Enhanced ionic conductivity and suppressed electronic conductivity of an Al- and Mn-added ceria solid electrolyte
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Gd-doped ceria (GDC) is a promising solid electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) due toits high oxygen-ion conductivity. However, commercialization is limited due to high grain boundary resistance and electronicconduction in reduced conditions. In this work, Al- and Mn-added GDCs were designed to overcome their weaknesses. GDCand Al- and Mn-added GDC powders were prepared using spray pyrolysis and then sintered using spark plasma sinteringtechnique to obtain dense ceramic pellets. Additives enhanced the sinterability of the ceria leading to an increase in ionicconduction. More importantly, electronic conduction in GDC with the additives was suppressed under reduced conditions. This demonstrates that Al- and Mn-added GDC is a possible candidate as a solid electrolyte for IT-SOFCs.
Abstract
Gd-doped ceria (GDC) is a promising solid electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCs) due toits high oxygen-ion conductivity. However, commercialization is limited due to high grain boundary resistance and electronicconduction in reduced conditions. In this work, Al- and Mn-added GDCs were designed to overcome their weaknesses. GDCand Al- and Mn-added GDC powders were prepared using spray pyrolysis and then sintered using spark plasma sinteringtechnique to obtain dense ceramic pellets. Additives enhanced the sinterability of the ceria leading to an increase in ionicconduction. More importantly, electronic conduction in GDC with the additives was suppressed under reduced conditions. This demonstrates that Al- and Mn-added GDC is a possible candidate as a solid electrolyte for IT-SOFCs.
참고문헌 (20)
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