Observation of bubble layer formed on hydrogen and oxygen gas-evolving electrode in a magnetic field |
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| Authors: | Hisayoshi Matsushima Takami Iida Yasuhiro Fukunaka |
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| Institution: | (1) Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu 400-8511, Japan;(2) Graduate School of Energy Science, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan |
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| Abstract: | The evolution of hydrogen and oxygen gasses in a 0.36-M KOH electrolyte was observed in a magnetic field, and the void fraction
was calculated by a hydrodynamic model. Both gasses evolving on a platinum working electrode formed a bubble layer which increased
the ohmic resistance. In addition to natural convection, magnetohydrodynamic (MHD) convection in a magnetic field improved
the electrolytic conductivity by supplying a fresh solution (pumping effect) and removing gas bubbles. The MHD convection
reduced the void fraction of hydrogen gas more than that of oxygen, which can be explained by the poor wettability of the
oxygen evolving electrode. |
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