Effect of electrolysis parameters on the morphologies of copper powder obtained in a rotating cylinder electrode cell

Decoupling and understanding the various mass, charge and heat transport phenomena involved in the electrocatalytic transformation of small molecules (i.e. CO2, CO, H2, N2, NH3, O2, CH4) is challenging but it can be readily achieved using dimensionless quantities (i.e. Reynolds, Sherwood, Schmidt, Damköhler, Nusselt, Prandtl, and Peclet Numbers) to simplify the characterization of systems with multiple interacting physical phenomena. Herein we report the development of a gastight rotating cylinder electrode cell with well-defined mass transport characteristics that can be applied to experimentally decouple mass transfer effects from intrinsic kinetics in electrocatalytic systems. The gastight rotating cylinder electrode cell enables the dimensionless analysis of electrocatalytic systems and should enable the rigorous research and development of electrocatalytic technologies.

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Mass transfer modeling and simulation at a rotating cylinder electrode (RCE) reactor under turbulent flow for copper recovery

Chemical Engineering Science ◽

10.1016/j.ces.2010.01.030 ◽

2010 ◽

Vol 65 (10) ◽

pp. 3042-3049 ◽

Cited By ~ 24

Author(s):

E.P. Rivero ◽

P. Granados ◽

F.F. Rivera ◽

M. Cruz ◽

I. González

Keyword(s):

Mass Transfer ◽

Turbulent Flow ◽

Modeling And Simulation ◽

Rotating Cylinder ◽

Copper Recovery ◽

Rotating Cylinder Electrode ◽

Mass Transfer Modeling

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Modeling and Simulation of a Rotating Cylinder Electrode Reactor for Metal Recovering

ECS Transactions ◽

10.1149/1.3268374 ◽

2019 ◽

Vol 20 (1) ◽

pp. 73-81 ◽

Cited By ~ 2

Author(s):

Paola Granados ◽

Fernando F. Rivera ◽

Ignacio Gonzalez ◽

Eligio P. Rivero

Keyword(s):

Modeling And Simulation ◽

Rotating Cylinder ◽

Rotating Cylinder Electrode

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The Effect of Surface Roughness on Diffusion and Chemical Reaction Controlled Limiting Currents on a Rotating Cylinder Electrode in Deaerated Solutions with and Without CO2

CORROSION ◽

10.5006/2552 ◽

2018 ◽

Vol 74 (9) ◽

pp. 971-983 ◽

Cited By ~ 4

Author(s):

M. Al-Khateeb ◽

R. Barker ◽

A. Neville ◽

H.M. Thompson

Keyword(s):

Mass Transfer ◽

Surface Roughness ◽

Sherwood Number ◽

Schmidt Number ◽

Rotating Cylinder ◽

Operating Conditions ◽

Limiting Current ◽

Surface Roughening ◽

Rotating Cylinder Electrode ◽

Effect Of Surface

The influence of surface roughness on mass transfer on a rotating cylinder electrode apparatus is investigated experimentally for a roughness pattern consisting of grooves parallel to the direction of fluid flow. Mass transfer from four different samples, with roughness values of 0.5 μm, 6 μm, 20 μm, and 34 μm, is measured using the limiting current technique for a range of rotational speeds in NaCl solutions saturated with N2 at pH = 3 and 4. Comparison with available correlations for the Sherwood number in literature (which are independent of surface roughness and are either for specific or arbitrary roughness patterns) shows that H+ mass transfer only correlates well for particular levels of roughness and that their accuracy can be increased if a correlation is utilized which is a function of surface roughening. A new correlation for Sherwood number as a function of the Reynolds number, Schmidt number, and surface roughness is proposed which agrees well with the mass transfer observed from all of the rough surface cases considered for this particular roughness pattern. Complementary experiments in CO2 environments were used to assess the combined limiting current associated with H+ and H2CO3 reduction (with the latter occurring via the buffering effect and being associated with the slow CO2 hydration step). Although the increase in sample roughness clearly leads to an increase in the rate of H+ mass transfer, in the CO2 environments considered, surface roughness is found to have no significant influence on the limiting current contribution from H2CO3, which can therefore be determined from Vetter’s equation across this range of operating conditions.

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