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

Tatsumi Ishihara, Shotaro Matsushita

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)1384-1388
    Number of pages5
    Journalisij international
    Volume52
    Issue number8
    DOIs
    Publication statusPublished - 2012

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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