Tailoring an interstitial oxygen conducting electrode by in situ fabrication for quasi-symmetrical solid oxide fuel cell
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ORIGINAL PAPER
Tailoring an interstitial oxygen conducting electrode by in situ fabrication for quasi-symmetrical solid oxide fuel cells Xing Zhao 1,2 & Xue Yang 1,2 & Dong Tian 2 & Xiaoyong Lu 2 & Yanzhi Ding 2 & Yonghong Chen 2 & Hanxu Li 1,2 Received: 16 August 2020 / Revised: 16 September 2020 / Accepted: 18 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract With the aim to maintain the advantage of symmetrical solid oxide fuel cells (SSOFCs), quasi-SSOFC with the interstitial oxygen conducting electrode is fabricated by the in situ forming method. The in situ fabrication process is performed by reducing perovskite typed Pr1-xSrxFeO3-δ (x = 0.4 and 0.5) in hydrogen at 800 °C for 10 h. After the reduction treatment, Pr0.6Sr0.4FeO3-δ (PSF64) is decomposed to (Pr0.6Sr0.4)3Fe2O7, (Pr0.6Sr0.4)2FeO4, and Fe nanoparticles, while Pr0.5Sr0.5FeO3-δ (PSF55) is decomposed to (Pr0.6Sr0.4)2FeO4 and Fe nanoparticles. Results show that the formation of RP-typed layered structure (Pr0.6Sr0.4)3Fe2O7 in reducing atmosphere can accelerate the oxygen ion transport rate, which leads to the enhancement of Rp value from 0.36 to 0.16 Ω cm2 at 800 °C and the improvement of power density from 418 to 502 mW/cm2. It is believed that introducing the interstitial oxygen conducting electrode to a quasi-symmetrical oxide fuel cell is an efficient approach to enhance the performance. Keywords Interstitial oxygen conduction . Layered structure . Quasi-SSOFC . In situ fabrication
Introduction Symmetrical solid oxide fuel cells (SSOFCs), employing the same highly active materials as both cathode and anode, have attracted increasing attention as it can reverse the gas flow of electrodes to avoid the corresponding carbon deposition and sulfur poisoning caused by the using of hydrocarbon fuels [1–3]. In this configuration, the fabrication cost of cells can be considerably reduced because the fabrication process can be completed in one step. Besides, the compatibility between electrodes and electrolyte can be improved due to the only one interface existed in such configuration [4, 5]. But unfortunately, the requirements
* Yonghong Chen [email protected] * Hanxu Li [email protected] 1
School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China
2
School of Chemistry and Material Engineering, Anhui Province Key Laboratory of Low Temperature Co-Fired Material, Huainan Normal University, Huainan 232001, Anhui, People’s Republic of China
of electrode materials for SSOFCs are extremely strict, including mixed ionic and electronic conducting behavior, chemical and thermal compatibility with electrolyte and redox stable. In addition, the symmetrical electrode materials should exhibit high catalytic activity towards oxygen reduction reaction and fuel oxidation reaction [2, 6]. La0.75Sr0.25Cr0.5Mn0.5O3 was the first material used as a symmetrical electrode for SSOFCs, which shows a good redox stable property and excellent electrochemical performance [1]. These at
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