Mechanism for Major Improvement in SOFC Electrolyte Conductivity When Using Lithium Compounds as Anode

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-05-26
Major/Subject
Mcode
Degree programme
Language
en
Pages
5
4134-4138
Series
ACS Applied Energy Materials, Volume 3, issue 5
Abstract
Recent studies indicate that the electrolyte ionic conductivity in an SOFC can be considerably increased by using lithium compounds as the electrode. We found that the ionic conductivity of Gd0.1Ce0.9O1.95 electrolyte in the Ni0.8Co0.15Al0.05LiO2 anode cell was 10.1 mS/cm only at 550 °C without H2, but it increased to 44.6 mS/cm after feeding H2 to the anode. It was found that LiOH/Li2CO3 moved into the GDC electrolyte from the NCAL anode and formed a three-phase composite electrolyte. A space charge region with a high oxygen vacancy concentration is formed around the interface of LiOH/Li2CO3 and GDC, which increases the ionic conductivity.
Description
Keywords
anode, ionic conductivity, LiCO, LiOH, NiCoAlLiO, solid oxide fuel cell, space charge
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Citation
He, Y, Chen, G, Zhang, X, Zhang, L, Yang, D, Asghar, M I, Geng, S & Lund, P D 2020, ' Mechanism for Major Improvement in SOFC Electrolyte Conductivity When Using Lithium Compounds as Anode ', ACS Applied Energy Materials, vol. 3, no. 5, pp. 4134-4138 . https://doi.org/10.1021/acsaem.0c00364