論文

査読有り
2003年12月15日

Water electrolysis under microgravity: Part 1. Experimental technique

Electrochimica Acta
  • H. Matsushima
  • ,
  • T. Nishida
  • ,
  • Y. Konishi
  • ,
  • Y. Fukunaka
  • ,
  • Y. Ito
  • ,
  • K. Kuribayashi

48
28
開始ページ
4119
終了ページ
4125
記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/S0013-4686(03)00579-6

Water electrolysis was conducted in both alkaline (25wt.% KOH, 2wt.% KOH) and acid (0.1N H2SO4) solutions for 8s under microgravity environment realized in a drop shaft. The gas bubble formation of hydrogen and oxygen on platinum electrodes was observed by CCD camera. In alkaline solutions, a bubble froth layer grew on the electrode surface. Hydrogen bubble size was smaller than that of oxygen. The current density at constant potential decreased continually with time. In spite of the growth of a bubble froth layer on the electrode, the electrolysis never stopped, apparently because fresh electrolyte is supplied to the electrode surface by microconvection induced by the gas bubble evolution. In acid solution, hydrogen gas bubbles frequently coalesced on the cathode surface, yielding a larger average bubble than that of oxygen. The current density did not vary at constant potentials from -0.4 to -0.8V versus reversible hydrogen electrode (RHE), because the effective electrode surface area was significantly reduced by the larger bubble size compared to alkaline electrolyte. The present experiments indicate that, especially in a microgravity environment, the bubble evolution behavior and the resultant current-potential curves are significantly influenced by the wettability of the electrode in contact with the electrolyte. © 2003 Elsevier Ltd. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/S0013-4686(03)00579-6
Scopus
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0242365743&origin=inward
Scopus Citedby
https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=0242365743&origin=inward

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