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Characterization and polarization DRT analysis of a stable and highly active proton-conducting cathode

The development of high active cathode materials owning low activation energy (Ea) is the most critical core for protonic solid oxide fuel cells (P-SOFCs). Considering this challenge, we herein develop Ba0.9La0.1Co0.4Fe0.4Zr0.1Y0.1O3-?-BaZr0.1Ce0.7Y0.2O3-? (BLCFZY-BZCY) composite as a new proton conducting cathode for P-SOFCs. Anode supported single cells with BLCFZY-BZCY cathode show remarkable performance and low electrode Ea of 83.41?kJ?mol?1. High power densities of 752 and 206?mW?cm?2 are achieved at 700 and 500?°C, respectively, while corresponding electrode interfacial polarization resistances (Rp) are 0.08 and 1.2???cm2. Interestingly, the electrode polarization processes with a high resolution based on the impedance spectra data were further analyzed using the distribution function of relaxation time (DRT). Three same polarization peaks (P1, P2, P3) meaning three rate-limiting steps are existed in the DRT curves with different temperature, where P3 resulting from the cathode-electrolyte interfacial resistance with oxygen species involved reactions is the dominant rate-limiting step with a proportion of over 49.6% while the anode-electrolyte interfacial resistance corresponding to P1 has almost no increase, from 0.03 ?cm2 to 0.09 ?cm2. The experimental results demonstrate BLCFZY-BZCY composite can be a promising proton conducting cathode for P-SOFCs.

» Author: Wei Cai, Yangyang Guo, Teng Zhang, Tianming Guo, Hui Chen, Bin Lin, Xuemei Ou, Yihan Ling

» Reference: 10.1016/j.ceramint.2018.05.035

» Publication Date: 15/08/2018

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