Journal
SMALL
Volume 18, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202201953
Keywords
oxygen reduction reaction; proton conduction; protonic ceramic electrochemical cells; triple-conducting oxide; water splitting
Categories
Funding
- HydroGEN Advanced Water Splitting Materials Consortium, established as part of the Energy Materials Network under the U.S. Department of Energy (USDOE), the Office of Energy Efficiency and Renewable Energy (EERE), the Hydrogen and Fuel Cell Technologies Of [DE-AC07-05ID14517, DE-EE0008835]
- National Science Foundation [OIA-2119688]
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By engineering non-equivalent B-site Ni/Co occupancy in praseodymium cobaltite perovskite, this work promotes triple conduction by facilitating proton conduction, replacing conventional electrodes with sluggish kinetics in protonic ceramic electrochemical cells. Surface infrared spectroscopy is used to study the dehydration behavior and proves the existence of protons in the perovskite lattice. The increased nickel replacement on the B-site positively impacts proton defect stability, catalytic activity, and electrochemical performance, making it a promising pathway for increasing catalytic activity in oxygen reduction and water splitting reactions.
Porous electrodes that conduct electrons, protons, and oxygen ions with dramatically expanded catalytic active sites can replace conventional electrodes with sluggish kinetics in protonic ceramic electrochemical cells. In this work, a strategy is utilized to promote triple conduction by facilitating proton conduction in praseodymium cobaltite perovskite through engineering non-equivalent B-site Ni/Co occupancy. Surface infrared spectroscopy is used to study the dehydration behavior, which proves the existence of protons in the perovskite lattice. The proton mobility and proton stability are investigated by hydrogen/deuterium (H/D) isotope exchange and temperature-programmed desorption. It is observed that the increased nickel replacement on the B-site has a positive impact on proton defect stability, catalytic activity, and electrochemical performance. This doping strategy is demonstrated to be a promising pathway to increase catalytic activity toward the oxygen reduction and water splitting reactions. The chosen PrNi0.7Co0.3O3-delta oxygen electrode demonstrates excellent full-cell performance with high electrolysis current density of -1.48 A cm(-2) at 1.3 V and a peak fuel-cell power density of 0.95 W cm(-2) at 600 degrees C and also enables lower-temperature operations down to 350 degrees C, and superior long-term durability.
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