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Research Article | Open Access

New two-layer Ruddlesden-Popper cathode materials for protonic ceramics fuel cells

Yihan LING( ), Tianming GUO, Yangyang GUO, Yang YANG, Yunfeng TIAN, Xinxin WANG, Xuemei OU, Peizhong FENG
School of Materials Science and Physics, China University of Mining and Technology, Xuzhou 221116, China
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Abstract

New two-layer Ruddlesden-Popper (RP) oxide La0.25Sr2.75FeNiO7-δ (LSFN) in the combination of Sr3Fe2O7-δ and La3Ni2O7-δ was successfully synthesized and studied as the potential active single-phase and composite cathode for protonic ceramics fuel cells (PCFCs). LSFN with the tetragonal symmetrical structure (I4/mmm) is confirmed, and the co-existence of Fe3+/Fe4+ and Ni3+/Ni2+ couples is demonstrated by X-ray photoelectron spectrometer (XPS) analysis. The LSFN conductivity is apparently enhanced after Ni doping in Fe-site, and nearly three times those of Sr3Fe2O7-δ, which is directly related to the carrier concentration and conductor mechanism. Importantly, anode supported PCFCs using LSFN-BaZr0.1Ce0.7Y0.2O3-δ (LSFN-BZCY) composite cathode achieved high power density (426 mW·cm-2 at 650 ℃) and low electrode interface polarization resistance (0.26 Ω·cm2). Besides, distribution of relaxation time (DRT) function technology was further used to analyse the electrode polarization processes. The observed three peaks (P1, P2, and P3) separated by DRT shifted to the high frequency region with the decreasing temperature, suggesting that the charge transfer at the electrode-electrolyte interfaces becomes more difficult at reduced temperatures. Preliminary results demonstrate that new two-layer RP phase LSFN can be a promising cathode candidate for PCFCs.

Keywords

protonic ceramics fuel cells (PCFCs)Ruddlesden-Popper (RP) phasesingle-phase cathodedistribution of relaxation time (DRT) functioncharge transfer

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Journal of Advanced Ceramics
Volume 10 Issue 5,
October 2021
Pages 1052-1060
DOI: 10.1007/s40145-021-0488-8
Cite this article:
LING Y, GUO T, GUO Y, et al. New two-layer Ruddlesden-Popper cathode materials for protonic ceramics fuel cells. Journal of Advanced Ceramics, 2021, 10(5): 1052-1060. https://doi.org/10.1007/s40145-021-0488-8

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Received: 01 February 2021
Revised: 15 April 2021
Accepted: 27 April 2021
Published: 15 September 2021
© The Author(s) 2021

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