Oxidation-induced degradation and performance fluctuation of solid oxide fuel cell Ni anodes under simulated high fuel utilization conditions

Kawasaki, Tatsuya and Matsuda, Junko and Tachikawa, Yuya and Lyth, Stephen Matthew and Shiratori, Yusuke and Taniguchi, Shunsuke and Sasaki, Kazunari (2019) Oxidation-induced degradation and performance fluctuation of solid oxide fuel cell Ni anodes under simulated high fuel utilization conditions. International Journal of Hydrogen Energy, 44 (18). pp. 9386-9399. ISSN 0360-3199 (https://doi.org/10.1016/j.ijhydene.2019.02.136)

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Abstract

High fuel utilization (Uf) conditions in a small-scale electrolyte-supported solid oxide fuel cell (SOFC) with an Ni-ScSZ anode were approximated by adjusting the gas composition to correspond to that in the downstream region of an SOFC stack. At Uf = 80%, and with a cell voltage of 0.5 V, the ohmic resistance fluctuated slightly from the early stages of operation, and became much more significant after 80 h. High current density and large polarization were found to promote Ni agglomeration, leading to insufficient connectivity of the Ni nanoparticles. At Uf = 95%, and with a cell voltage of 0.6 V, fluctuations in the polarization were observed at a much earlier stage, which are attributed to the highly humidified fuel. In particular, significant degradation was observed when the compensated anode potential (which incorporates the anode ohmic losses) approached the Ni oxidation potential. Ohmic losses in the anode are considered to influence Ni oxidation by exposing Ni near the electrolyte to a more oxidizing atmosphere with the increase in oxygen ion transport. Stable operation is therefore possible under conditions in which the compensated anode potential does not approach the Ni oxidation potential, assuming a stable interconnected Ni network.

  • Item type:Article
    ID code:85296
    Dates:
    Date
    Event
    5 April 2019
    Published
    14 March 2019
    Published Online
    19 February 2019
    Accepted
    Notes:Funding Information: This research was supported by the NEDO project “Technology development for SOFC commercialization promotion. Basic study on rapid evaluation method of SOFC durability.” The initial stage of this study was partly supported by the Center of Innovation Program of the Japan Science and Technology Agency (JST) . Publisher Copyright: © 2019 Hydrogen Energy Publications LLC Tatsuya Kawasaki, Junko Matsuda, Yuya Tachikawa, Stephen Matthew Lyth, Yusuke Shiratori, Shunsuke Taniguchi, Kazunari Sasaki, Oxidation-induced degradation and performance fluctuation of solid oxide fuel cell Ni anodes under simulated high fuel utilization conditions, International Journal of Hydrogen Energy, Volume 44, Issue 18, 2019, Pages 9386-9399, https://doi.org/10.1016/j.ijhydene.2019.02.136.
    Subjects:Science > Chemistry
    Department:Faculty of Engineering > Chemical and Process Engineering
    Depositing user: Pure Administrator
    Date deposited:27 Apr 2023 10:57
    Last modified:09 Apr 2024 04:04
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/85296
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