High-Performance and Durable Fuel Cells using Co/Sr-Free Fluorite-Based Mixed Conducting (Pr,Ce)O_(2-δ) Cathode

Han Gil Seo; Dong Hwan Kim; Jongsu SeoSeung Jin JeongJinwook KimHarry L. TullerJi-Won SonWooChul Jung

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High-Performance and Durable Fuel Cells using Co/Sr-Free Fluorite-Based Mixed Conducting (Pr,Ce)O_(2-δ) Cathode

机译：High-Performance and Durable Fuel Cells using Co/Sr-Free Fluorite-Based Mixed Conducting (Pr,Ce)O_(2-δ) Cathode

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A major challenge to overcome in demonstrating solid oxide fuel cells (SOFCs)to be suitable as efficient and environmentally friendly energy conversiondevices capable of addressing pressing clean energy and environmental needsis to surmount chemical and thermo-mechanical instabilities in their operationalphase. To date, perovskite-based mixed conducting cathodes, whichinclude inherent Co and Sr elements for enhanced reactivity and conductivity,have been intensively studied. These Co/Sr-based oxides, however, exhibitsevere thermochemical expansion and suffer from Sr surface segregation,ultimately degrading the electrode performance. Here, high-performance anddurable SOFCs are demonstrated by employing a Co/Sr-free fluorite-basedmixed conducting (Pr,Ce)O_(2-δ) (PCO) cathode eminently compatible withfluorite-based solid electrolytes. The nanocolumnar PCO electrode developedin this study provides not only a remarkable low level of electrode resistance(e.g., ≈0.05 Ω cm~2 at 600 ℃) but also exceptional long-term stability(e.g., a degradation rate 15 times slower compared to the state-of-the-artLa_(0.6)Sr_(0.4)CoO_(3-δ) perovskite). The competitive peak power densities of ananode-supported single cell with the PCO cathode are also successively achieved,recording a value of 0.92 W cm~(?2) at 600 ℃. These findings herald the developmentof new Co/Sr-free electrodes for SOFCs at intermediate temperatures.

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《Advanced energy materials》 |2022年第43期|2202101.1-2202101.11|共11页
作者
Han Gil Seo; Dong Hwan Kim; Jongsu SeoSeung Jin JeongJinwook KimHarry L. TullerJi-Won SonWooChul Jung;
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Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)Daejeon 34141, Republic of Korea, Department of Materials Science and EngineeringMassachusetts Institute of TechnologyCambridge, MA 02139, USA;

Energy Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul 02792, Republic of Korea, Department of Mechanical EngineeringKorea UniversitySeoul 02841, Republic of Korea;

Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)Daejeon 34141, Republic of KoreaDepartment of Materials Science and EngineeringMassachusetts Institute of TechnologyCambridge, MA 02139, USAEnergy Materials Research CenterKorea Institute of Science and Technology (KIST)Seoul 02792, Republic of Korea, Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL)Korea UniversitySeoul 02841, Republic of Korea;

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正文语种英语
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(Pr; Ce)O_2; Co/Sr-free mixed conducting oxides; nanocolumnar structures; oxygen reduction reaction; solid oxide fuel cells;

High-Performance and Durable Fuel Cells using Co/Sr-Free Fluorite-Based Mixed Conducting (Pr,Ce)O_(2-δ) Cathode

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