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2. Nanobubble Formation and Coverage during High Current Density Alkaline Water Electrolysis

Author

Hammons, Joshua A., Kang, ShinYoung, Ferron, Thomas J., Aydin, Fikret, Lin, Tiras Y., Seung, Kansas, Chow, Paul, Xiao, Yuming, and Davis, Jonathan T.

Abstract

Gas bubbles are a necessary byproduct of water electrolysis whereby hydrogen and oxygen are produced from water. These attached gases reduce the electrode’s active area, which necessitates a deep understanding of the bubble life cycle starting from nanobubbles. Synchronized with the electrochemistry, the time evolution of the surface nanobubble size and coverage is resolved using grazing incidence small-angle X-ray scattering (GISAXS) and correlated with optical microscopy and theoretical calculations to show that a significant portion of the surface is covered in nanobubbles after larger micron-sized bubbles are observed. These nanobubbles increase in number and decrease in size, toward 2 nm diameter, with the charge passed. The trend in size and number is consistent with an increase in supersaturation, which reduces the nascent bubble size. Altogether, this study suggests a significant portion of the surface contains nanobubbles and that strategies to reduce the dissolved hydrogen would be effective at reducing the nanobubble surface coverage.

Published
2024
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3. Cellular fluidics

Author

Dudukovic, Nikola A., Fong, Erika J., Gemeda, Hawi B., DeOtte, Joshua R., Cerón, Maira R., Moran, Bryan D., Davis, Jonathan T., Baker, Sarah E., and Duoss, Eric B.

Published
2021
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5. Comparative Techno-Economic and Life Cycle Analysis of Water Oxidation and Hydrogen Oxidation at the Anode in a CO2 Electrolysis to Ethylene System

Author

Li, Wenqin, primary, Feaster, Jeremy T., additional, Akhade, Sneha A., additional, Davis, Jonathan T., additional, Wong, Andrew A., additional, Beck, Victor A., additional, Varley, Joel B., additional, Hawks, Steven A., additional, Stadermann, Michael, additional, Hahn, Christopher, additional, Aines, Roger D., additional, Duoss, Eric B., additional, and Baker, Sarah E., additional

Published
2021
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12. Methods—Design Guidelines for Tubular Flow-through Electrodes for Use in Electroanalytical Studies of Redox Reaction Kinetics.

Author

Yukun Gong, Clemens, Auston L., Davis, Jonathan T., Orme, Christine, Dudukovic, Nikola A., Ivanovskaya, Anna N., and Akolkar, Rohan

Subjects
OXIDATION-reduction reaction, CHEMICAL kinetics, CURRENT distribution, DISTRIBUTION (Probability theory), ELECTRODES
Abstract

The tubular flow-through electrode (FTE) is a facile electroanalytical tool for investigating electrochemical reaction kinetics; however, its suitability for this purpose requires careful design and operation under conditions that guarantee uniform current distribution. In this perspective article, we provide a scaling analysis of the transport and reaction processes within a tubular FTE leading to quantitative guidelines for the FTE design and operation. Two dimensionless parameters (classical Wagner number WaI and modified Wagner number incorporating the effect of mass transport WaII) are utilized to compare the magnitudes of the ohmic, activation and transport resistances of the tubular FTE, and to quantify its current distribution uniformity. With the aid of analytical modeling of the current distribution, optimal ranges for these two dimensionless parameters are defined so as to ascertain uniform current distribution. Application of these guidelines to a graphite tubular FTE is shown to enable the precise determination of the charge-transfer kinetics of the ferri/ferrocyanide redox reaction. [ABSTRACT FROM AUTHOR]

Published
2021
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