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Self-assembled cubic-hexagonal perovskite nanocomposite as intermediate-temperature solid oxide fuel cell cathode |
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| Affiliation: | 1. Division of Fuel Cells, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Shandong University of Science and Technology, 579 Qianwangang Road, 266590, China;1. Center for Fuel Cell Innovation, School of Materials Science and Engineering, State Key Lab of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan, 430062, China;3. Solid State Department, Physics, Division, National Research Centre, 33 El Bohouth st. (former El Tahrir st), P.O. 12622, Dokki, Giza, Egypt;1. Institute of Nuclear and New Energy Technology (INET), Collaborative Innovation Center of Advanced Nuclear Energy Technology, Tsinghua University, Beijing 100084, PR China;2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China;3. Department of Chemistry, Beijing Key Laboratory of Microanalytical Methods and Instrumentation, Tsinghua University, Beijing100084, PR China;4. NRC Energy, Mining & Environment, National Research Council of Canada, 4250 Wesbrook Mall, Vancouver, B.C., Canada V6T 1W5;5. College of Sciences/Institute for Sustainable Energy, Shanghai University, Shanghai 200444, PR China |
| Abstract: | Self-assembly is an emerging strategy for preparing composite cathodes with good oxygen electrochemical reduction activity and congenital chemical compatibility for intermediate-temperature solid oxide fuel cell (IT-SOFC). Here we report that a self-assembled BaCo0.6Zr0.4O3-δ (BZC-BC) nanocomposite is prepared through one-pot glycine-nitrate process and exhibits high cathode performance. The BZC-BC nanocomposite is composed of 62 mol% cubic perovskite BaZr0.82Co0.18O3-δ (BZC) as an ionic conductor and 38 mol% hexagonal perovskite BaCo0.96Zr0.04O2.6+δ (12H-BC) as a mixed ionic and electronic conductor. The BZC-BC nanocomposite has the pomegranate-like particles aggregated with a larger number of nanoparticles (50-100 nm) which greatly enlarge the three-phase boundary sites. The BZC-BC nanocomposite exhibits a thermal expansion coefficient of 12.89 × 10?6 K?1 well-matched with that of Ce0.8Gd0.2O3-δ (12.84 × 10?6 K?1) electrolyte. The high electro-catalytic activity of BZC-BC nanocomposite cathode for oxygen reduction is reflected by the low polarization resistances of oxygen ions incorporation at cathode/electrolyte interface (0.02823 Ω cm2), oxygen species diffusion (0.03702 Ω cm2) and oxygen adsorptive dissociation (0.07609 Ω cm2) at 700 °C. The single cell with BZC-BC nanocomposite cathode achieves the maximum power density of 1094 mW cm?2 at 650 °C and shows good stability under 25 h run. |
| Keywords: | Self-assembly Perovskites Nanocomposite Oxygen reduction reaction Intermediate temperature solid oxide fuel cells |
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