Hydrogen-oxygen generation with intermediate temperature steam electrolysis using lagao 3 based perovskite electrolyte for recovery of unused heat energy

Tatsumi Ishihara, Shotaro Matsushita

    研究成果: ジャーナルへの寄稿学術誌査読

    2 被引用数 (Scopus)

    抄録

    Application of LaGaO 3 based electrolyte for steam electrolysis at intermediate temperature was studied for the generation of hydrogen and oxygen by using the unused heat energy from steelmaking process. It was found that H 2 formation rate was much improved by combination of oxygen ion conducting oxide with NiFe (9:1) bimetallic alloy. In particular, combination with La 0.6Sr 0.4Fe 0.9Mn 0.1O 3 (LSFM) or Ce 0.8Sm 0.2O 2 (SDC) is highly effective for increasing current density. Impedance plots for cathode were consisted of two semicircles, which could be assigned to a diffusion and an activation overpotential in low and high frequency region, respectively. Comparing with NiFe, mixing with SDC is much effective for decreasing the diffusion overpotential. This might be assigned to increase in three phase boundary and porosity of cathode. Effects of steam partial pressure was further studied and because of slow diffusivity of water in porous cathode, increase in humidity pressure decreased H 2 formation rate. Humidity utilization of 56% was achieved by using 81 ml/min (29% PH 2O) steam flow rate.

    本文言語英語
    ページ(範囲)1384-1388
    ページ数5
    ジャーナルisij international
    52
    8
    DOI
    出版ステータス出版済み - 2012

    !!!All Science Journal Classification (ASJC) codes

    • 材料力学
    • 機械工学
    • 金属および合金
    • 材料化学

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