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Catalysts 2019, 9(3), 269; https://doi.org/10.3390/catal9030269

Fabrication and Electrochemical Performance of Zn-Doped La0.2Sr0.25Ca0.45TiO3 Infiltrated with Nickel-CGO, Iron, and Cobalt as an Alternative Anode Material for Solid Oxide Fuel Cells

1
Technical University of Denmark, Department of Energy Conversion and Storage Frederiksborgvej 399, 4000 Roskilde, Denmark
2
Department of Chemistry, Allama Iqbal Open University, Islamabad 44000, Pakistan
*
Author to whom correspondence should be addressed.
Received: 25 December 2018 / Revised: 7 March 2019 / Accepted: 9 March 2019 / Published: 16 March 2019
(This article belongs to the Special Issue Solid Oxide Fuel Cells – The Low Temperature Challenge)
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Abstract

In solid oxide fuel cells, doped strontium titinates have been widely studied as anode materials due to their high n-type conductivity. They are used as current conducting backbones as an alternative to nickel-cermets, which suffer degradation due to coking, sulphur poisoning, and low tolerance to redox cycling. In this work, anode backbone materials were synthesized from La0.2Sr0.25Ca0.45TiO3−δ (LSCTA-), modified with 5 wt.% Zn, and infiltrated with nickel (Ni)/ceria gadolinium-doped cerium oxide (CGO), Fe, and Co. The electrodes were further studied for their electrochemical performance using electrochemical impedance spectroscopy (EIS) at open circuit voltage (OCV) in different hydrogen to steam ratios and at various operating temperatures (850–650 °C). Infiltration of electrocatalysts significantly reduced the polarization resistance and among the studied infiltrates, at all operating temperatures, Ni-CGO showed excellent electrode performance. The polarization resistances in 3% and 50% H2O/H2 atmosphere were found to be 0.072 and 0.025 Ω cm2, respectively, at 850 °C, and 0.091 and 0.076 Ω cm2, respectively, at 750 °C, with Ni-CGO. These values are approximately three orders of magnitude smaller than the polarization resistance (25 Ω cm2) of back bone material measured at 750 °C. View Full-Text
Keywords: perovskites; infiltration; electrochemical impedance; titinates; open circuit voltage perovskites; infiltration; electrochemical impedance; titinates; open circuit voltage
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Muzaffar, N.; Arshad, N.; Drasbæk, D.B.; Sudireddy, B.R.; Holtappels, P. Fabrication and Electrochemical Performance of Zn-Doped La0.2Sr0.25Ca0.45TiO3 Infiltrated with Nickel-CGO, Iron, and Cobalt as an Alternative Anode Material for Solid Oxide Fuel Cells. Catalysts 2019, 9, 269.

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