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An Efficient Bifunctional Air Electrode for Reversible Protonic Ceramic Electrochemical Cells |
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| Authors: | Yucun Zhou Weilin Zhang Nicholas Kane Zheyu Luo Kai Pei Kotaro Sasaki YongMan Choi Yu Chen Dong Ding Meilin Liu |
| Affiliation: | 1. School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology, Atlanta, GA, 30332-0245 USA;2. School of Environment and Energy, South China University of Technology, 382 East Road, Higher Education Mega Center, Guangzhou, 510006 P. R. China;3. Chemistry Department, Brookhaven National Laboratory, Upton, NY, 11973 USA;4. College of Photonics, National Yang Ming Chiao Tung University, Tainan, 71150 Taiwan;5. Energy & Environmental Science and Technology, Idaho National Laboratory, Idaho Falls, ID, 83415 USA |
| Abstract: | One of the main bottlenecks that limit the performance of reversible protonic ceramic electrochemical cells (R-PCECs) is the sluggish kinetics of the oxygen reduction and evolution reactions (ORR and OER). Here, the significantly enhanced ORR and OER kinetics and stability of a conventional La0.6Sr0.4Co0.2Fe0.8O3–δ (LSCF) air electrode by an efficient catalyst coating of barium cobaltite (BCO) is reported. The polarization resistance of a BCO-coated LSCF air electrode at 600 ° C is 0.16 Ω cm2, about 30% of that of the bare LSCF air electrode under the same conditions. Further, an R-PCEC with the BCO-coated LSCF air electrode shows exceptional performance in both fuel cell (peak power density of 1.16 W cm?2 at 600 ° C) and electrolysis (current density of 1.80 A cm?2 at 600 ° C at 1.3 V) modes. The performance enhancement is attributed mainly to the facilitated rate of oxygen surface exchange. |
| Keywords: | air electrodes oxygen evolution reaction oxygen reduction reaction protonic ceramic electrochemical cells water electrolysis |
