Evaluation of performance and durability of Ni-BZY cermet electrodes with BZY electrolyte

The performance of cermet anode of protonic ceramic fuel cells with BaZr0.8Y0.2O3-δ (BZY20) electrolyte has not been investigated sufficiently due to problems in ceramic processing and reference electrodes. In this study, the electrode performance of Ni-BZY20 cermet electrode with the BZY20 electrol...

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Bibliographic Details
Published in:Solid state ionics 2018-04, Vol.317, p.127-135
Main Authors: Onishi, Takayuki, Han, Donglin, Noda, Yohei, Hatada, Naoyuki, Majima, Masatoshi, Uda, Tetsuya
Format: Article
Language:English
Subjects:
Alternating current
Anodes
Barium
Barium Zirconate
Cermet anode
Cermets
Chemical compounds
Compressive properties
Conductivity
Durability
Electrodes
Electrolytic cells
Fuel cells
Iridium
Nickel
Nickel oxides
Organic chemistry
Proton conductor
Protonic ceramic fuel cells
Protons
Zirconium
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Summary:The performance of cermet anode of protonic ceramic fuel cells with BaZr0.8Y0.2O3-δ (BZY20) electrolyte has not been investigated sufficiently due to problems in ceramic processing and reference electrodes. In this study, the electrode performance of Ni-BZY20 cermet electrode with the BZY20 electrolyte was evaluated. Functionally symmetrical cells with the BZY20 electrolyte and Ni-BZY20 electrodes were fabricated with initial NiO content of 20–70 wt%. It is shown that hydration of BZY20 should be carried out at higher temperature to alleviate compressive stress in the electrolyte induced by chemical expansion of BZY20. IR resistance and electrode resistance of the cells were evaluated by current interruption and AC impedance measurements. The electrode resistance of the Ni-BZY20 anode containing 40–70 wt% NiO was 0.14–0.2 Ω cm−2 at 600 °C, and almost independent on NiO composition. Excellent durability of Ni-BZY20 supporting electrode in fuel cell mode was also demonstrated with La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode. The electrode resistance of the cell showed almost no degradation through the operation at cell voltage of 0.8 V for 2000 h. •The performance of Ni-BZY cermet electrodes with BZY electrolyte were evaluated.•The appropriate condition for hydration and reduction of the cell was established.•The optimal composition range of Ni in the cermet electrode is determined.•The durability of Ni-BZY cermet electrode was demonstrated in fuel cell mode.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2018.01.015