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Evaluation of the cell voltage of electrolytic HI concentration for thermochemical water-splitting iodine-sulfur process

熱化学法ISプロセスにおけるHI電解濃縮セルの電圧評価

田中 伸幸 ; 吉田 光徳; 奥田 泰之; 佐藤 博之  ; 久保 真治  ; 小貫 薫

Tanaka, Nobuyuki; Yoshida, Mitsunori; Okuda, Hiroyuki; Sato, Hiroyuki; Kubo, Shinji; Onuki, Kaoru

熱化学水素製造法ISプロセスの効率化に関する電解電気透析法(EED)を用いたHIx溶液(HI-H$$_{2}$$O-I$$_{2}$$混合液)濃縮研究の一環として、EEDの最適操作条件検討及びセル構造の最適設計に役立てるため、EEDセル電圧の内訳にかかわる予備的検討を行った。セル電圧検討の基礎データである溶液の電気抵抗,黒鉛電極におけるヨウ素-ヨウ化物イオンの酸化還元反応の過電圧、及び膜にかかわる電圧降下について、プロセス条件に近い組成を有するHIx溶液を用いた場合の値を測定した。また、セル電圧の推算方法を検討し、取得した基礎データをもとに試算した結果、実測値と良好な一致が認められ、用いた方法の妥当性を確認した。

Breakdown of the cell voltage in the electro-electrodialysis process for concentrating HIx solution (HI-H$$_{2}$$O-I$$_{2}$$ mixture) was preliminarily examined in an effort to clarify the optimal operation condition as well as to optimize the cell design for the application to the thermochemical water-splitting IS process for large-scale hydrogen production. Basic data such as electric resistance of HIx solution, overvoltage of the iodine-iodide ion redox reaction at graphite electrode, and the membrane voltage drop, were measured using HIx solution with composition of interest. Also, a methodology for estimating the cell voltage was discussed. The calculated cell voltage agreed well with the experimental one indicating the validity of the procedure adopted.

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