Alternative Ni-impregnated mixed ionic-electronic conducting anode for SOFC operation at high fuel utilization

Futamura, S. and Tachikawa, Y. and Matsuda, J. and Lyth, S. M. and Shiratori, Y. and Taniguchi, S. and Sasaki, K. (2017) Alternative Ni-impregnated mixed ionic-electronic conducting anode for SOFC operation at high fuel utilization. Journal of the Electrochemical Society, 164 (10). F3055-F3063. ISSN 0013-4651 (https://doi.org/10.1149/2.0071710jes)

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Abstract

Redox-stable anodes are developed for zirconia-based electrolyte-supported SOFCs in order to improve the durability against fuel supply interruption and for higher fuel utilization, as an alternative to the conventional Ni-YSZ cermet. GDC (Ce0.9Gd0.1O2) is utilized as a mixed ionic-electronic conductor (MIEC), and combined with LST (Sr0.9La0.1TiO3) as an electronic conductor. Ni catalyst nanoparticles are incorporated via impregnation. The electrochemical characteristics of SOFC single cells using these anode materials are investigated in humidified H2 at 800°C. The stability against redox cycling and under high fuel utilization is analyzed and discussed. Ni-impregnated anodes with dispersed Ni catalyst nanoparticles on conducting oxide LST-GDC backbones exhibit lower anode non-ohmic overvoltage, and improve I-V performance. These anodes also show better redox stability compared to conventional anodes because of the isolation of Ni catalysts, preventing their agglomeration. Moreover, the co-impregnation of Ni catalysts and GDC nanoparticles further improves electrochemical characteristics due to a decrease in anode ohmic (IR) loss and non-ohmic overvoltage. This anode shows comparable I-V performance to conventional anodes for typical humidified hydrogen fuels, and is a promising redox-stable alternative for application at high fuel utilization.

  • Item type:Article
    ID code:85391
    Dates:
    Date
    Event
    30 June 2017
    Published
    5 June 2017
    Accepted
    24 April 2017
    Submitted
    Notes:Funding Information: This work was supported by Japan Science and Technology Agency (JST) through its “Center of Innovation Science and Technology based Radical Innovation and Entrepreneurship Program (COI Program)". Publisher Copyright: © The Author(s) 2017. S. Futamura et al 2017 J. Electrochem. Soc. 164 F3055 DOI 10.1149/2.0071710jes
    Subjects:Science > Chemistry
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:04 May 2023 10:25
    Last modified:25 Apr 2024 01:33
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/85391
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