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Pr2BaNiMnO7−δ double-layered Ruddlesden–Popper perovskite oxides as efficient cathode electrocatalysts for low temperature proton conducting solid oxide fuel cells

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Abstract

The performance of low-temperature solid-oxide fuel cells (LT-SOFCs) is heavily dependent on the electrocatalytic activity of the cathode toward the oxygen reduction reaction (ORR). To overcome the obstacles of the poor activity and stability of traditional cathode materials, a Pr2BaNiMnO7−δ double-layered Ruddlesden–Popper structural oxide was developed that exhibits high ORR activity, exceptional low-temperature cell performance, long-term stability, and excellent chemical compatability with a BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb) proton-conducting electrolyte. When Pr2BaNiMnO7−δ is used as the cathode electrocatalyst for BZCYYb-based SOFCs, it demonstrates a peak power density of 1070 mW cm−2 at 700 °C with excellent stability under 0.7 V after 100 h of discharging. Even at 500 and 400 °C, the peak power densities still reach 259 and 135 mW cm−2, respectively. The area-specific polarization resistance of this cell is 0.084 Ω cm2 at 700 °C under open-circuit voltage (OCV) conditions. Interestingly, the activation energy (Ea) of the polarization resistance derived from the assembled single cell is lower than that in the reported literature, corresponding to a value of 0.96 eV. The excellent performance is higher than those of the state-of-the-art Ruddlesden–Popper structure materials used as cathode electrocatalysts for LT-SOFCs. Thus, these results suggest that the double-layered Ruddlesden–Popper perovskite oxide Pr2BaNiMnO7−δ is a preeminent highly active low-temperature cathode material.

Graphical abstract: Pr2BaNiMnO7−δ double-layered Ruddlesden–Popper perovskite oxides as efficient cathode electrocatalysts for low temperature proton conducting solid oxide fuel cells

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Supplementary files

Article information


Submitted
11 Oct 2019
Accepted
24 Dec 2019
First published
25 Dec 2019

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Pr2BaNiMnO7−δ double-layered Ruddlesden–Popper perovskite oxides as efficient cathode electrocatalysts for low temperature proton conducting solid oxide fuel cells

Q. Wang, J. Hou, Y. Fan, X. Xi, J. Li, Y. Lu, G. Huo, L. Shao, X. Fu and J. Luo, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA11212J

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