期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 165, 期 13, 页码 F1098-F1102出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0821813jes
关键词
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资金
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20173020032120]
- Mid-career Researcher Program through the National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [NRF 2018R1A2A1A05077532]
- Global Ph.D. Fellowship Program through NRF Grant - Korean Government [NRF-2018H1A2A1060644]
Protonic ceramic fuel cells (PCFCs) are attractive energy conversion systems at intermediate operating temperatures (500-650 degrees C) because of the low activation energy for proton conduction. Despite this advantage, the efficient operation of PCFCs is still limited partly due to the large cathodic polarization resistance. To decrease the large cathodic polarization, the modification of cathode microstructure could be an effective way because the PCFC cathode microstructure requires both sufficient pathways for oxygen supply and water vapor removal, along with a large surface area for electrochemical reactions. Herein, the correlation between the cathode microstructure and the electrochemical performance is investigated based on BaZr0.1Ce0.7Y0.1Yb0.1O3-delta (BZCYYb) electrolyte under the PCFC operating condition at 650 degrees C. Four cells with PrBa0.5Sr0.5Co1.5Fe0.5O5-delta (PBSCF) cathode of different porosity with identical anode/electrolyte configuration were fabricated and tested. Interestingly, the modification of cathode porosity effectively decreases the cathodic polarization resistance from 0.077 to 0.048 Omega cm(2) at 650 degrees C, and the corresponding maximum power density of PCFCs is improved from 1.23 to 1.62 W cm(-2). The influence of other microstructural factors such as grain size, specific surface area (per volume), and porosity in the cathode should be studied to fully understand the impacts of microstructure on the cathode performance of PCFC. (c) 2018 The Electrochemical Society.
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