Ni-Doped Sr₂Fe_1.5Mo_0.5O_6-δ as Anode Materials for Solid Oxide Fuel Cells

Author(s)

Guoliang Xiao
Siwei Wang
Ye Lin, University of South Carolina - ColumbiaFollow
Zhibin Yang
Minfang Han, University of South Carolina - Columbia
Fanglin Chen, University of South Carolina - ColumbiaFollow

Document Type

Article

Abstract

10% Ni-doped Sr₂Fe_1.5Mo_0.5O_6-δ with A-site deficiency is prepared to induce in situ precipitation of B-site metals under anode conditions in solid oxide fuel cells. XRD, SEM and TEM results show that a significant amount of nano-sized Ni-Fe alloy metal phase has precipitated out from Sr_1.9Fe_1.4Ni_0.1Mo_0.5O_6-δ upon reduction at 800^◦C in H₂. The conductivity of the reduced composite reaches 29 S cm⁻¹ at 800^◦C in H₂. Furthermore, fuel cell performance of the composite anode Sr_1.9Fe_1.4Ni_0.1Mo_0.5O_6-δ-SDC is investigated using H₂ as fuel and ambient air as oxidant with La_0.8Sr_0.2Ga_0.87Mg_0.13O₃ electrolyte and La_0.6Sr_0.4Co_0.2Fe_0.8O₃ cathode. The cell peak power density reaches 968 mW cm⁻² at 800^◦C and the voltage is relatively stable under a constant current load of 0.54 A cm⁻². After 5 redox cycles of the anode at 800^◦C, the fuel cell performance doesn’t suffer any degradation, indicating good redox stability of Sr_1.9Fe_1.4Ni_0.1Mo_0.5O_6-δ. Peak power density of 227 mW cm⁻² was also obtained when propane is used as fuel. These results indicate that a self-generated metal-ceramic composite can been successfully derived from Sr₂Fe_1.5Mo_0.5O_6-δ by compositional modifications and Sr_1.9Fe_1.4Ni_0.1Mo_0.5O_6-δ is a very promising solid oxide fuel cell anode material with enhanced catalytic activity and inherited good redox stability from the parent ceramic material.

Publication Info

Published in Journal of The Electrochemical Society, Volume 151, Issue 3, 2014, pages F805-F810.

Rights

©Journal of The Electrochemical Society 2014, The Electrochemical Society.

© The Electrochemical Society, Inc. 2014. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in the Journal of The Electrochemical Society.

Publisher’s Version: http://dx.doi.org/10.1149/2.061403jes

Xiao, G., Wang, S., Lin, Y., Yang, Z., Han, M., & Chen, F. (1 January 2014). Ni-Doped Sr₂Fe_1.5Mo_0.5O_6-δ as Anode Materials for Solid Oxide Fuel Cells. Journal of The Electrochemical Society, 151 (3), F805 – F810. http://dx.doi.org/10.1149/2.061403jes