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A novel in-situ diffusion strategy to fabricate high performance cathode for low temperature proton-conducting solid oxide fuel cells

Abstract

Developing new low-cost high-performance cobalt-free cathode materials for low temperature proton-conducting solid oxide fuel cells (H-SOFC) has been an imperative topic. In response to this challenge, we herein develop a novel in-situ Pr diffusion strategy based on Sm0.2Ce0.8O2-δ-Pr(Pr0.5Ba1.5)Cu3O7-δ (SDC-PBCu, 3:7 wt.%) compound, to achieve a perovskite-related proton-blocking composite cathode (PBCC) Ce1-xPrxO2-δ-Ba2CeCu3O7.4-Sm2Ba1.33Ce0.67Cu3O9-CuO (PDC-BCC-SBCC-CuO) for BaZr0.1Ce0.7Y0.2O3-δ-based H-SOFC. The single cell achieves a remarkable performance with the maximum power density (MPD) of 1000 and 566 mW cm-2, corresponding to the interfacial polarization resistance (RP) of 0.037 and 0.188 Ω cm2 at 700 and 600 °C, respectively. The XRD results demonstrate that the PBCu phase disappear after the calcination of the mixed SDC-PBCu composite powder at 900 °C, with the formation of four new phases including fluorite structured PDC, orthorhombic layered material BCC, tetragonal perovskite-related SBCC and a small quantity of metallic oxide CuO, being favorable for a superior cathode performance. The ascendant electrochemical performance including the very high MPD and the lower RP obtained here indicate that the quaternary cobalt-free PBCC PDC-BCC-SBCC-CuO is a preferable alternative for high-performance low-temperature H-SOFC.

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Publication details

The article was received on 26 Jan 2018, accepted on 22 Apr 2018 and first published on 24 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA00859K
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    A novel in-situ diffusion strategy to fabricate high performance cathode for low temperature proton-conducting solid oxide fuel cells

    J. Hou, L. Miao, J. Hui, L. Bi, W. Liu and J. Irvine, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00859K

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