BaCo0.6Fe0.3Sn0.1O3-δ perovskite as a new superior oxygen reduction electrode for intermediate-to-low temperature solid oxide fuel cells
MetadataShow full item record
BaCo0.6Fe0.3Sn0.1O3−δ (BCFSn631) is evaluated as an oxygen reduction electrode for intermediate-to-low temperature solid oxide fuel cells (SOFCs). XRD and HR-TEM analysis demonstrate that it is in a simple perovskite phase with cubic lattice symmetry. In situ HT-XRD and ex situ XRD confirm the favorable phase stability of the oxide under a wide range of temperatures and atmospheric oxygen partial pressures. The oxygen nonstoichiometry, electrical conductivity, oxygen reduction activity and electrochemical performance of BCFSn631 are systematically studied through thermogravimetric analysis, electrical conductivity relaxation tests and electrochemical impedance analysis. It has a low thermal expansion coefficient of [similar] ~15.8 x 10−6 K−1 in a temperature range of 25–800 °C and a high oxygen vacancy concentration. Electric conductivity relaxation measurement demonstrates the high oxygen surface exchange and bulk diffusion properties of BCFSn631, comparable to that of the state-of-the-art Ba0.5Sr0.5Co0.8Fe0.2O3−δ electrode. Low area specific resistances are obtained for the BCFSn631 electrode in the intermediate temperature range, determined by electrochemical impedance spectroscopy based on symmetrical cell configuration, suggesting its high activity for oxygen reduction reaction. Peak power densities of 1168, 896, 523 and 273 mW cm−2 are obtained from a fuel cell with BCFSn631 electrode at 600, 550, 500 and 450 °C, respectively. In addition, good long-term performance stability is demonstrated. All these results highly promise BCFSn631 as an excellent oxygen reduction electrode for next generation SOFCs.
Showing items related by title, author, creator and subject.
Highly active and stable Er<inf>0.4</inf>Bi<inf>1.6</inf>O<inf>3</inf> decorated La<inf>0.76</inf>Sr<inf>0.19</inf>MnO<inf>3+: d</inf> nanostructured oxygen electrodes for reversible solid oxide cellsAi, N.; Li, N.; He, S.; Cheng, Y.; Saunders, M.; Chen, K.; Zhang, T.; Jiang, San Ping (2017)© 2017 The Royal Society of Chemistry. Bismuth based oxides have excellent ionic conductivity and fast oxygen surface kinetics and show promising potential as highly active electrode materials in solid oxide cells (SOCs) ...
Surprisingly high activity for oxygen reduction reaction of selected oxides lacking long oxygen-ion diffusion paths at intermediate temperatures: A case study of cobalt-free BaFeO3-δDong, F.; Chen, Y.; Chen, D.; Shao, Zongping (2014)The widespread application of solid oxide fuel cell technology requires the development of innovative electrodes with high activity for oxygen reduction reaction (ORR) at intermediate temperatures. Here, we demonstrate ...
Deactivation and Regeneration of Oxygen Reduction Reactivity on Double Perovskite Ba(2)Bi(0.1)Sc(0.2)Co(1.7)O(6-x) Cathode for Intermediate-Temperature Solid Oxide Fuel CellsZhou, W.; Sunarso, J.; Motuzas, J.; Liang, F.; Chen, Z.; Ge, L.; Liu, Shaomin; Julbe, A.; Zhu, Z. (2011)In situ high-temperature X-ray diffraction and thermal gravimetric−differential thermal analysis on room-temperature powder, as well as X-ray diffraction, Raman spectroscopy, and transmission electron microscopy on quenched ...