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Issue 2, 2019
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Electron doping of Sr2FeMoO6−δ as high performance anode materials for solid oxide fuel cells

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Abstract

Electron doping in perovskites is an effective approach to design and tailor the structure and property of materials. In A2BB′O6−δ-type double perovskites, B-site cation order can be tunable by A-site modification, potentially leading to significant effect on the oxygen nonstoichiometry of the compounds. La3+-doped Sr2FeMoO6−δ (Sr2−xLaxFeMoO6−δ, SLFM with 0 ≤ x ≤ 1) double perovskites have been designed and characterized systematically in this study as anode materials for solid oxide fuel cells. Rietveld refinement of powder X-ray diffraction reveals a crystalline symmetry transition of SLFM from tetragonal to orthorhombic with the increase of La content, driven by the extra electron onto the antibonding orbitals of eg and t2g of Fe/Mo cations. An increase in Fe/Mo anti-site defect accompanies this phase transition. Solid oxide fuel cells incorporating the Sr1.8La0.2FeMoO6−δ (SLFM2) anode demonstrate impressive power outputs and stable performance under direct CH4 operation because of its altered electronic structure, desired oxygen vacancy concentration and enhanced reducibility. Density functional theory plus U correction calculations provide an insight into how La doping affects the Fe/Mo anti-site defects and consequently the oxygen transport dynamics.

Graphical abstract: Electron doping of Sr2FeMoO6−δ as high performance anode materials for solid oxide fuel cells

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Supplementary files

Article information


Submitted
19 Oct 2018
Accepted
09 Dec 2018
First published
11 Dec 2018

J. Mater. Chem. A, 2019,7, 733-743
Article type
Paper
Author version available

Electron doping of Sr2FeMoO6−δ as high performance anode materials for solid oxide fuel cells

X. Yang, J. Chen, D. Panthi, B. Niu, L. Lei, Z. Yuan, Y. Du, Y. Li, F. Chen and T. He, J. Mater. Chem. A, 2019, 7, 733
DOI: 10.1039/C8TA10061F

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