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A-Site Deficient Lanthanum Strontium Chromite Oxide with In-Situ Growth of Ni-Co Nano-Alloys: A Potential Electrode Catalyst for Solid Oxide Fuel Cell Open Access


Other title
A-Site Deficient Perovskite Oxide
In-Situ Exsolution
Solid Oxide Fuel Cell
Type of item
Degree grantor
University of Alberta
Author or creator
Supervisor and department
Luo,Jingli (Chemical and Materials Engineering)
Examining committee member and department
Etsell,Thomas H.(Chemical and Materials Engineering)
Luo,Jingli (Chemical and Materials Engineering)
Gupta,Rajender (Chemical and Materials Engineering)
Department of Chemical and Materials Engineering
Chemical Engineering
Date accepted
Graduation date
2017-06:Spring 2017
Master of Science
Degree level
Solid oxide fuel cell (SOFC) is an advanced power generation device that has desirable fuel flexibility and higher efficiency compared to conventional electricity generators. Since SOFC requires different fuel gases for reactions, a catalytically active fuel electrode with excellent stability as well as good carbon deposition resistance is the real challenge for the cell. In this research, the in-situ exsolved bimetallic doped A-site deficient perovskite oxide: A-site deficient nickel (Ni) and cobalt (Co) bimetallic doped lanthanum strontium chromite oxide (LSC) has been fabricated as a potential fuel electrode for SOFC. The in-situ exsolution process of Ni-Co alloy has been elaborately studied from various aspects. The electrochemical performances of Ni-Co doped LSC are thoroughly compared with Ni doped LSC in hydrogen gas, syngas as the anode and in CO2 gas as the cathode. The fuel cell with a bimetallic doped LSC anode has shown maximum power densities of 329 mW/cm2 in hydrogen and 258 mW/cm2 in syngas compared with only 237mW/cm2 in hydrogen and 170 mW/cm2 in syngas for the fuel cell with the single metallic doped anode at 850℃. The Ni-Co doped electrode also has shown higher optimum operating voltage and better stability than the Ni doped electrode in cathode function. Ni-Co doped cells have demonstrated no obvious degradation during long-term operation as well as good carbon deposition resistance under the tested atmosphere. It can be postulated that the existence of A-site deficiency helps the formation of oxygen vacancies as well as enhances the reducibility of B-site ions. Meanwhile, the synergistic effect between Co and Ni has changed the reduction behavior of Ni particles that increased its reducibility and promoted its electrochemical performances as well as the carbon deposition resistance.
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