Experimental investigation of anodic gaseous concentration of a practical seal-less solid oxide fuel cell

Akihiko Momma, Yasuo Kaga, Kiyonami Takano, Ken Nozaki, Akira Negishi, Ken Kato, Tohru Kato, Toru Inagaki, Hiroyuki Yoshida, Koji Hoshino, Masaharu Yamada, Taner Akbay, Jun Akikusa

    Research output: Contribution to journalArticlepeer-review

    22 Citations (Scopus)

    Abstract

    In order to verify the validity of the simulation and to investigate the gaseous diffusion from the outlet of the anode, anodic gas concentration measurements of a seal-less disk-type solid oxide fuel cell (SOFC) were carried out using quadrupole mass spectrometer (QMS). Simultaneous gas sampling was conducted from the five sampling ports made at the anode separator. The uniformity of the radial gas flow in the anode was confirmed by analyzing the gas from four sampling ports located at a concentric circle. H2, H2O and N2 concentration profiles were measured and simulated under various fuel utilization (Uf) conditions and changing the gas flow rate. The diffusion of N2 into the anode was found to become less with increasing Uf owing to the lesser diffusivity of N2 in H2O than in H2. From the simulation, the existence of the reverse current, i.e., electrolysis current, in the outlet region was predicted. It was confirmed that the existence of the electrolysis current is possible by measuring the concentration of the gas in the anode under electrolysis operations. The comparison of V-i characteristics measured and simulated revealed that the effect of the concentration polarization is not significant and suggested the validity of the assumption made for the simulation.

    Original languageEnglish
    Pages (from-to)169-177
    Number of pages9
    JournalJournal of Power Sources
    Volume145
    Issue number2
    DOIs
    Publication statusPublished - Aug 18 2005

    All Science Journal Classification (ASJC) codes

    • Renewable Energy, Sustainability and the Environment
    • Energy Engineering and Power Technology
    • Physical and Theoretical Chemistry
    • Electrical and Electronic Engineering

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