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An Unbalanced Battle in Excellence: Revealing Effect of Ni/Co Occupancy on Water Splitting and Oxygen Reduction Reactions in Triple–Conducting Oxides for Protonic Ceramic Electrochemical Cells

Journal Article · · Small
 [1];  [2];  [2];  [3];  [2];  [4];  [4];  [2];  [4];  [5];  [6];  [6];  [5];  [2]
  1. Idaho National Laboratory (INL), Idaho Falls, ID (United States); New Mexico State University, Las Cruces, NM (United States); Redox Power Systems
  2. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  3. Idaho National Laboratory (INL), Idaho Falls, ID (United States); New Mexico State University, Las Cruces, NM (United States)
  4. Massachusetts Institute of Technology, Cambridge, MA (United States)
  5. New Mexico State University, Las Cruces, NM (United States)
  6. Redox Power Systems, LLC, Beltsville, MD (United States)
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–δ 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 °C and also enables lower-temperature operations down to 350 °C, and superior long-term durability.
Research Organization:
Redox Power Systems, LLC, Beltsville, MD (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)
Grant/Contract Number:
AC07-05ID14517; EE0008835
OSTI ID:
2228913
Alternate ID(s):
OSTI ID: 1878240
Journal Information:
Small, Journal Name: Small Journal Issue: 30 Vol. 18; ISSN 1613-6810
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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