プロトン導電性固体電解質を用いた電量滴定による水素分析装置

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タイトル別名
  • Hydrogen Analyzer Based on Coulometric Titration Using Proton Conductive Solid Electrolyte
  • プロトン ドウデンセイ コタイ デンカイシツ オ モチイタ デンリョウ テキテ

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Employing the same method of Otsuka’s oxygen analyzer (Trans. JIM, 25 (1984) 639), we developed a new type hydrogen analyzer based on coulometric titration using a proton conductive solid electrolyte. The following electrochemical cell was constructed by utilizing indium doped calcium zirconate as the electrolyte and utilizing sintered porous platinum as the electrodes.<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentThe cell was operated at 973 K. The left electrode chamber was exposed to the flowing Ar+1%H2 gas, while the right electrode chamber was closed and Ar gas was circulated. On imposing the positive constant voltage to the cell, the right electrode worked non-reversible and the hydrogen potential of the right electrode chamber was decreased to the very small value specified by the Hebb-Wagner’s polarization condition state. In the polarization state, the hydrogen to be analyzed was injected to the right electrode chamber by a micro-syringe and the excess current due to proton transport from the right to the left electrode was measured in the external circuit. The quantity of electricity calculated by the integration of the decay curve of the excess current was in good agreement with theoretical value evaluated from the amount of injected hydrogen by Faraday’s law. The hydrogen in a commercial palladium plate was analyzed successfully by dropping the specimens in the combustion furnace locate in the circulating path of the right electrode chamber. The performance and the best analyzing condition were discussed theoretically in terms of the electrochemical properties of the electrolyte. This type of hydrogen analyzer doesn’t need a standard sample and any calibration for the blank conditions and has high ability to detect a small amount of hydrogen as little as 10−8 mol(H).

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 58 (7), 782-788, 1994

    公益社団法人 日本金属学会

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