A composite cathode with undoped LaFeO3 for protonic ceramic fuel cells. (15th June 2016)

• Record Type: Journal Article
• Authors: Choi, Jaewon; Kim, Baek; Song, Sang-Hyun; Park, Jong-Sung
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 22(2016)
• Page Start: 9619
• Page End: 9626
• Publication Date: 2016-06-15
• Subjects: Protonic ceramic fuel cells -- Composite cathode -- Oxygen-ion conductivity -- LaFeO3; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.03.115
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A composite cathode for protonic ceramic fuel cells was developed using undoped, electronically conductive LaFeO3 (LF) and proton conductive Ba(Ce0.51 Zr0.3 Y0.15 Zn0.04 )O3−δ (BCZY). A comparison of the cathodic performance of Sr-doped LaFeO3 (LSF), a material with both electronic and oxygen-ion conductivity, with that of the undoped LF revealed the effect of oxygen-ion conductivity on the cathodic performance in protonic ceramic fuel cells (PCFCs). The cathodic performances of the LF/BCZY and LSF/BCZY composites were similar; this implied that the oxygen-ion conductivity had a minimal contribution toward the cathodic performance in PCFCs, unlike the case with oxygen-ion conducting fuel cells. Based on these results, an alternative electrochemical reaction mechanism was proposed for producing water at the cathode using protons and oxygen. Highlights: LaFeO3 without oxygen ion conductivity was applied to the composite cathode of PCFCs. LaFeO3 cathode showed the identical performance to (La, Sr)FeO3 with O −2 conductivity. The possible cathode reaction mechanism including the hydroxyl ion is suggested.