Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 1, Pages 607-621Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta11000k
Keywords
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Funding
- Mid-career Researcher and Next-generation Engineering Researchers Development Program through the National Research Foundation of Korea [NRF-2017R1A2A2A05069812, NRF-2019H1D8A2106002]
- Industrial Technology Innovation R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [20173010032290]
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The novel layered swedenborgite structure Y0.8Er0.2BaCo3.2Ga0.8O7+delta (YEBCG) catalyst shows excellent performance in high-performance SOFCs and RPCCs, including thermal stability, fast reaction rates, and outstanding power density.
To improve the thermal stability and intrinsically sluggish kinetics of oxygen electrode reactions in solid oxide fuel cells (SOFCs) and reversible protonic ceramic cells (RPCCs) at intermediate temperatures, a novel layered swedenborgite structure Y0.8Er0.2BaCo3.2Ga0.8O7+delta (YEBCG) catalyst is introduced as an alternative to perovskite materials that contain cobalt. The thermal expansion coefficient of YEBCG is 8.41 x 10(-6) K-1, which is relatively well matched to the state-of-the-art proton-conducting and oxygen-ion-conducting electrolytes. The chemical bulk diffusion and surface exchange coefficients of YEBCG are 7.12 x 10(-4) and 8.01 x 10(-3) cm(2) s(-1), respectively, at 650 degrees C, which leads to much faster action than with state-of-art perovskite structured materials at intermediate temperatures. The maximum power densities of YEBCG cells are notably high, reaching 0.77 and 0.83 W cm(-2) at 650 degrees C in SOFC and protonic ceramic fuel cell modes, respectively. Under electrolysis, the YEBCG cells achieve outstanding current densities of -0.61 and -4.42 A cm(-2) at 500 and 700 degrees C, respectively, under an applied voltage of 1.4 V. Furthermore, the RPCC with YEBCG present no degradation over an entire 1000 h in fuel cell and electrolysis cell modes. These results demonstrate the excellent properties, including good durability, of the YEBCG air electrode when used in high performance SOFCs and RPCCs.
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