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

Autor: Wei Tang, Hanping Ding, Wenjuan Bian, Clarita Y. Regalado Vera, Joshua Y. Gomez, Yanhao Dong, Ju Li, Wei Wu, WeiWei Fan, Meng Zhou, Colin Gore, Bryan M. Blackburn, Hongmei Luo, Dong Ding
Rok vydání: 2022
Předmět:
Zdroj: Small. 18:2201953
ISSN: 1613-6829
1613-6810
DOI: 10.1002/smll.202201953
Popis: 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
Databáze: OpenAIRE
Externí odkaz: