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Modeling surface nanobubbles in water electrolysis

Sperre, Asbjørn Hopland
Master thesis
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http://hdl.handle.net/11250/2352015
Issue date
2015
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Abstract
In this project a steady state approach is used to study the stability of surface

nanobubbles in water electrolysis. A two dimensional domain is considered, where

an electrode of length 100 nm is partly covered by a bubble. The results indicates

that a single nanobubble which partially covers the electrode can be stable, as long as

the electrogeneration of hydrogen is suffcient to balance the dissolution of hydrogen

at near the cap of the bubble. The effect of the evaporation rate constant on the

stability of the bubble is investigated, and the results indicates that as evaporation

rate constant is increased from 0.01 m/s to a 100 m/s the needed production of

hydrogen for a given bubble to be stable decreases. For values outside this range

the needed production of hydrogen in converges to a constant value depending on

the geometry of the bubble.
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NTNU

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