Journal
CHEMSUSCHEM
Volume 13, Issue 21, Pages 5671-5682Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202001503
Keywords
fuel cells; distribution function of relaxation times; electrochemistry; kinetics; water splitting
Funding
- Israel Science Foundation [938/15]
- Ministry of energy and water, Israel [217-11-028]
- Israel National Research Center for Electrochemical Propulsion (INREP)
- Technion-Israel Institute of Technology postdoctoral fellowship
- UConn-GTEP joint program
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Perovskite oxides are at the forefront of the race to develop catalysts/electrodes for fuel cells and electrolyzers. This work presents trifunctional properties of the double-perovskite oxide PrBa(0.5)Sr(0.5)Co(1.5)Fe(0.5)O(5+delta)and the PrBa0.5Sr0.5Co1.5Fe0.5O5+delta-Ag composite prepared by the glycine nitrate process. The electrocatalytic studies reveal that the Ag-based composite is an excellent catalyst for both oxygen evolution (OER) and hydrogen evolution reactions (HER) in alkaline solution. The electrochemical impedance spectroscopy analysis through distribution function of relaxation times (DFRT) suggests that the improved activity originates from the suppression of resistance contributed by various relaxation processes. The oxygen reduction reaction (ORR) kinetics in these oxide-based cathodes has been studied by performing symmetric-cell measurements at high temperatures using both oxygen-ion and proton-conducting cells. DC bias dependence of charge-transfer processes, oxygen-surface kinetics, polarization resistances, and activation energies are revealed by DFRT studies. Ag addition in PrBa(0.5)Sr(0.5)Co(1.5)Fe(0.5)O(5+delta)leads to enhanced kinetics of OER, HER, and ORR.
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