Research output: Contribution to journal › Article › peer-review
Jie Hou, Lina Miao, Jianing Hui, Lei Bi, Wei Liu, John T.S. Irvine
Developing new low-cost high-performance cobalt-free cathode materials for low temperature proton-conducting solid oxide fuel cells (H-SOFCs) has been an imperative topic. In response to this challenge, we herein develop a novel in situ Pr diffusion strategy based on a 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-SOFCs. The single cell achieves a remarkable performance with a 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 disappears 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-SOFCs.
Original language | English |
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Pages (from-to) | 10411-10420 |
Number of pages | 10 |
Journal | Journal of Materials Chemistry A |
Volume | 6 |
Issue number | 22 |
Early online date | 24 Apr 2018 |
DOIs | |
Publication status | Published - 14 Jun 2018 |
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Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
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