf[def~dfr (X) /Dx ~ --Udr (X) /Dx]mentioning

confidence: 99%

“…Theoretical steadystate treatments of this system have been given by Perskaya and Zaidenman (1), Austin et aI. (2), Gurevich and Bagotsky (3), and.more recently Wroblowa et al (4,5). A primary assumption in these treatments is that the rate of forced mass flow of reactant through the porous system dominates over axial diffusion so that axial diffusion is not included in the treatments.…”

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confidence: 99%

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Steady‐State Polarization at Porous, Flow‐Through Electrodes with Small Pore Diameter: I . Reversible Kinetics

Ateya

Austin

1977

J. Electrochem. Soc.

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This paper considers the effect of mass transfer and ohmic limitations on the current‐polarization relations for porous flow‐through electrodes with fine pores, for reversible one‐electron transfer reactions. The model includes mass transfer by both axial forced convection and axial diffusion. A new analytical solution is presented which reduces to a previous solution when axial diffusion is negligible. The effects of axial diffusion and ohmic potential drop in the pore electrolyte on the current and concentration distributions inside the electrode are investigated. Experimental confirmation is presented for some of the predictions and a quantitative comparison between theory and experiment is presented. It is concluded that axial diffusion effects are negligible under many experimental conditions, e.g., normal diffusion coefficient, flow rate, electrode length, etc. The results demonstrate the validity of the one‐dimensional model presented here under these conditions.

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Section: Di(x) /Dx -= Nf[def~dfr (X) /Dx ~ --Udr (X) /Dx]mentioning

confidence: 99%

Section: Di(x) /Dx -= Nf[def~dfr (X) /Dx ~ --Udr (X) /Dx]mentioning

confidence: 99%

mentioning

confidence: 99%

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Steady‐State Polarization at Porous, Flow‐Through Electrodes with Small Pore Diameter: I . Reversible Kinetics

Ateya

Austin

1977

J. Electrochem. Soc.

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“…Wroblowa etal. (11,12) have also presented theoretical treatments of this system and experimental results using the IJI-reversible system (11). They recently (12) treated the effects of a preelectrode diffusional boundary layer and of axial diffusion on the limiting current and on concentration, current, and potential distributions under conditions of very low flow speeds, u r~ 10-5_10-3 cm/sec.…”

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confidence: 99%

Steady‐State Polarization at Porous, Flow‐Through Electrodes with Small Pore Diameter: II . Irreversible Kinetics for One‐Electron and Consecutive Two‐Electron Transfer Reactions

Ateya

Austin

1977

J. Electrochem. Soc.

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In this paper a model is proposed for the performance of a porous flowt‐hrough electrode working on a redox couple, for one‐dimensional systems with line pores. The model includes the combined effects of mass transfer by forced convection and axial diffusion, ohmic potential drop in the pore electrolyte, and activation polarization, on the over‐all current‐polarization relations. The cases of front and rear reactant supply are treated. The treatment is extended to the case of a consecutive two‐electron transfer reaction where the rate equation is rather complicated. Experimental results are presented to test several aspects of the model. The agreement between theory and experiment is generally good for moderate ohmic effects.

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