La and Al co-doped CaMnO3 perovskite oxides: From interplay of surface properties to anion exchange membrane fuel cell performance

Dzara, Michael J.; Christ, Jason M.; Joghee, Prabhuram; Ngo, Chilan; Cadigan, Christopher A.; Bender, Guido; Richards, Ryan M.; O'Hayre, Ryan; Pylypenko, Svitlana

doi:10.1016/j.jpowsour.2017.08.071

Title: La and Al co-doped CaMnO₃ perovskite oxides: From interplay of surface properties to anion exchange membrane fuel cell performance

Journal Article · 01 September 2017 · Journal of Power Sources

DOI: https://doi.org/10.1016/j.jpowsour.2017.08.071 · OSTI ID:1412828

Dzara, Michael J. ^[1]; Christ, Jason M. ^[2]; Joghee, Prabhuram ^[2];

^[1]; Cadigan, Christopher A. ^[1]; Bender, Guido ^[3]; Richards, Ryan M. ^[1]; O'Hayre, Ryan ^[1];

^[1]

Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States); Colorado School of Mines, Golden, CO (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

This work reports the first account of perovskite oxide and carbon composite oxygen reduction reaction (ORR) catalysts integrated into anion exchange membrane fuel cells (AEMFCs). Perovskite oxides with a theoretical stoichiometry of Ca_0.9La_0.1Al_0.1Mn_0.9O_3-δ are synthesized by an aerogel method and calcined at various temperatures, resulting in a set of materials with varied surface chemistry and surface area. Material composition is evaluated by X-ray diffraction, energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The perovskite oxide calcined at 800 degrees C shows the importance of balance between surface area, purity of the perovskite phase, and surface composition, resulting in the highest ORR mass activity when evaluated in rotating disk electrodes. Integration of this catalyst into AEMFCs reveals that the best AEMFC performance is obtained when using composites with 30:70 perovskite oxide:carbon composition. Doubling the loading leads to an increase in the power density from 30 to 76 mW cm^-2. The AEMFC prepared with a composite based on perovskite oxide and N-carbon achieves a power density of 44 mW cm^-2, demonstrating an ~50% increase when compared to the highest performing composite with undoped carbon at the same loading.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1412828

Report Number(s):: NREL/JA-5900-70170; TRN: US1800369

Journal Information:: Journal of Power Sources, Vol. 375, Issue C; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Title: La and Al co-doped CaMnO3 perovskite oxides: From interplay of surface properties to anion exchange membrane fuel cell performance

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Title: La and Al co-doped CaMnO₃ perovskite oxides: From interplay of surface properties to anion exchange membrane fuel cell performance