Journal
JOURNAL OF POWER SOURCES
Volume 439, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227093
Keywords
Proton ceramic; Electrolysis; Intermediate temperature
Funding
- U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy (EERE) under the Fuel Cell Technologies Office [DE-EE0008428]
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The present work describes a doping strategy to improve the electrochemical performance of BaCe(Zr)O-3-based reversible protonic ceramic electrochemical cells (RePCECs). BaCe0.7Zr0.1Y0.2-xSmxO3-delta (0 <= x <= 0.2) synthesized by a solid-state reactive sintering method. Enhanced sintering with Sm-doping is observed with a significant increase of grain size as compared to un-doped samples. The improvement of the proton conductivity by proper Sm-doping is also achieved. This work fabricates and tests an electrochemical cell with a 25 mu m thick electrolyte in both protonic ceramic fuel cell (PCFC) and protonic ceramic electrolysis cell (PCEC) operation modes. At the intermediate temperature of 600 degrees C, a maximum power density of 410 mWcm(-2) is observed in PCFC mode under Air/H-2 gradient, while a current density of 370 mAcm(-2) is obtained with an applied voltage of 1.3 V in PCEC mode using 12 vol% H2O humidified air as feed gas and 5% H2 as sweep gas.
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