Transfer of mass or heat to an electrode in the region of hydrogen evolution—II.

Roušar, I.; Kačin, J.; Lippert, E.; Šmirous, F.; Cezner, V.

doi:10.1016/0013-4686(75)90008-0

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…A number of numerical correlations have been created to describe these mass transfer processes using a combined mathematical and empirical approach. Collectively, however, these correlations are in relative agreement as described by Vogt et al , To describe the effects of bubble break-off where fluid immediately replaces the departing bubble, Sh 1 , we use the Roušar correlation, , and to describe the combined effects of bubble growth and wake flow, Sh 2, we use Vogt’s correlation for low electrode bubble coverage (Θ < 0.5) where Θ represents the fraction of the electrode area shielded by bubbles during a bubble’s residence time and thus not available for reactions. The ratio R a / R in eq represents the ratio of inactive electrode area below a nucleated bubble as it grows.…”

Section: Modeling Sectionmentioning

confidence: 75%

Nanomorphology-Enhanced Gas-Evolution Intensifies CO₂ Reduction Electrochemistry

Burdyny

Graham

Pang

et al. 2017

ACS Sustainable Chem. Eng.

159

141

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Nanostructured CO 2 reduction catalysts now achieve near-unity reaction selectivity at increasingly improved Tafel slopes and low overpotentials. With excellent surface reaction kinetics, these catalysts encounter CO 2 mass transport limitations at current densities ca. 20 mA cm −2 . We show here that − in addition to influencing reaction rates and local reactant concentration − the morphology of nanostructured electrodes enhances long-range CO 2 transport via their influence on gas-evolution. Sharper needle morphologies can nucleate and release bubbles as small as 20 μm, leading to a 4fold increase in the limiting current density compared to a nanoparticle-based catalyst alone. By extending this observation into a diffusion model that accounts for bubble-induced mass transport near the electrode's surface, diffusive transport can be directly linked to current densities and operating conditions, identifying efficient routes to >100 mA cm −2 production. We further extend this model to study the influence of mass transport on achieving simultaneously high selectivity and current density of C2 reduction products, identifying precise control of the local fluid environment as a crucial step necessary for producing C2 over C1 products.

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Section: Modeling Sectionmentioning

confidence: 75%

Nanomorphology-Enhanced Gas-Evolution Intensifies CO₂ Reduction Electrochemistry

Burdyny

Graham

Pang

et al. 2017

ACS Sustainable Chem. Eng.

159

141

View full text Add to dashboard Cite

show abstract

“…A volume element of the interelectrode space, located at the distance x from the bottom of the cell as shown in Figure 15, is considered. Its volume fraction of gas in electrolyte at the length x is defined by dVo,x ((Jx = wsdx' (76) Introducing an absolute gas velocity at x, VO,x = dx/ dt, the gas flow rate may be written Figure 15. Model of gas-evolving cell.…”

Section: B3 Current Distribution and Ohmic Resistancementioning

confidence: 99%

Gas-Evolving Electrodes

Vogt¹

1983

Comprehensive Treatise of Electrochemistry

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“…The thickness of the hydrodynamic film or the boundary layer along the electrode is reduced, and hence the heat transfer coefficient in the cell is increased by circulation of the electrolytic solution (14)(15)(16)(17)(18)(19)(20)(21)(22). MacMullin et al studied the enhancement of heat transfer in an electrolyzer, where hydrogen evolution took place at the cathode (17).…”

mentioning

confidence: 98%

Bubble Effects on the Solution IR Drop in a Vertical Electrolyzer Under Free and Forced Convection

Hine

Murakami

1980

J. Electrochem. Soc.

125

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Effects of electrolytic bubbles on the IR drop of caustic soda solution in a vertical cell of one meter height were studied under both free and forced convection. Three pairs of Luggin-Haber probes were positioned near the anode and the cathode to determine the solution IR drop during electrolysis. A sectioned electrode having 10 segments was employed to obtain the current distribution from the bottom to the top of cell. The superficial resistivity of the solution containing gas bubbles agreed well with the Bruggemann equation.The solution IR drop decreased significantly when adequate conditions or cell geometry for solution circulation were provided. The anode-to-cathode gap was found to be the most important parameter for reduction of the solution IR drop in a vertical cell.

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Transfer of mass or heat to an electrode in the region of hydrogen evolution—II.

Cited by 18 publications

References 3 publications

Nanomorphology-Enhanced Gas-Evolution Intensifies CO₂ Reduction Electrochemistry

Nanomorphology-Enhanced Gas-Evolution Intensifies CO₂ Reduction Electrochemistry

Gas-Evolving Electrodes

Bubble Effects on the Solution IR Drop in a Vertical Electrolyzer Under Free and Forced Convection

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Transfer of mass or heat to an electrode in the region of hydrogen evolution—II.

Cited by 18 publications

References 3 publications

Nanomorphology-Enhanced Gas-Evolution Intensifies CO2 Reduction Electrochemistry

Nanomorphology-Enhanced Gas-Evolution Intensifies CO2 Reduction Electrochemistry

Gas-Evolving Electrodes

Bubble Effects on the Solution IR Drop in a Vertical Electrolyzer Under Free and Forced Convection

Contact Info

Product

Resources

About

Nanomorphology-Enhanced Gas-Evolution Intensifies CO₂ Reduction Electrochemistry

Nanomorphology-Enhanced Gas-Evolution Intensifies CO₂ Reduction Electrochemistry