In:
Small, Wiley, Vol. 18, No. 30 ( 2022-07)
Abstract:
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 PrNi 0.7 Co 0.3 O 3− 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.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.202201953
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2168935-0
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